axon_frontend/

ast.rs

//! AXON AST node definitions — direct port of axon/compiler/ast_nodes.py.
//!
//! Tier 1 constructs have fully typed structs.
//! Tier 2+ constructs use `GenericDeclaration` (structural fallback).

#![allow(dead_code)]

use crate::tokens::Trivia;

// ── Location helper ──────────────────────────────────────────────────────────

/// Source location shared by all AST nodes.
#[derive(Debug, Clone, Default)]
pub struct Loc {
    pub line: u32,
    pub column: u32,
}

// ── Trivia channel (v1.5.2 — Lossless lexing) ─────────────────────────────
//
// The Python AST attaches `leading_trivia` / `trailing_trivia` directly
// to each ASTNode (97+ subclasses inherit empty defaults). The Rust
// structs do not have inheritance, so adding two `Vec<Trivia>` fields
// to every node would require touching each of the 97 structs and
// every fixture test that constructs them — high mechanical churn for
// a use case (LSP / formatter / doc gen) that can be served just as
// well by indexing trivia by declaration position.
//
// `DeclarationTrivia` is a side-channel attached to `Program`. The
// parser populates it in lockstep with `declarations` so consumer code
// can do `program.declaration_trivia[i]` to get the leading/trailing
// trivia of `program.declarations[i]`. This preserves the AST shape
// (no breaking changes), keeps `IRProgram` JSON byte-identical with
// the Python reference (trivia is never serialised), and ships the
// adopter-reported feature end-to-end.
//
// If a future sub-phase wants per-node trivia inside the AST itself
// (mirror of the Python ASTNode shape), this side-channel is the seed:
// every `DeclarationTrivia` already carries the data; spreading it
// into the structs is a mechanical refactor at that point.

/// Comments attached to a single top-level declaration. Indexed
/// in parallel with `Program.declarations`.
#[derive(Debug, Clone, Default)]
pub struct DeclarationTrivia {
    /// Comment trivia that appeared before the declaration's first
    /// token (since the previous declaration or file start).
    pub leading: Vec<Trivia>,
    /// Comment trivia on the same line as the declaration's last
    /// effective token, before the next newline.
    pub trailing: Vec<Trivia>,
}

// ── Top-level ────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct Program {
    pub declarations: Vec<Declaration>,
    /// v1.5.2 — comment trivia attached per declaration (parallel
    /// with `declarations`). Empty by default; populated by the parser
    /// when source carries comments. Defaults preserve every existing
    /// `Program { declarations, loc }` constructor — `..Default::default()`
    /// on a `Program` literal fills in the new field.
    pub declaration_trivia: Vec<DeclarationTrivia>,
    pub loc: Loc,
}

/// A single top-level declaration in an AXON program.
#[derive(Debug)]
pub enum Declaration {
    Import(ImportNode),
    Persona(PersonaDefinition),
    Context(ContextDefinition),
    Anchor(AnchorConstraint),
    Memory(MemoryDefinition),
    Tool(ToolDefinition),
    Type(TypeDefinition),
    Flow(FlowDefinition),
    /// v2.87.0 — `effect E { Op(p: T) -> R }`. A peer of `tool`, per
    /// `the design plan` section 3.1.
    Effect(EffectDefinition),
    Intent(IntentNode),
    Run(RunStatement),
    Epistemic(EpistemicBlock),
    Let(LetStatement),
    /// Lambda Data (ΛD) — Epistemic State Vector definition.
    LambdaData(LambdaDataDefinition),
    // ── Tier 2 declarations (full AST) ──
    Agent(AgentDefinition),
    Shield(ShieldDefinition),
    /// v4.5.0 — a signed determination, standing beside what was proved.
    Attest(AttestDefinition),
    /// v2.27.0 — a temporal execution-window guard.
    Window(WindowDefinition),
    /// v2.69.0 — a TOP-LEVEL `budget <Name> { … }`. Governs every flow that
    /// calls the tools its quotas name — not just a daemon's.
    Budget(BudgetBlock),
    Pix(PixDefinition),
    Ledger(LedgerDefinition),
    Psyche(PsycheDefinition),
    Corpus(CorpusDefinition),
    Dataspace(DataspaceDefinition),
    Ots(OtsDefinition),
    Mandate(MandateDefinition),
    Compute(ComputeDefinition),
    Daemon(DaemonDefinition),
    AxonStore(AxonStoreDefinition),
    AxonEndpoint(AxonEndpointDefinition),
    /// v2.5.0 — Closed-catalog extension mechanism. Declares
    /// adopter-specific PROVENANCE members for a closed catalog
    /// (`effects` bases or shield `scan` categories) so the
    /// type-checker + PCC treat them as first-class. Auditable +
    /// gateable; never extends the enforceable effect set (invariant
    /// #2 — provenance-class only).
    Extension(ExtensionDefinition),
    /// v1.1.0 — I/O cognitivo primitives.
    Resource(ResourceDefinition),
    Fabric(FabricDefinition),
    Manifest(ManifestDefinition),
    Observe(ObserveDefinition),
    /// v1.1.0 — Control cognitivo primitives.
    Reconcile(ReconcileDefinition),
    Lease(LeaseDefinition),
    Ensemble(EnsembleDefinition),
    /// v1.1.0 — Topology + π-calculus binary sessions.
    Session(SessionDefinition),
    Topology(TopologyDefinition),
    /// v1.1.0 — Cognitive immune system (per docs/paper_immune_v2.md).
    Immune(ImmuneDefinition),
    Reflex(ReflexDefinition),
    Heal(HealDefinition),
    /// v1.3.1 — UI cognitiva declarativa.
    Component(ComponentDefinition),
    View(ViewDefinition),
    /// v1.6.0 — Mobile typed channels (paper_mobile_channels.md).
    Channel(ChannelDefinition),
    /// v2.3.0 — typed WebSocket transport binding a `session` protocol
    /// (paper_websocket_cognitive_primitive.md).
    Socket(SocketDefinition),
    /// v2.37.0 — the dual transport role of `socket`: a persistent,
    /// config-resolved OUTBOUND connection to a third-party vendor, typed by
    /// the same v2.3.0 session algebra on the axon-facing side and transcoded
    /// to the vendor's wire frames by a declared total projection
    /// (the design plan).
    Upstream(UpstreamDefinition),
    /// v2.37.0 — the voice-agent simplicity layer: macro-expands
    /// (inspectable via `axon desugar`, the design decision) to `ots` + carrier
    /// `session`/`socket` + `upstream` legs. The declaration stays in the
    /// AST for provenance + v2.37.0 validation (T852); the IR carries only
    /// the expansion — sugar the compliance reviewer can always see through.
    Voice(VoiceDefinition),
    /// v2.38.0 — a named, referenced browser-origin policy (mirrors
    /// `shield`'s shape exactly), resolved per `axonendpoint.cors:`
    /// reference (the design plan).
    Cors(CorsDefinition),
    /// v2.40.0 — a named, referenced result-memoization policy (mirrors
    /// `cors`'s shape), resolved per `tool.cache:` / `retrieve.cache:`
    /// (the design plan).
    Cache(CacheDefinition),
    /// v2.42.0 — the long-horizon autonomous research primitive: a governed
    /// ORCHESTRATOR (not a monolith) that composes existing primitives
    /// (`memory`/`corpus`, `par`, `quant`, `forge`, `daemon`, the v2.28.0 budget,
    /// the v2.36.0 interruptible session, the v2.34.0 signed egress) into a
    /// budget-bounded, interruptible, fail-closed, provenance-witnessed
    /// research loop. Enterprise-exclusive at scale (charter split R1); the
    /// keyword + type discipline + ports live in OSS
    /// (the design plan).
    Savant(SavantDefinition),
    /// v2.42.0 — a dynamic tool-synthesis policy: the closed set of
    /// conditions (risk ceiling, source language, mandatory WASM zero-trust
    /// sandbox, Coder/Reviewer consensus) under which a `savant` may
    /// synthesise + execute a tool at runtime. The paper's "OTS = Ontological
    /// Tool Synthesis" grounded to a real keyword (`ots` already means
    /// one-shot media transform — paper section 9.1). OSS declares + statically
    /// disciplines the policy and ships a DENY-BY-DEFAULT reference; the real
    /// Extism/WASM executor is enterprise (v2.42.0).
    Synth(SynthDefinition),
    /// v2.43.0 — an authorization scope: the signed envelope (`targets`
    /// allowlist + `depth` ceiling + `approver`) a `warden` adversarial-analysis
    /// block MUST run `within`. The load-bearing safety construct that makes
    /// warden a governed auditor, not a weapon: no in-scope authorization ⇒ no
    /// analysis (fail-closed). Referenced by `warden(t) within <Scope>`
    /// (the design plan).
    Scope(ScopeDefinition),
    /// v2.46.0 — a named ephemeral-credential contract: TTL-bounded,
    /// capability-attenuated bearer minting (`authority_only_attenuates` —
    /// grants ⊆ the minter's own capabilities at mint, TTL ≤ the closed
    /// ceiling). Declared once (the `cors`/`scope` shape), referenced by the
    /// `mint <Credential> as <binding>` flow verb
    /// (the design plan).
    Credential(CredentialDefinition),
    /// v2.4.0 — a Pauli-sum observable `M = Σ cₖ Pₖ` that a `quant`
    /// block measures against (paper section 3.2; plan D5).
    Observable(ObservableDefinition),
    /// v2.23.0 — an Advantage Witness: a machine-checkable proof obligation
    /// that a primitive's `claim` beats a cheaper `baseline` by a `metric` above
    /// a `threshold` on real `data` (doctrine `axon://logic/no_unwitnessed_advantage`).
    Witness(WitnessDefinition),
    /// v2.53.0 — Native Document Synthesis: a declarative, compile-time-
    /// validated DOCX/PPTX/XLSX structure that is the point where a value LEAVES
    /// the epistemic lattice and becomes a human artifact. `target:` selects a
    /// serializer, not a capability (the design decision — identical effect rows). The
    /// assertion-laundering barrier refuses a value below `believe` in
    /// an assertive slot without an `attribute:` or a shield
    /// (the design plan).
    Document(DocumentDefinition),
    /// v2.60.0 — Governed CRM Delivery: a declarative, compile-time-validated
    /// egress of assertions into a system of record (a CRM). The dual of
    /// acquisition (`scrape`, v2.52.0): where `document` leaves the lattice into a
    /// human artifact, `deliver` leaves it into a machine system others treat as
    /// fact. The provenance-stripping barrier (the design decision, axon-T920) refuses a
    /// `provenance: cleared` delivery of an unshielded flow value — a guess must
    /// arrive labeled as a guess (the design plan).
    Deliver(DeliverDefinition),
    /// v2.66.0 — governed human notification.
    Notify(NotifyDefinition),
    /// Tier 3+ declarations parsed structurally (balanced braces, no detailed AST).
    Generic(GenericDeclaration),
}

/// v2.76.0 — the named surface of a declaration: `(name, kind, loc)`,
/// or `None` for the statement-like declarations that do not bind a
/// referenceable top-level name (`import` / `run` / `let` / the epistemic
/// block wrapper, whose body registers recursively).
///
/// # Parity contract
///
/// The `kind` strings here MUST match the kinds the type-checker's
/// `register_declarations` assigns (that is what `TypeChecker::lookup`
/// compares against when a `run` / reference names the symbol). The match
/// below is deliberately **exhaustive — no wildcard arm** — so adding a
/// `Declaration` variant without deciding its export surface is a compile
/// error, not a silent gap in the module system.
pub fn declaration_surface(decl: &Declaration) -> Option<(String, String, Loc)> {
    match decl {
        Declaration::Import(_)
        | Declaration::Run(_)
        | Declaration::Let(_)
        | Declaration::Epistemic(_) => None,
        Declaration::Persona(n) => Some((n.name.clone(), "persona".into(), n.loc.clone())),
        Declaration::Context(n) => Some((n.name.clone(), "context".into(), n.loc.clone())),
        Declaration::Anchor(n) => Some((n.name.clone(), "anchor".into(), n.loc.clone())),
        Declaration::Memory(n) => Some((n.name.clone(), "memory".into(), n.loc.clone())),
        Declaration::Tool(n) => Some((n.name.clone(), "tool".into(), n.loc.clone())),
        Declaration::Type(n) => Some((n.name.clone(), "type".into(), n.loc.clone())),
        Declaration::Flow(n) => Some((n.name.clone(), "flow".into(), n.loc.clone())),
        // v2.87.0 — an `effect` IS exportable. A module that declares one and
        // a flow in another module that handles it is the compositional case
        // the whole paradigm rests on; hiding it from the module surface would
        // make an effect usable only in the file that declares it.
        Declaration::Effect(n) => Some((n.name.clone(), "effect".into(), n.loc.clone())),
        Declaration::Intent(n) => Some((n.name.clone(), "intent".into(), n.loc.clone())),
        Declaration::LambdaData(n) => Some((n.name.clone(), "lambda_data".into(), n.loc.clone())),
        Declaration::Agent(n) => Some((n.name.clone(), "agent".into(), n.loc.clone())),
        Declaration::Shield(n) => Some((n.name.clone(), "shield".into(), n.loc.clone())),
        // v4.5.0 — an attestation is an exportable named symbol: a module that
        // owns the determination can be imported by the flow that relies on it.
        Declaration::Attest(n) => Some((n.name.clone(), "attest".into(), n.loc.clone())),
        Declaration::Window(n) => Some((n.name.clone(), "window".into(), n.loc.clone())),
        Declaration::Budget(n) => Some((n.name.clone(), "budget".into(), n.loc.clone())),
        Declaration::Pix(n) => Some((n.name.clone(), "pix".into(), n.loc.clone())),
        Declaration::Ledger(n) => Some((n.name.clone(), "ledger".into(), n.loc.clone())),
        Declaration::Psyche(n) => Some((n.name.clone(), "psyche".into(), n.loc.clone())),
        Declaration::Corpus(n) => Some((n.name.clone(), "corpus".into(), n.loc.clone())),
        Declaration::Dataspace(n) => Some((n.name.clone(), "dataspace".into(), n.loc.clone())),
        Declaration::Ots(n) => Some((n.name.clone(), "ots".into(), n.loc.clone())),
        Declaration::Mandate(n) => Some((n.name.clone(), "mandate".into(), n.loc.clone())),
        Declaration::Compute(n) => Some((n.name.clone(), "compute".into(), n.loc.clone())),
        Declaration::Daemon(n) => Some((n.name.clone(), "daemon".into(), n.loc.clone())),
        Declaration::AxonStore(n) => Some((n.name.clone(), "axonstore".into(), n.loc.clone())),
        Declaration::AxonEndpoint(n) => {
            Some((n.name.clone(), "axonendpoint".into(), n.loc.clone()))
        }
        Declaration::Extension(n) => Some((n.name.clone(), "extension".into(), n.loc.clone())),
        Declaration::Resource(n) => Some((n.name.clone(), "resource".into(), n.loc.clone())),
        Declaration::Fabric(n) => Some((n.name.clone(), "fabric".into(), n.loc.clone())),
        Declaration::Manifest(n) => Some((n.name.clone(), "manifest".into(), n.loc.clone())),
        Declaration::Observe(n) => Some((n.name.clone(), "observe".into(), n.loc.clone())),
        Declaration::Reconcile(n) => Some((n.name.clone(), "reconcile".into(), n.loc.clone())),
        Declaration::Lease(n) => Some((n.name.clone(), "lease".into(), n.loc.clone())),
        Declaration::Ensemble(n) => Some((n.name.clone(), "ensemble".into(), n.loc.clone())),
        Declaration::Session(n) => Some((n.name.clone(), "session".into(), n.loc.clone())),
        Declaration::Topology(n) => Some((n.name.clone(), "topology".into(), n.loc.clone())),
        Declaration::Immune(n) => Some((n.name.clone(), "immune".into(), n.loc.clone())),
        Declaration::Reflex(n) => Some((n.name.clone(), "reflex".into(), n.loc.clone())),
        Declaration::Heal(n) => Some((n.name.clone(), "heal".into(), n.loc.clone())),
        Declaration::Component(n) => Some((n.name.clone(), "component".into(), n.loc.clone())),
        Declaration::View(n) => Some((n.name.clone(), "view".into(), n.loc.clone())),
        Declaration::Channel(n) => Some((n.name.clone(), "channel".into(), n.loc.clone())),
        Declaration::Socket(n) => Some((n.name.clone(), "socket".into(), n.loc.clone())),
        Declaration::Upstream(n) => Some((n.name.clone(), "upstream".into(), n.loc.clone())),
        Declaration::Voice(n) => Some((n.name.clone(), "voice".into(), n.loc.clone())),
        Declaration::Cors(n) => Some((n.name.clone(), "cors".into(), n.loc.clone())),
        Declaration::Cache(n) => Some((n.name.clone(), "cache".into(), n.loc.clone())),
        Declaration::Savant(n) => Some((n.name.clone(), "savant".into(), n.loc.clone())),
        Declaration::Synth(n) => Some((n.name.clone(), "synth".into(), n.loc.clone())),
        Declaration::Scope(n) => Some((n.name.clone(), "scope".into(), n.loc.clone())),
        Declaration::Credential(n) => Some((n.name.clone(), "credential".into(), n.loc.clone())),
        Declaration::Observable(n) => Some((n.name.clone(), "observable".into(), n.loc.clone())),
        Declaration::Witness(n) => Some((n.name.clone(), "witness".into(), n.loc.clone())),
        Declaration::Document(n) => Some((n.name.clone(), "document".into(), n.loc.clone())),
        Declaration::Deliver(n) => Some((n.name.clone(), "deliver".into(), n.loc.clone())),
        Declaration::Notify(n) => Some((n.name.clone(), "notify".into(), n.loc.clone())),
        Declaration::Generic(n) => {
            if n.name.is_empty() {
                None
            } else {
                Some((n.name.clone(), n.keyword.clone(), n.loc.clone()))
            }
        }
    }
}

// ── v2.53.0 — Native Document Synthesis ─────────────────────────────────────

/// v2.53.0 — a declarative document. `target:` picks the serializer
/// (docx|pptx|xlsx); `provenance:` picks how the provenance part is emitted
/// (none|embedded|signed); `template:` names an enterprise template; `effects:`
/// carries the propagated `sensitive:`/`legal:` basis. `blocks` is the body —
/// a closed-catalog tree of [`DocBlock`]s whose vocabulary the checker validates
/// against `target` (a `slide` in a `docx` is `axon-T9xx`, the design decision).
#[derive(Debug, Default)]
pub struct DocumentDefinition {
    pub name: String,
    /// v4.4.0 — `payload: <Type>`: the DECLARED TYPE this document renders. κ is read from it: a regulated
    /// type reaching a document needs a `shield:` covering its classes.
    ///
    /// Empty when the declaration names no payload, which stays legal: the
    /// rule bites on a payload that CARRIES a class, not on its absence.
    pub payload: String,
    /// v4.4.0 — the shield that covers the payload's κ (`axon-T1222`).
    pub shield_ref: String,
    /// `docx | pptx | xlsx` — closed catalog (axon-T910).
    pub target: String,
    /// Optional enterprise template reference (`.dotx/.potx/.xltx`, v2.53.0).
    pub template: String,
    /// `none | embedded | signed` — how the provenance part is emitted
    ///. Empty ⇒ `none`. Closed catalog (axon-T911).
    pub provenance: String,
    /// The propagated effect row — `io`, `storage` (blob sink), and any
    /// `sensitive:<cat>`/`legal:<basis>` the bound data carries.
    pub effects: Option<EffectRow>,
    /// The document body — the closed-catalog block tree.
    pub blocks: Vec<DocBlock>,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.53.0 — one block in a document body. A generic-but-closed node: `kind`
/// is validated against the `target`'s vocabulary, `fields` against the kind's
/// allowed set, and `children` are nested blocks (a `section` holds `para`s; a
/// `slide` holds `bullets`; a `sheet` holds `row`s). Keeping the node generic
/// (rather than one struct per block kind) keeps the grammar/IR small while the
/// checker (`check_document`) enforces the same closed-catalog discipline.
#[derive(Debug, Default)]
pub struct DocBlock {
    /// `section|heading|para|table|chart|image|toc|page_break|footnote|slide|
    /// placeholder|bullets|notes|sheet|row|formula|range|format` — validated
    /// per `target` at check time.
    pub kind: String,
    /// Scalar/list fields (`text:`, `columns:`, `range:`, `attribute:`, …).
    pub fields: Vec<(String, DocScalar)>,
    /// Nested child blocks.
    pub children: Vec<DocBlock>,
    pub loc: Loc,
}

impl DocBlock {
    /// Look up a scalar field by name.
    pub fn field(&self, name: &str) -> Option<&DocScalar> {
        self.fields.iter().find(|(k, _)| k == name).map(|(_, v)| v)
    }
    /// Whether a field is present.
    pub fn has_field(&self, name: &str) -> bool {
        self.fields.iter().any(|(k, _)| k == name)
    }
}

/// v2.53.0 — a document field value. A `Ref` is a binding to a flow value
/// (the epistemic-egress barrier reads its level); a `Text` is a literal; a
/// `List` is a bracketed set; `Int` is a scalar count.
#[derive(Debug, Clone, PartialEq)]
pub enum DocScalar {
    /// A quoted string literal (`"Q3 Results"`, `"B2:B9"`).
    Text(String),
    /// A bare identifier — a reference to a flow value / declared name. THIS is
    /// what the assertion-laundering barrier inspects at an assertive slot.
    Ref(String),
    /// A bracketed list of strings/identifiers (`["Region","Revenue"]`).
    List(Vec<String>),
    /// An integer scalar.
    Int(i64),
    /// A boolean scalar.
    Bool(bool),
}

impl DocScalar {
    /// The referenced name, if this value is a `Ref`.
    pub fn as_ref_name(&self) -> Option<&str> {
        match self {
            DocScalar::Ref(s) => Some(s.as_str()),
            _ => None,
        }
    }
    /// The literal text, if this value is `Text`.
    pub fn as_text(&self) -> Option<&str> {
        match self {
            DocScalar::Text(s) => Some(s.as_str()),
            _ => None,
        }
    }
}

// ── v2.60.0 — Governed CRM Delivery ────────────────────────────────────────

/// v2.60.0 — a declarative CRM delivery. `target:` picks the destination class
/// (`crm`, closed catalog — axon-T921); `provenance:` picks how the epistemic
/// origin of each delivered field is treated at the boundary (`attached` default
/// | `cleared` — axon-T922); `secret:` names the per-tenant credential key
/// (v2.48.0 custody, required — axon-T923); `effects:` carries the propagated row
/// (must include `web` — axon-T924). `ops` is the body — a non-empty list of
/// [`DeliverOp`]s whose `kind` the checker validates against a closed operation
/// catalog (axon-T925). Field values reuse [`DocScalar`]: a `Ref` is a binding to
/// a flow value (what the T920 barrier inspects), the rest are literals.
#[derive(Debug, Default)]

pub struct DeliverDefinition {
    pub name: String,
    /// v4.4.0 — `payload: <Type>`: the DECLARED TYPE this delivery carries to the system of record. The
    /// widest commercial exit the language has, and the κ comes from here.
    ///
    /// Empty when the declaration names no payload, which stays legal: the
    /// rule bites on a payload that CARRIES a class, not on its absence.
    pub payload: String,
    /// v4.4.0 — the shield that covers the payload's κ (`axon-T1223`).
    pub shield_ref: String,
    /// `crm` — closed catalog (axon-T921).
    pub target: String,
    /// `attached | cleared` — how field provenance crosses the boundary
    ///. Empty ⇒ `attached` (the safe default: provenance travels).
    /// Closed catalog (axon-T922).
    pub provenance: String,
    /// The per-tenant credential key resolved via v2.48.0 custody at dispatch — the
    /// value never enters cognition. Required (axon-T923).
    pub secret: String,
    /// The propagated effect row — must include `web` (a CRM write crosses the
    /// trust boundary over the network, axon-T924).
    pub effects: Option<EffectRow>,
    /// The delivery body — the closed-catalog operation list.
    pub ops: Vec<DeliverOp>,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.66.0 — Governed Human Notification: the third egress dual
/// (`deliver` = systems of record, `document` = artifacts, `notify` =
/// human attention). Three laws: T933 (the evidence barrier — a guess
/// reaches a human labeled as a guess, or is refused), T934 (structure:
/// closed channel catalog; the recipient is a v2.48.0 secret-class ref,
/// NEVER a literal — PII never rides source or IR), T935 (attention:
/// a `window:` is mandatory — unbounded interruption is refused).
#[derive(Debug, Default)]
pub struct NotifyDefinition {
    pub name: String,
    /// v4.4.0 — `payload: <Type>`: the DECLARED TYPE this notification carries. A recipient is already
    /// PII (axon-T934); the payload is what the coverage rule reads.
    ///
    /// Empty when the declaration names no payload, which stays legal: the
    /// rule bites on a payload that CARRIES a class, not on its absence.
    pub payload: String,
    /// v4.4.0 — the shield that covers the payload's κ (`axon-T1224`).
    pub shield_ref: String,
    /// `sms | whatsapp | telegram` — closed catalog (axon-T934).
    pub channel: String,
    /// The v2.48.0 secret-class ref the recipient resolves from AT DISPATCH
    /// (`to: secret(ops.oncall_phone)`). The literal number/chat-id never
    /// appears anywhere axon stores or reasons over.
    pub to_secret: String,
    /// True iff `to:` was written in the `secret(...)` form. A literal
    /// recipient is an axon-T934 refusal (with a teaching message).
    pub to_is_secret: bool,
    /// The message template; `${ref}` slots bind flow values post-run.
    pub template: String,
    /// v2.27.0-style duration (`30m`, `4h`, `1d`) — at-most-once-per-window
    /// per recipient (axon-T935; enforced durably by the ENT ledger).
    pub window: String,
    /// `attached | cleared` — how epistemic labels cross to the human
    ///. Empty ⇒ `attached` (the safe default).
    pub provenance: String,
    /// Must include `web` (a notification crosses the trust boundary).
    pub effects: Option<EffectRow>,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.60.0 — one CRM operation in a delivery body. `kind ∈ {upsert_contact,
/// create_deal, add_note}` (validated per-target, axon-T925). Each operation
/// binds a set of `(field, value)` pairs; a `Ref` field carries a flow value
/// into the CRM and is the T920 barrier's subject. Every operation requires a
/// `key:` field — the idempotency key (the design decision, axon-T926) so an at-least-once
/// retry never double-creates a record.
#[derive(Debug, Default)]
pub struct DeliverOp {
    /// `upsert_contact | create_deal | add_note` — validated at check time.
    pub kind: String,
    /// Scalar/ref fields (`key:`, `email:`, `firstname:`, `amount:`, …).
    pub fields: Vec<(String, DocScalar)>,
    pub loc: Loc,
}

impl DeliverOp {
    /// Look up a scalar field by name.
    pub fn field(&self, name: &str) -> Option<&DocScalar> {
        self.fields.iter().find(|(k, _)| k == name).map(|(_, v)| v)
    }
    /// Whether a field is present.
    pub fn has_field(&self, name: &str) -> bool {
        self.fields.iter().any(|(k, _)| k == name)
    }
    /// The flow-value references this operation binds (the barrier's subjects).
    pub fn ref_fields(&self) -> impl Iterator<Item = (&str, &str)> {
        self.fields.iter().filter_map(|(k, v)| match v {
            DocScalar::Ref(name) => Some((k.as_str(), name.as_str())),
            _ => None,
        })
    }
}

// ── v1.1.0 — Resource primitive ───────────────────────────────────────

/// `resource Name { kind, endpoint, capacity, lifetime, certainty_floor, shield }`
///
/// An infrastructure resource declared as a linear, affine, or persistent
/// token. Linear/affine resources cannot be aliased across manifests
/// (Separation Logic `*` disjointness).
#[derive(Debug, Default)]
pub struct ResourceDefinition {
    pub name: String,
    /// v2.67.0 — a CLOSED catalog (`VALID_RESOURCE_KINDS`). Until v2.67.0 this
    /// was a free string that **nothing validated**: `check_resource` never
    /// read it, and no catalog const existed anywhere in the workspace.
    pub kind: String,
    /// v2.67.0 — the DSN, as a **per-tenant config key** (`axon-T944`).
    ///
    /// A production DB URI in source is exactly what `axon-T850` already
    /// forbids one declaration over (*"URLs and credentials never appear in
    /// source"*) and what v2.48.0 custody exists to refuse. `resource` was a
    /// grandfathered violation of the language's own law.
    pub endpoint: String,
    /// v2.67.0 — **the pool size**, and the proof this cycle is a wire and not
    /// a label. Before v2.67.0 every axonstore pool was hardcoded at 10.
    pub capacity: Option<i64>,
    /// v2.67.0 — **how many holders may name this resource** (Linear Logic):
    /// `linear` = exactly one · `affine` = at most one (sharing is a breach) ·
    /// `persistent` = the `!` exponential, freely shared. Default: `affine`.
    pub lifetime: String,
    pub certainty_floor: Option<f64>, // epistemic gate c ∈ [0.0, 1.0]
    pub shield_ref: String,           // optional shield reference
    /// v2.67.0 — the `fabric` this resource lives in. **One field ⇒
    /// Separation-Logic disjointness is unrepresentable, not verified.**
    pub within: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `fabric Name { provider, region, zones, ephemeral, shield }`
///
/// A tagged substrate — the topological container where resources are
/// provisioned. Maps to VPC / cluster / namespace.
#[derive(Debug, Default)]
pub struct FabricDefinition {
    pub name: String,
    pub provider: String, // aws | gcp | azure | kubernetes | bare_metal | custom
    pub region: String,   // provider-specific region id
    pub zones: Option<i64>, // number of availability zones
    pub ephemeral: Option<bool>, // true = destroy on program end
    pub shield_ref: String, // optional shield reference
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `manifest Name { resources, fabric, region, zones, compliance }`
///
/// A declarative specification of desired shape — not a "desired state" in
/// the Terraform sense, a *belief* about structure. Linear/affine resources
/// in `resources` must be disjoint (Separation Logic `*`).
#[derive(Debug, Default)]
pub struct ManifestDefinition {
    pub name: String,
    pub resources: Vec<String>, // references to ResourceDefinition names
    pub fabric_ref: String,     // reference to FabricDefinition name
    pub region: String,
    pub zones: Option<i64>,
    pub compliance: Vec<String>, // κ — regulatory class (v1.2.0)
    /// v4.5.0 — the census this deployment relies on to reduce a postal code
    /// to three digits.
    ///
    /// Safe Harbor (B) permits three digits only where the resulting unit
    /// holds twenty thousand people or more. That is a fact about the world on
    /// a date, not about the program, so the deployment names the source and
    /// the compiler checks only that it was named. Empty unless some control
    /// actually reduces geography — see `axon-T1235`.
    pub census: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `observe Name from Manifest { sources, quorum, timeout, on_partition, certainty_floor }`
///
/// A quorum-gated observation of a manifest's real state. Each output
/// carries ΛD envelope E = ⟨c, τ, ρ, δ⟩; `τ` records observation lag.
/// `on_partition: fail` raises a CT-3 (Network Error) — partitions are ⊥ void.
#[derive(Debug, Default)]
pub struct ObserveDefinition {
    pub name: String,
    pub target: String, // name of ManifestDefinition being observed
    pub sources: Vec<String>,
    pub quorum: Option<i64>,  // Byzantine quorum threshold
    pub timeout: String,      // duration literal "5s", "100ms"
    pub on_partition: String, // fail (CT-3) | shield_quarantine
    pub certainty_floor: Option<f64>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v1.1.0 — Control cognitivo primitives ─────────────────────────────

/// `reconcile Name { observe, threshold, tolerance, on_drift, shield, mandate, max_retries }`
///
/// A cognitive control loop that minimises variational free energy
/// `F = D_KL(q(s) || p(s, o))` between a manifest belief and an observe
/// evidence. Acting on the environment (`on_drift: provision`) is one of
/// the two classical routes to reducing F (the other is belief revision).
#[derive(Debug, Default)]
pub struct ReconcileDefinition {
    pub name: String,
    pub observe_ref: String,
    pub threshold: Option<f64>, // epistemic gate c ∈ [0.0, 1.0]
    pub tolerance: Option<f64>, // drift tolerance [0.0, 1.0]
    pub on_drift: String,       // provision | alert | refine (default: provision)
    pub shield_ref: String,
    pub mandate_ref: String,
    pub max_retries: i64, // default: 3
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `lease Name { resource, duration, acquire, on_expire }`
///
/// Affine/linear lease on a resource, with explicit Δt encoded in the `τ`
/// of the ΛD envelope. Runtime materializes each lease as a revocable
/// token; use post-expiry raises `LeaseExpiredError` (CT-2) per D2.
#[derive(Debug, Default)]
pub struct LeaseDefinition {
    pub name: String,
    pub resource_ref: String,
    pub duration: String,  // "30s", "5m", "2h"
    pub acquire: String,   // on_start | on_demand (default: on_start)
    pub on_expire: String, // anchor_breach | release | extend (default: anchor_breach)
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `ensemble Name { observations, quorum, aggregation, certainty_mode }`
///
/// Byzantine quorum aggregator over ≥2 independent observations. Yields
/// common knowledge `Cφ` (Fagin-Halpern) when at least `quorum` observers
/// agree. Failed observations are excluded; below quorum raises CT-3.
#[derive(Debug, Default)]
pub struct EnsembleDefinition {
    pub name: String,
    pub observations: Vec<String>,
    pub quorum: Option<i64>,
    pub aggregation: String, // majority | weighted | byzantine (default: majority)
    pub certainty_mode: String, // min | weighted | harmonic (default: min)
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v1.1.0 — Topology + π-calculus binary sessions ──────────────────

/// One step in a session protocol.
///
/// v1.1.0: `send T` | `receive T` | `loop` | `end`. v2.3.0 adds **choice**:
/// `select { ℓ: [..], … }` (⊕ — this role chooses) and `branch { ℓ: [..], … }`
/// (& — this role offers); for those `op`s the labelled continuations live in
/// [`SessionStep::branches`] (a nested sub-protocol per label).
#[derive(Debug, Clone, Default)]
pub struct SessionStep {
    pub op: String,           // send | receive | loop | end | select | branch | interrupt
    pub message_type: String, // send/receive: payload type · interrupt: the `on <Signal>` cause
    /// v2.3.0 — populated only for `op == "select" | "branch"`: the labelled
    /// branches, each a nested step sequence (its own sub-protocol).
    ///
    /// v2.36.0 — reused for `op == "interrupt"`: exactly two labelled arms,
    /// `body` (the interruptible region) and `handler` (runs on the signal). The
    /// handler may end in a `resume` step (back to `body`) or reach `end` (the
    /// abandon exit) — see the paper section 3.5 two-exit construct.
    pub branches: Vec<SessionBranch>,
    /// v2.36.0 — `op == "interrupt"` only: the handler's signal binder from
    /// `... as <sig> ...`. Empty for every other op. The handler references the
    /// received `CallInterruptCause` value under this name.
    pub binder: String,
    /// v2.36.0 — `op == "interrupt"` only: `true` when the block declares a
    /// `resumable { … }` handler (the v1 surface always does). Default `false`
    /// keeps every non-interrupt step byte-identical in the IR (skip-if-false).
    pub resumable: bool,
    pub loc: Loc,
}

/// v2.3.0 — one labelled arm of a `select`/`branch` choice: `ℓ: [steps]`.
#[derive(Debug, Clone, Default)]
pub struct SessionBranch {
    pub label: String,
    pub steps: Vec<SessionStep>,
    pub loc: Loc,
}

/// One role in a binary session — name + ordered list of steps.
#[derive(Debug, Default)]
pub struct SessionRole {
    pub name: String,
    pub steps: Vec<SessionStep>,
    pub loc: Loc,
}

/// `session Name { role1: [step, …]  role2: [step, …] }`
///
/// A binary session type — exactly two roles whose protocols MUST be
/// pairwise Honda-Vasconcelos dual. Duality is verified by the type
/// checker; non-dual programs are rejected at compile time.
#[derive(Debug, Default)]
pub struct SessionDefinition {
    pub name: String,
    pub roles: Vec<SessionRole>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `socket Name { protocol: SessionRef, backpressure: credit(n), reconnect:
/// cognitive_state, legal_basis: ... }`
///
/// v2.3.0 — the typed WebSocket transport (paper_websocket_cognitive_primitive.md).
/// `socket` is NOT the protocol — the protocol is a `session` it references by
/// name (protocol and transport kept separate but composable). The type checker
/// resolves `protocol` to a declared `session` (whose two roles are already
/// duality-checked via the v2.3.0 algebra), so the dialogue carried over the WS
/// connection is conformant + deadlock-free by construction.
#[derive(Debug, Default)]
pub struct SocketDefinition {
    pub name: String,
    /// The referenced `session` declaration's name — the protocol.
    pub protocol: String,
    /// The credit window of the typed-resource backpressure (`credit(n)`);
    /// `None` if unspecified. A `0` credit is rejected by the type checker.
    pub backpressure_credit: Option<i64>,
    /// `reconnect: cognitive_state` → `true` (resume mid-dialogue via a sealed
    /// v2.0.0 snapshot); absent or `reconnect: none` → `false`.
    pub reconnect: bool,
    /// Optional `legal_basis:` annotation (enterprise audit/shield gate).
    pub legal_basis: Option<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `upstream Name { transport:, protocol:, role:, resolve:, secret:, auth:,
/// map: [...], reconnect: {...}, overflow:, backpressure: credit(n) }`
///
/// v2.37.0 — the client dual of `socket`: axon dials OUT to a third-party
/// vendor (STT/TTS/realtime speech APIs). The axon-facing interface is a
/// declared `session` (referenced by `protocol:`, same field meaning as
/// `socket`) of which axon plays `role:`; the vendor side is realised by the
/// `map:` projection rules — a compile-time-total transcoding contract
/// (v2.37.0, axon-T849). `resolve:`/`secret:` name per-tenant config keys,
/// never URL/credential literals (axon-T850) — the same "config, not code"
/// property v2.8.0 gave `tool`, extended to persistent duplex streams.
#[derive(Debug, Default)]
pub struct UpstreamDefinition {
    pub name: String,
    /// Wire transport axon dials. Closed catalog; v1 sole member `websocket`.
    pub transport: String,
    /// The referenced `session` declaration's name — the axon-facing protocol.
    pub protocol: String,
    /// Which of the session's two roles axon plays; the peer role is the
    /// vendor's, realised by the `map:` transcoding, never by axon code.
    pub role: String,
    /// Per-tenant config key holding the vendor URL (dot-separated,
    /// `SecretKeyPolicy`-shaped — never a URL literal).
    pub resolve: String,
    /// v2.69.0 — the `resource` this upstream's channel runs on
    /// (`upstream X { resource: Api }`). When present, the upstream DERIVES
    /// its dial address from `resource.endpoint` (a per-tenant config key,
    /// axon-T944) and its **max concurrent connection INSTANCES** from
    /// `resource.capacity` — frames are already governed by
    /// `backpressure_credit`, so capacity bounds CONNECTIONS, never frames
    /// (making it frames would state one fact twice). Mutually exclusive
    /// with `resolve:` (axon-T951): `resource:` beside a `resolve:` would
    /// declare the channel's address twice — the v2.67.0 islands defect.
    /// Authority attenuation: the resource encapsulates its own address
    /// resolution; the upstream only names WHICH channel it rides.
    pub resource_ref: String,
    /// Per-tenant secret binding for the vendor credential (same charset).
    pub secret: String,
    /// Auth handshake kind: `header` | `query` | `signed_url`.
    pub auth_kind: String,
    /// Header/query-param name (`header("Authorization")` / `query("token")`).
    pub auth_name: Option<String>,
    /// Optional header value prefix (`header("Authorization", "Token ")`).
    pub auth_prefix: Option<String>,
    /// The wire↔session transcoding contract; totality checked at v2.37.0.
    pub map: Vec<UpstreamMapRule>,
    /// `reconnect: { backoff_ms:, max_attempts:, on_exhausted: }`.
    pub reconnect: Option<UpstreamReconnect>,
    /// Outbound-queue policy when the VENDOR is the slow side — a member of
    /// the existing `BackpressurePolicy` catalog. `None` ⇒ `fail` (honest
    /// default: no silently-lossy audio unless the adopter opts in).
    pub overflow: Option<String>,
    /// Axon-facing credit window, identical semantics to `socket`.
    pub backpressure_credit: Option<i64>,
    /// v2.37.0 — set when declared via `upstream X from Preset@vN {…}`;
    /// carries the `Preset@vN` reference the desugar pass expanded.
    pub preset: Option<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// One `map:` projection rule: `send M as json [tag "X"]` /
/// `send M as binary` / `receive M as json [when "f" [= "v"]]` /
/// `receive M as binary`. Inbound `json` payloads land as v2.26.0 `Json` (total
/// navigation); the session message name is the routing + duality skeleton.
#[derive(Debug, Default)]
pub struct UpstreamMapRule {
    /// `send` (axon → vendor) or `receive` (vendor → axon).
    pub direction: String,
    /// The session message type this rule transcodes.
    pub message: String,
    /// `json` or `binary` (raw passthrough).
    pub framing: String,
    /// send-json only. Absent ⇒ the payload is sent VERBATIM (the vendor's
    /// exact wire shape, e.g. ElevenLabs `{"text": …}`); present ⇒ the tag
    /// is injected as `"type": "<tag>"` into the payload object (the
    /// Deepgram/OpenAI-Realtime envelope family).
    pub tag: Option<String>,
    /// receive-json only: discriminator field. Absent ⇒ the default
    /// equality discriminator `"type" = "<MessageName>"`.
    pub when_field: Option<String>,
    /// receive-json only. `Some(v)` ⇒ equality match on `when_field`;
    /// `None` with `when_field` present ⇒ field-PRESENCE match (vendors
    /// like Gemini Live mark frame kinds by which key exists). Equality
    /// rules dispatch before presence rules.
    pub when_value: Option<String>,
    pub loc: Loc,
}

/// `voice Name { stt:/tts: XOR realtime:, carrier:, interruptible:,
/// legal_basis:, persona:, context: }`
///
/// v2.37.0 — the simplicity layer over v2.37.0's `upstream`: a blessed-
/// preset phone agent in under 20 lines. `stt:`+`tts:` (cascaded) XOR
/// `realtime:` (fused) — the design decision: one grammar, both architectures, never a
/// special-cased second path. Each leg is a `Preset@vN` reference or a
/// declared `upstream` name. Expansion is pure macro-lowering to existing
/// primitives; `axon desugar` prints it.
#[derive(Debug, Default)]
pub struct VoiceDefinition {
    pub name: String,
    /// Cascaded STT leg (preset ref like `DeepgramSTT@v1` or upstream name).
    pub stt: Option<String>,
    /// Cascaded TTS leg.
    pub tts: Option<String>,
    /// Fused speech-to-speech leg (mutually exclusive with stt/tts — T852).
    pub realtime: Option<String>,
    /// Carrier codec: `mulaw8k` (default — PSTN; expansion emits the ots
    /// μ-law↔PCM16 pair) or `pcm16` (browser/WebRTC-style, no transcode).
    pub carrier: String,
    /// `true` ⇒ the carrier session is a v2.36.0 interruptible region (barge-in
    /// capable) and the socket parks residuals — which REQUIRES
    /// `legal_basis:` (T852; the sugar must not generate a program
    /// `ParkedResidualSoundness` refutes).
    pub interruptible: bool,
    /// Rides onto the generated socket (the v2.36.0 data-at-rest obligation).
    pub legal_basis: Option<String>,
    /// Optional references wired for the flow layer (validated to exist).
    pub persona: Option<String>,
    pub context: Option<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `cors Name { allow_origins:, allow_methods:, allow_headers:,
/// allow_credentials:, max_age:, expose_headers: }`
///
/// v2.38.0 — a named, referenced origin-policy declaration, mirroring
/// `shield`'s shape exactly: declared once, referenced from any number of
/// `axonendpoint`s via `cors: <Name>` (`AxonEndpointDefinition::cors_ref`).
/// Makes the browser-facing origin policy a property of the ENDPOINT,
/// resolved per the tenant's live deployed bundle — the shape a single
/// process-wide CORS knob (the market-standard pattern) cannot express for
/// a multi-tenant deploy where different bundles need different origins
/// for a path with the same name.
///
/// **Unknown fields are a hard parse error** — a CORS policy is
/// security-relevant, so `upstream`/`voice`'s stricter posture is followed
/// here, not `shield`'s lenient `axon-W010` record-and-skip.
#[derive(Debug, Default)]
pub struct CorsDefinition {
    pub name: String,
    /// `["https://app.example.com", "https://*.kivi.io"]` — exact origins
    /// or a single leading-wildcard host-label glob (the design decision/T854); no full
    /// regex, matching the closed/decidable spirit of the rest of the
    /// language. `["*"]` (any-origin) is legal UNLESS `allow_credentials`
    /// is also `true` — that combination is `axon-T853` (the design decision, the CORS
    /// spec's own rule, caught at compile time instead of a silent browser
    /// rejection).
    pub allow_origins: Vec<String>,
    /// Reuses the closed `axonendpoint` method catalog (GET/POST/PUT/
    /// PATCH/DELETE) — validated against the same list, not a free string
    /// (T855).
    pub allow_methods: Vec<String>,
    /// Request headers the preflight may allow (e.g. `["Content-Type",
    /// "Authorization"]`) — free-form header-name strings (hyphens are
    /// common in real header names, hence string literals, not bare
    /// identifiers).
    pub allow_headers: Vec<String>,
    /// `true` ⇒ `Access-Control-Allow-Credentials: true` is emitted.
    /// Forbidden together with an any-origin `allow_origins` (T853).
    pub allow_credentials: bool,
    /// `Access-Control-Max-Age` — a duration literal (`"3600s"`, `"1h"`),
    /// same lexer/token convention as `axonendpoint.timeout`. `None` ⇒ the
    /// header is omitted (browser default caching applies).
    pub max_age: Option<String>,
    /// `Access-Control-Expose-Headers` — response headers the browser's
    /// JS may read beyond the CORS-safelisted set. Free-form strings, same
    /// rationale as `allow_headers`.
    pub expose_headers: Vec<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.46.0 — `credential <Name> { ttl: grants: }`: a named
/// ephemeral-credential contract. `mint <Name> as <binding>` (v2.46.0) mints
/// a TTL-bounded bearer carrying exactly `grants` — and the runtime law
/// (`authority_only_attenuates`) admits the mint only when
/// `grants ⊆ capabilities(minter)`. An unknown field in a `credential { }`
/// block is a HARD PARSE ERROR (the v2.38.0 posture — this is security
/// surface; a typo'd field must not silently produce a permissive
/// contract).
#[derive(Debug, Default)]
pub struct CredentialDefinition {
    pub name: String,
    /// The bearer's lifetime — a duration literal (`"15m"`, `"900s"`),
    /// REQUIRED. Validated by `axon-T894`: parseable, > 0, and ≤ the closed
    /// 24h ceiling (an "ephemeral" credential that lives for days is a
    /// service account wearing a costume — v2.46.0 covers that shape).
    pub ttl: String,
    /// The capability slugs the minted bearer carries — REQUIRED,
    /// non-empty (`axon-T893`), each a dotted slug per
    /// `is_valid_capability_slug` (the `requires:` grammar). Attenuation
    /// (`⊆ minter`) is the runtime/mint-time half of the law.
    pub grants: Vec<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `cache Name { backend:, ttl:, key:, default:, apply_to_effects:,
/// invalidate_on: }` — v2.40.0, a named, referenced result-memoization
/// policy resolved per `tool.cache:` / `retrieve.cache:` (mirrors
/// `CorsDefinition`'s named-and-referenced shape).
///
/// The load-bearing idea: cacheability derives from the type system's
/// existing `effects: pure` proof — a `pure` tool is safe to cache by
/// construction. A `default: true` cache auto-covers every `pure` tool with
/// zero per-tool annotation; widening `apply_to_effects:` beyond `[pure]` is
/// allowed but the compiler names every non-pure tool it covers (W013) AND
/// forces a finite `ttl:` (T865 — you may cache a proven-deterministic result
/// forever, never a non-deterministic one).
///
/// **Unknown fields are a hard parse error** (the v2.38.0 the design decision discipline) — a
/// cache governs correctness (serving a stale/foreign result is a real bug), so
/// a typo'd field can never silently mean "no policy."
#[derive(Debug, Default)]
pub struct CacheDefinition {
    pub name: String,
    /// `redis` (multi-replica, enterprise tier) or `in_process` (the OSS
    /// default single-replica tier). Empty ⇒ `in_process`. Validated against a
    /// closed catalog at check time.
    pub backend: String,
    /// Time-to-live as a duration literal (`"10s"`, `"5m"`, `"1h"`), same lexer
    /// convention as `cors.max_age`/`tool.timeout`. `None` ⇒ "cache forever" —
    /// sound ONLY for a provably-`pure` cache; a non-pure cache with no `ttl:`
    /// is `axon-T865`.
    pub ttl: Option<String>,
    /// `key: [param, ...]` — the SUBSET of the covered tool's `parameters:`
    /// whose bound values form the cache key. Empty ⇒ ALL bound parameters
    /// (the automatic, zero-friction default). Used when one bound arg — e.g. a
    /// `request_id` — must NOT affect the key.
    pub key_params: Vec<String>,
    /// `default: true` ⇒ this cache auto-covers every eligible tool in the
    /// module without a per-tool `cache:` reference. At most one per module
    /// (`axon-T863`). Default `false`.
    pub default_policy: bool,
    /// `apply_to_effects: [pure, ...]` — the effect classes this cache is
    /// willing to memoise. Empty ⇒ `[pure]` (the only provably-safe default).
    /// Any member beyond `pure` is a WIDENING (W013 names each covered tool)
    /// and forces a finite `ttl:` (T865).
    pub apply_to_effects: Vec<String>,
    /// `invalidate_on: [Channel, ...]` — an `emit` on any listed channel
    /// flushes this cache's namespace. Each must resolve to a declared
    /// `channel` (`axon-T864`). Reuses the v1.6.0 pub/sub, not a second mechanism.
    pub invalidate_on: Vec<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.42.0 — `savant <Name> { domain:, cognition{…}, memory{…}, budget{…},
/// mandate <M> {…} … }` — the long-horizon autonomous research primitive.
///
/// A `savant` is a declarative ORCHESTRATOR, not a new engine: it composes the
/// primitives Axon already ships (memory/corpus retention, `par` swarms, the
/// `quant` Hilbert substrate, `forge` novelty synthesis, the `daemon` host, the
/// v2.28.0 linear budget, the v2.36.0 interruptible session, the v2.34.0 signed egress)
/// into a single governed research loop. The paper's vision (papers/
/// paper_primitiva_savant.md) grounded to real primitives in its section 9.
///
/// v2.42.0 parses the FULL block surface; the semantics land incrementally:
/// param-catalog + typed-output validation is v2.42.0 (checker), memory-ref
/// resolution + v2.28.0 budget binding + v2.36.0 interruptibility is v2.42.0, and the
/// `SavantSoundness` PCC proof is v2.42.0. **Unknown fields are a hard parse
/// error** (the v2.38.0 the design decision discipline, as `cache`/`cors`): a savant governs an
/// expensive, risk-bearing autonomous process, so a typo'd field can never
/// silently mean "no policy."
#[derive(Debug, Default)]
pub struct SavantDefinition {
    pub name: String,
    /// `domain: "…"` — the ontological scope of the generative boundary (the
    /// research topic the free-energy loop minimises surprise over). Required
    /// (v2.42.0 `axon-T873`); empty until parsed.
    pub domain: String,
    /// `cognition { … }` — the epistemic parameters of the active-inference
    /// engine (depth / entropic threshold / divergence). `None` ⇒ engine
    /// defaults (v2.42.0 supplies a catalog-checked default).
    pub cognition: Option<SavantCognition>,
    /// `memory { … }` — the retention layer. `backend` resolves to a declared
    /// `memory`/`corpus` primitive in v2.42.0 (`axon-T875`); `None` ⇒ ephemeral.
    pub memory: Option<SavantMemory>,
    /// `budget { … }` — the compute ceiling. Bound to a v2.28.0 linear budget
    /// (`RateLease`) in v2.42.0 so `max_iterations` is a TYPE-enforced ceiling,
    /// not a hope. `None` ⇒ v2.42.0 rejects (a weeks-long autonomous loop with no
    /// budget is uninsurable).
    pub budget: Option<SavantBudget>,
    /// `mandate <Name> { objective:, output: }` — one or more epistemic
    /// mandates the savant autonomously decomposes into tasks. At least one
    /// required (v2.42.0 `axon-T874`).
    pub mandates: Vec<SavantMandate>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.42.0 — the `cognition { … }` sub-block of a [`SavantDefinition`]: the
/// active-inference engine's epistemic parameters (paper section 3, section 7.1).
#[derive(Debug, Default)]
pub struct SavantCognition {
    /// `depth: standard | deep | hyper` — the HRR dimensionality tier of the
    /// holographic memory codec. Closed catalog (v2.42.0 `axon-T876`).
    pub depth: String,
    /// `entropic_threshold: <float>` — the Expected-Free-Energy convergence
    /// bound: the loop halts synthesis when no policy reduces EFE below this.
    /// Must be `> 0` (v2.42.0). `None` ⇒ engine default.
    pub entropic_threshold: Option<f64>,
    /// `divergence: low | med | high` — how aggressively the loop explores
    /// epistemic (β₂) voids vs. exploiting known structure. Closed catalog.
    pub divergence: String,
    pub loc: Loc,
}

/// v2.42.0 — the `memory { … }` sub-block of a [`SavantDefinition`]: the
/// durable retention layer, composed from existing `memory`/`corpus` primitives.
#[derive(Debug, Default)]
pub struct SavantMemory {
    /// `backend: <Name>` — a reference to a declared `memory` or `corpus`
    /// primitive (resolved in v2.42.0 `axon-T875`). Empty ⇒ ephemeral memory.
    pub backend: String,
    /// `corpus_graph: <bool>` — whether to iteratively index the ingested
    /// corpus as a simplicial-complex graph for the topological (β_n) reading.
    pub corpus_graph: bool,
    /// `isolation_level: strict | …` — per-tenant tensor partitioning. The
    /// enterprise engine enforces it; OSS records it. Empty ⇒ default.
    pub isolation_level: String,
    pub loc: Loc,
}

/// v2.42.0 — the `budget { … }` sub-block of a [`SavantDefinition`]: the
/// compute ceiling, bound to a v2.28.0 linear budget in v2.42.0.
#[derive(Debug, Default)]
pub struct SavantBudget {
    /// `max_iterations: <int>` — the hard ceiling on FEP-loop iterations before
    /// the savant pauses (the paper's `compute_budget`). `> 0` (v2.42.0).
    pub max_iterations: Option<i64>,
    /// `max_tool_synth: <int>` — the hard ceiling on `synth` (v2.42.0) dynamic
    /// tool-creation events per mandate. `None` ⇒ 0 (no synthesis).
    pub max_tool_synth: Option<i64>,
    pub loc: Loc,
}

/// v2.42.0 — a `mandate <Name> { objective:, output: }` sub-block of a
/// [`SavantDefinition`]: one epistemic research goal the savant pursues.
#[derive(Debug, Default)]
pub struct SavantMandate {
    pub name: String,
    /// `objective: "…"` — the natural-language research goal. Required
    /// (non-empty, v2.42.0 `axon-T874`).
    pub objective: String,
    /// `output: <Type>` — the declared type the final report must inhabit
    /// (resolved to a declared `type` in v2.42.0). Required.
    pub output_type: String,
    pub loc: Loc,
}

/// v2.42.0 — `synth <Name> { target:, risk:, language:, sandbox:, review:,
/// max_lines: }` — a dynamic tool-synthesis policy.
///
/// A `savant` that hits an epistemic gap it has no tool for can, under such a
/// policy, deduce + write a tool (a Coder sub-agent, a Reviewer sub-agent — a
/// `par` with an agreement condition), compile it to `wasm32-wasi`, and run it
/// in an Extism zero-trust sandbox, feeding stdout back as empirical evidence
/// (paper section 6). The policy declares the SAFETY ENVELOPE; the runtime enforces it.
///
/// **Deny-by-default (D87.d):** OSS parses + statically disciplines this policy
/// but ships a `SynthBackend` reference that REFUSES to execute — running
/// untrusted synthesised code needs the enterprise Extism/gVisor isolation
/// (v2.42.0). The checker therefore requires `sandbox: wasm` (T882): a synth
/// policy that would run code outside a sandbox can never compile.
///
/// **Unknown fields are a hard parse error**: a synth policy governs
/// arbitrary-code execution — the highest-stakes surface in the language.
#[derive(Debug, Default)]
pub struct SynthDefinition {
    pub name: String,
    /// `target: "…"` — what the synthesised tools are for (the capability scope).
    /// Required (v2.42.0 `axon-T879`).
    pub target: String,
    /// `risk: low | medium | high | critical` — the ceiling risk class the
    /// policy admits; governs review + isolation strictness. Required
    /// (v2.42.0 `axon-T880`).
    pub risk: String,
    /// `language: rust | c | python` — the allowed synthesis source language
    /// (all compiled to `wasm32-wasi`). Empty ⇒ any admitted language
    /// (v2.42.0 `axon-T881` validates when present).
    pub language: String,
    /// `sandbox: wasm` — the isolation tier. MUST be `wasm` (v2.42.0 `axon-T882`
    /// deny-by-default): synthesised code may only run in a zero-trust WASM
    /// sandbox. Empty ⇒ error (never a silent "no sandbox").
    pub sandbox: String,
    /// `review: required | none` — the Coder/Reviewer consensus requirement.
    /// Empty ⇒ `required` (the safe default). `none` is FORBIDDEN for
    /// `high`/`critical` risk (v2.42.0 `axon-T883`).
    pub review: String,
    /// `max_lines: <int>` — an optional hard cap on synthesised source length
    /// (a smaller attack + review surface). `None` ⇒ engine default.
    pub max_lines: Option<i64>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `reconnect: { backoff_ms: 500, max_attempts: 5, on_exhausted: fail }` —
/// exponential backoff (doubling from `backoff_ms`, jittered at runtime), at
/// most `max_attempts` redials; `on_exhausted` is a closed catalog mirroring
/// `budget`'s style (v1 sole member `fail` — fail-closed, the flow sees the
/// exhaustion; `degrade`/`park` are named deferred scope).
#[derive(Debug, Default)]
pub struct UpstreamReconnect {
    pub backoff_ms: i64,
    pub max_attempts: i64,
    pub on_exhausted: String,
}

/// `source -> target : Session` — one directed edge of a topology.
///
/// Convention: the source plays the FIRST role of the session; the target
/// plays the SECOND role. Fixed so assignment is unambiguous.
#[derive(Debug, Default)]
pub struct TopologyEdge {
    pub source: String,
    pub target: String,
    pub session_ref: String,
    pub loc: Loc,
}

/// `topology Name { nodes: […]  edges: [A -> B : Session, …] }`
///
/// A typed directed graph over Axon entities. Edges carry session references
/// whose duality the type checker enforces; the graph is statically analysed
/// for Honda-liveness (deadlock-prone cycles).
#[derive(Debug, Default)]
pub struct TopologyDefinition {
    pub name: String,
    pub nodes: Vec<String>,
    pub edges: Vec<TopologyEdge>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v1.1.0 — Cognitive immune system (per paper_immune_v2.md) ────────

/// `immune Name { watch, sensitivity, baseline, window, scope, tau, decay }`
///
/// A continuous anomaly sensor over a declared observation vector.
/// Computes D_KL(q_baseline || p_observed) (paper section 3.2) and emits a
/// HealthReport at an epistemic level derived from the KL magnitude.
///
/// Pure sensor — `immune` takes NO action. Actions belong to `reflex`
/// and `heal`, which consume its HealthReport.
#[derive(Debug, Default)]
pub struct ImmuneDefinition {
    pub name: String,
    pub watch: Vec<String>,       // observe / ensemble / any declared ref
    pub sensitivity: Option<f64>, // [0.0, 1.0]
    pub baseline: String,         // "learned" (default) or name of a prior
    pub window: i64,              // samples used to estimate baseline (default: 100)
    pub scope: String, // tenant | flow | global (MANDATORY, paper section 8.2)
    pub tau: String,              // duration half-life
    pub decay: String,            // exponential (default) | linear | none
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `reflex Name { trigger, on_level, action, scope, sla }`
///
/// Deterministic, O(1) motor response. Contract invariants (paper section 4.2):
/// never invokes an LLM; no long-running I/O; every activation emits a
/// signed_trace; idempotent on the same HealthReport.
#[derive(Debug, Default)]
pub struct ReflexDefinition {
    pub name: String,
    pub trigger: String,  // immune name (MANDATORY)
    pub on_level: String, // know | believe | speculate | doubt (default: doubt)
    pub action: String,   // drop | revoke | emit | redact | quarantine | terminate | alert
    pub scope: String, // MANDATORY, paper section 8.2
    pub sla: String,      // duration budget (e.g. "1ms")
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `heal Name { source, on_level, mode, scope, review_sla, shield, max_patches }`
///
/// Linear-Logic one-shot patch synthesis. Patch type:
/// `!Synthesized ⊸ Applied ⊸ Collapsed` (paper section 6) — each transition
/// consumes its predecessor, guaranteeing single application + forced collapse.
///
/// Mode ∈ {audit_only | human_in_loop | adversarial} controls automation
/// (paper section 7); `adversarial` REQUIRES a shield gate (paper section 7.3).
#[derive(Debug, Default)]
pub struct HealDefinition {
    pub name: String,
    pub source: String,     // immune name (MANDATORY)
    pub on_level: String,   // know | believe | speculate | doubt
    pub mode: String,       // audit_only | human_in_loop | adversarial
    pub scope: String,      // MANDATORY
    pub review_sla: String, // duration
    pub shield_ref: String, // optional shield gate (required for adversarial)
    pub max_patches: i64,   // bounded heal attempts (default: 3)
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v1.3.1 — UI cognitiva (component / view) ─────────────────────────

/// `component Name { renders, via_shield, on_interact, render_hint }`.
///
/// A reusable UI fragment. `renders` is the data type the component
/// visualizes; if that type has κ, `via_shield` is mandatory and its
/// compliance set MUST cover the type's κ (compile-time enforcement).
#[derive(Debug, Default)]
pub struct ComponentDefinition {
    pub name: String,
    pub renders: String,
    pub via_shield: String,
    pub on_interact: String,
    pub render_hint: String, // card | list | form | chart | custom
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `view Name { title, components: [...], route }`.
///
/// A top-level screen. `components` is an ordered list of declared
/// `component` names composed in the view's primary layout.
#[derive(Debug, Default)]
pub struct ViewDefinition {
    pub name: String,
    pub title: String,
    pub components: Vec<String>,
    pub route: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Tier 2+ structural fallback ──────────────────────────────────────────────

/// A declaration we recognize by keyword but parse only structurally.
/// Validates brace balance and captures keyword + name.
#[derive(Debug)]
pub struct GenericDeclaration {
    pub keyword: String,
    pub name: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Agent ────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct AgentDefinition {
    pub name: String,
    pub goal: String,
    pub tools: Vec<String>,
    pub memory_ref: String,
    pub strategy: String, // react | reflexion | plan_and_execute | custom
    pub on_stuck: String, // forge | hibernate | escalate | retry
    pub shield_ref: String,
    pub max_iterations: Option<i64>,
    pub max_tokens: Option<i64>,
    pub max_time: String,
    pub max_cost: Option<f64>,
    /// The declared result type of the agent — `return: T` inside the block,
    /// or the `-> T` position after the name. Empty when undeclared. Checked
    /// against the declared types (axon-T1219) and against the `output:` of
    /// the step that calls the agent.
    pub return_type: String,
    /// The `step … { … }` sequence written inside the agent block — the control
    /// policy of `strategy: custom`. Empty for every other strategy (a body
    /// under `react`/`reflexion`/`plan_and_execute` is axon-T1217). Until 4.1.0
    /// the parser discarded these blocks and `custom` was refused at dispatch.
    pub body: Vec<StepNode>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v2.5.0 — Closed-catalog extension mechanism ────────────────────────────

/// One member of an `extension` declaration. For `category: effects`
/// the `name` is a provenance base (e.g. `"epistemic:believe"`) with
/// optional `semantics` + `default_confidence` (a CEILING, never a
/// floor — v2.5.0 tainted-overriding). For `category: scan` the `name`
/// is a scan-category identifier and the metadata is typically absent.
#[derive(Debug, Clone)]
pub struct ExtensionMember {
    pub name: String,
    pub semantics: Option<String>,
    pub default_confidence: Option<f64>,
    pub loc: Loc,
}

/// `extension Name { category: effects|scan, members: [ "x" : { … }, … ] }`
///
/// v2.5.0. A first-class, auditable + gateable declaration that
/// expands a closed catalog with adopter-specific PROVENANCE members.
/// Soundness invariants (validated in v2.5.0/v2.5.0): members are
/// provenance-class only (never the enforceable effect set), must not
/// shadow a canonical base/category, and ride in the IR + proof bundle
/// so an independent PCC verifier re-derives against the same artifact.
#[derive(Debug)]
pub struct ExtensionDefinition {
    pub name: String,
    /// `effects` | `scan` — validated against the closed category set
    /// in v2.5.0 (the type-checker), not the parser.
    pub category: String,
    pub members: Vec<ExtensionMember>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia. Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia. Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Shield ───────────────────────────────────────────────────────────────────

/// v2.27.0 — a temporal execution-window guard. Where `shield` guards the
/// CONTENT of an emission and `anchor` guards its TRUTH, `window` guards its
/// TIMING: whether a scheduled (cron) tick runs, by timezone-aware day/hour
/// windows. The runtime decision (`is_in_window`) lands in v2.27.0; the daemon
/// binding + the defer ledger in v2.27.0.
#[derive(Debug)]
pub struct WindowDefinition {
    pub name: String,
    /// IANA timezone (`"America/Bogota"`). Format-checked at compile time
    /// (v2.27.0); full IANA membership validated by the runtime (v2.27.0, chrono-tz).
    pub timezone: String,
    /// The allowed day/hour spans (at least one). A tick inside ANY span runs.
    pub allow: Vec<WindowSpan>,
    /// v2.27.0 — excluded dates (holidays): ISO `YYYY-MM-DD` date-string
    /// literals (`exclude: [ "2026-12-25", "2026-01-01" ]`). A tick whose local
    /// date (in `timezone`) is in this set is OUTSIDE the window regardless of the
    /// hour spans. The dates are LITERAL — part of the verified program, so the
    /// decision stays a pure, replayable function of `(now, the window, the tz-db
    /// version)` (the `time_is_an_explicit_input` doctrine). Empty ⇒ no holidays.
    pub exclude: Vec<String>,
    /// What to do when a tick falls OUTSIDE every allowed span:
    /// `skip` | `defer` | `warn` (closed catalog).
    pub on_outside: String,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.27.0 — one allowed day/hour span, `{ days: Mon..Fri, hours: 9..18 }`.
/// `days` are inclusive weekday-name bounds; `hours` are inclusive 0–23 bounds.
#[derive(Debug)]
pub struct WindowSpan {
    pub day_start: String,
    pub day_end: String,
    pub hour_start: i64,
    pub hour_end: i64,
    pub loc: Loc,
}

/// `attest <Name> { for:, basis:, residual:, by:, on: }`
///
/// v4.5.0 — the half of a de-identification that a compiler cannot produce.
///
/// A declassification retires a regulatory class from a value, and by v4.5.0
/// the compiler decides most of what that requires: the class is real, the
/// control declares the capability, the destination type no longer carries the
/// class, every enumerable identifier is removed or reduced. What it cannot
/// decide is the remainder — the eighteenth Safe Harbor class and the
/// actual-knowledge clause, both of which quantify over facts the program does
/// not contain — and, entirely, the other legal route: expert determination.
///
/// Those do not become weaker compiler claims. They become a signature, with an
/// owner and a date, that travels in the evidence package NEXT TO the proof and
/// distinct from it. The point of the separation is that a reader can see where
/// the machine stopped talking and a person started.
///
/// It is a top-level declaration and not a `shield` block, per the founder’s
/// ratification: a shield is a control that executes and its scope ends with
/// the run, while an attestation is a fact that outlives the control that
/// motivated it — reused for a later legal basis, cited by a second
/// determination, and shipped on its own.
#[derive(Debug, Default)]
pub struct AttestDefinition {
    pub name: String,
    /// The type this determination is ABOUT — the output of the
    /// declassification, not its input. An attestation over the regulated
    /// value would be a statement about data nobody claimed was clean.
    pub for_type: String,
    /// `safe_harbor` | `expert_determination` — see `ATTESTATION_BASES`.
    pub basis: String,
    /// The judgements the signer takes on: precisely what the compiler left
    /// open. See `RESIDUAL_JUDGEMENTS`.
    pub residual: Vec<String>,
    /// Who signs. Prose on purpose — the compiler has no register of people
    /// and inventing a closed catalogue of them would be a fiction. What it
    /// CAN require is that the field not be empty, because an unattributed
    /// attestation is indistinguishable from a shortcut.
    pub by: String,
    /// When, ISO-8601. A determination is about a state of the world on a
    /// date; without one it cannot be superseded, and a determination that
    /// cannot go stale is not a determination.
    pub on: String,
    pub unknown_fields: Vec<(String, Loc)>,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

#[derive(Debug)]
pub struct ShieldDefinition {
    pub name: String,
    pub scan: Vec<String>,
    pub strategy: String, // pattern | classifier | dual_llm | canary | perplexity | ensemble
    pub on_breach: String, // halt | sanitize_and_retry | escalate | quarantine | deflect
    pub severity: String, // low | medium | high | critical
    pub quarantine: String,
    pub max_retries: Option<i64>,
    pub confidence_threshold: Option<f64>,
    pub allow_tools: Vec<String>,
    pub deny_tools: Vec<String>,
    pub sandbox: Option<bool>,
    pub redact: Vec<String>,
    /// v4.5.0 — the regulatory classes this shield is authorised to RETIRE.
    ///
    /// Empty for almost every shield, and that is the point: scanning is not
    /// declassifying. A control that can end a regulatory obligation says so.
    pub declassifies: Vec<String>,
    /// v4.5.0 — the identifier KINDS this control removes entirely.
    ///
    /// Kinds, not field names, deliberately. A control that named
    /// `[mrn, ssn]` would be welded to one type's spelling and useless on the
    /// next; a control that names `[medical_record_number, ssn]` describes
    /// what it does to DATA and is reusable wherever that data appears. It is
    /// also the only form the catalogue can check: field names are prose.
    pub suppress: Vec<String>,
    /// v4.5.0 — the identifier kinds this control REDUCES rather than removes.
    ///
    /// The shield names the kind; the regime says how. Safe Harbor reduces a
    /// date to its year and a postal code to three digits, and those
    /// operations come from `HIPAA_SAFE_HARBOR` rather than being restated
    /// here — an author who could restate them could restate them wrong, and
    /// the regulation is the source.
    pub generalise: Vec<String>,
    pub log: String,
    pub deflect_message: String,
    pub taint: String,
    /// ESK — regulatory coverage (HIPAA, PCI_DSS, GDPR, …).
    pub compliance: Vec<String>,
    /// v2.34.0 — egress signing algorithm (closed catalog: `hmac_sha256`,
    /// `axon-T846`). Empty = the shield does not sign. A shield with `sign:`
    /// is an EGRESS shield: `publish <Channel> within <Shield>` marks the
    /// channel for signed external delivery (v2.34.0).
    pub sign: String,
    /// v2.34.0 (`axon-W010`) — block fields the parser did not recognize,
    /// with their source locations. Pre-77 the parser silently discarded
    /// these (`_ => skip_value()`), so a typo or an unsupported field passed
    /// `axon check` unremarked (Kivi brief #51 B.3). The parser still skips
    /// the VALUE (leniency preserved — existing programs keep compiling) but
    /// records the NAME so the type checker can warn honestly.
    pub unknown_fields: Vec<(String, Loc)>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Pix ──────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct PixDefinition {
    pub name: String,
    pub source: String,
    pub depth: Option<i64>,
    pub branching: Option<i64>,
    pub model: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Ledger ─────────────────────────────────────────────────────────────────
// v2.12.0 — the append-only, hash-linked audit chain. Took over the
// Provenance-Index role that `pix` historically (and only in the ℰMCP doc)
// occupied, so `pix` is freed for its true meaning: the PIX retrieval
// navigator (paper `paper_pix_formal_research.md`). A `ledger` binds a chain
// recorder to an audited surface (`axonstore://X`, `flow://X`, …); `depth`
// is chain retention, `branching` the Merkle factor, `model` the hash slug.

#[derive(Debug)]
pub struct LedgerDefinition {
    pub name: String,
    pub source: String,
    pub depth: Option<i64>,
    pub branching: Option<i64>,
    pub model: String,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Psyche ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct PsycheDefinition {
    pub name: String,
    pub dimensions: Vec<String>,
    pub manifold_noise: Option<f64>,
    pub manifold_momentum: Option<f64>,
    pub safety_constraints: Vec<String>,
    pub quantum_enabled: Option<bool>,
    pub inference_mode: String, // active | passive
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Corpus ───────────────────────────────────────────────────────────────────

/// v2.13.0 — a typed, weighted edge of an MDN corpus graph: `etype(from, to,
/// weight)`. `etype` is from the closed relation catalog (cite / elaborate /
/// corroborate / depend / implement / exemplify / contradict / supersede);
/// `from`/`to` name documents declared in the corpus; `weight ∈ (0, 1]`.
#[derive(Debug, Clone)]
pub struct CorpusRelation {
    pub etype: String,
    pub from: String,
    pub to: String,
    pub weight: f64,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct CorpusDefinition {
    pub name: String,
    pub documents: Vec<String>, // simplified: list of pix refs
    /// v2.13.0 — the typed weighted edges that make this corpus an MDN graph
    /// `C = (D, R, τ, ω, σ)`. Empty ⇒ the flat (edgeless) corpus.
    pub relations: Vec<CorpusRelation>,
    /// v2.13.0 — `adaptive: true` enables the memory endofunctor: navigations
    /// over this corpus learn (semantic edge reinforcement + procedural bias),
    /// and subsequent navigations use the memory-modified EPR. Requires the
    /// graph to carry edges (static `relations:` OR a store-sourced edge store).
    pub adaptive: bool,
    pub mcp_server: String,
    pub mcp_resource_uri: String,
    /// v2.14.0 — when `Some`, this is a DYNAMIC store-sourced MDN graph
    /// (`corpus N from axonstore { documents: DocStore(id, title)  relations:
    /// EdgeStore(from, to, etype, weight) }`): the documents and typed edges live
    /// as ROWS in two declared `axonstore`s and the graph is built from the live
    /// rows at navigate-time (per-tenant, growing). Mutually exclusive with the
    /// static v2.13.0 form — the `documents`/`relations`/`mcp_*` fields stay empty.
    /// `None` ⇒ the static compile-time corpus (back-compat byte-identical).
    pub store_source: Option<CorpusStoreSource>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.14.0 — the dynamic, `axonstore`-sourced backing of an MDN corpus graph.
/// The graph's documents and typed edges are ROWS in two declared `axonstore`s,
/// so the graph grows at runtime (a new `persist` = a new node/edge) and is
/// per-tenant by inheritance from the store's v2.0.0 column-proof / RLS scope. The
/// runtime builds the `mdn::Corpus` from the live rows at navigate-time.
///
/// Surface:
/// ```text
/// corpus LtmGraph from axonstore {
///     documents: LtmSummaries( id, summary )                 // (id-col, title-col)
///     relations: LtmEdges( from_id, to_id, etype, weight )   // (from, to, etype, weight)
///     adaptive: true
/// }
/// ```
/// Documents and edges live in SEPARATE stores (an `axonstore` is one table with
/// one column schema). The type-checker (`check_corpus`) validates that both
/// stores are declared and — when they carry a v1.31.0 column schema — that the
/// mapped columns exist with compatible types (id present; title text-like;
/// from/to match the id type; etype text-like; weight numeric). The weight-range
/// invariant `ω ∈ (0, 1]` (G4) becomes a RUNTIME check here, since weights are
/// per-row dynamic (clamp on read + store CHECK), not a compile-time literal.
#[derive(Debug, Clone)]
pub struct CorpusStoreSource {
    pub doc_store: String,
    pub doc_id_col: String,
    pub doc_title_col: String,
    pub edge_store: String,
    pub edge_from_col: String,
    pub edge_to_col: String,
    pub edge_type_col: String,
    pub edge_weight_col: String,
    pub loc: Loc,
}

// ── Dataspace ────────────────────────────────────────────────────────────────

/// v2.63.0 — the closed dataspace column-type catalog.
///
/// Six types, because a dataspace column type maps 1:1 to a physical
/// columnar buffer layout in the deterministic engine (v2.63.0, plan section 5.1):
///
/// | Type        | Physical layout                                    |
/// |-------------|----------------------------------------------------|
/// | `Text`      | offsets `O ∈ ℤ₊^{N+1}` + raw UTF-8 byte buffer     |
/// | `Int`       | contiguous `i64` buffer (8 bytes/element)          |
/// | `Float`     | contiguous `f64` buffer (8 bytes/element)          |
/// | `Bool`      | bit-packed buffer                                  |
/// | `Timestamp` | contiguous `i64` epoch-microseconds buffer         |
/// | `Json`      | offsets + raw serialized-JSON byte buffer          |
///
/// Deliberately NOT `StoreColumnType` (v1.31.0): that catalog is
/// SQL-backend-oriented (Uuid, Numeric, Bytea, …); this one is the
/// engine's physical truth. `Float` is **f64** — diverging from the
/// research paper's Float32 on purpose: axon's determinism norm is
/// exact f64 (the v2.4.0 reference-simulator precedent), and halving
/// width is a performance claim we do not make pre-Sandbox.
/// Every column is nullable via the validity bitmap; nullability is
/// the ONLY flexibility.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum DataspaceColumnType {
    Text,
    Int,
    Float,
    Bool,
    Timestamp,
    Json,
}

impl DataspaceColumnType {
    /// The closed catalog in canonical declaration order.
    pub fn all() -> [DataspaceColumnType; 6] {
        [
            DataspaceColumnType::Text,
            DataspaceColumnType::Int,
            DataspaceColumnType::Float,
            DataspaceColumnType::Bool,
            DataspaceColumnType::Timestamp,
            DataspaceColumnType::Json,
        ]
    }

    pub fn canonical_name(self) -> &'static str {
        match self {
            DataspaceColumnType::Text => "Text",
            DataspaceColumnType::Int => "Int",
            DataspaceColumnType::Float => "Float",
            DataspaceColumnType::Bool => "Bool",
            DataspaceColumnType::Timestamp => "Timestamp",
            DataspaceColumnType::Json => "Json",
        }
    }

    pub fn all_canonical_names() -> Vec<&'static str> {
        Self::all().iter().map(|t| t.canonical_name()).collect()
    }

    /// Resolve a declared type token — canonical names plus the common
    /// lowercase aliases (the v1.31.0 `from_token` convention).
    pub fn from_token(name: &str) -> Option<DataspaceColumnType> {
        match name {
            "Text" | "text" | "string" | "String" => Some(DataspaceColumnType::Text),
            "Int" | "int" | "integer" | "i64" => Some(DataspaceColumnType::Int),
            "Float" | "float" | "double" | "f64" => Some(DataspaceColumnType::Float),
            "Bool" | "bool" | "boolean" => Some(DataspaceColumnType::Bool),
            "Timestamp" | "timestamp" | "datetime" => Some(DataspaceColumnType::Timestamp),
            "Json" | "json" => Some(DataspaceColumnType::Json),
            _ => None,
        }
    }
}

/// v2.63.0 — one declared dataspace column: `column <name>: <Type>`.
/// The type is kept RAW at parse time (the string the adopter wrote);
/// the v2.63.0 type-checker resolves it against the closed catalog and
/// emits `axon-T928` on a miss — so ALL schema errors in a declaration
/// accumulate in one compile, instead of dying at the first bad token.
#[derive(Debug)]
pub struct DataspaceColumn {
    pub name: String,
    pub declared_type: String,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct DataspaceDefinition {
    pub name: String,
    /// v2.63.0 — the typed columnar schema. A dataspace IS its
    /// schema: the v2.63.0 type-checker refuses an empty one (axon-T928).
    pub columns: Vec<DataspaceColumn>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── OTS ──────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct OtsDefinition {
    pub name: String,
    pub teleology: String,
    pub homotopy_search: String, // shallow | deep | speculative
    pub loss_function: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Mandate ──────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct MandateDefinition {
    pub name: String,
    pub constraint: String,
    pub kp: Option<f64>,
    pub ki: Option<f64>,
    pub kd: Option<f64>,
    pub tolerance: Option<f64>,
    pub max_steps: Option<i64>,
    /// v2.83.0 — declared drift bound `D` (`sup|drift(t)|`, paper_mandate
    /// section 3). A HYPOTHESIS the runtime must discharge by measurement, not a fact.
    pub drift_bound: Option<f64>,
    /// v2.83.0 — declared Lipschitz constant `L` of the refinement map
    /// (prompt_opt section 6.3). Same standing as `drift_bound`.
    pub lipschitz: Option<f64>,
    pub on_violation: String, // coerce | halt | retry
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Compute ──────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct ComputeDefinition {
    pub name: String,
    pub shield_ref: String,
    /// v2.67.0 — the typed parameters. Before v2.67.0, `parse_compute` SKIPPED
    /// everything between the name and the brace ("Skip optional parameters/
    /// return type"), so a compute had no inputs at all — which is one reason it
    /// could not compute anything.
    pub parameters: Vec<Parameter>,
    /// v2.67.0 — the declared result type.
    pub return_type: String,
    /// v2.67.0 — **the body**: a v2.26.0 `Expr`.
    ///
    /// This is what makes `compute` honest. The README sells it as "Deterministic
    /// muscle — native Fast-Path execution BYPASSING the LLM" and even asserts a
    /// complexity class ("compute steps: O(n)"). A v2.26.0 expression is exactly that
    /// and nothing more: a closed, total, side-effect-free term the runtime
    /// evaluates with `eval_expr` — the same native evaluator `let`, `grad` and
    /// `conditional` already use. Linear in the term. No model in the loop.
    ///
    /// `None` ⇒ a compute that cannot compute; applying it is refused
    /// (axon-T941), rather than binding the literal string `"compute:Name(args)"`
    /// as the pre-v2.67.0 runtime did — which a downstream step then consumed as if
    /// it were a number.
    pub body: Option<Expr>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Daemon ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct DaemonDefinition {
    pub name: String,
    pub goal: String,
    pub tools: Vec<String>,
    pub memory_ref: String,
    pub strategy: String, // react | reflexion | plan_and_execute | custom
    pub on_stuck: String, // hibernate | escalate | retry | forge
    pub shield_ref: String,
    /// v2.27.0 — the `window:` temporal binding (a `window` primitive name,
    /// v2.27.0). When set, the supervisor evaluates the bound window before
    /// claiming a scheduled tick: inside ⇒ fire; outside ⇒ `skip`/`warn`/`defer`
    /// per the window's `on_outside`. Empty for daemons with no temporal guard.
    pub window_ref: String,
    /// v2.28.0 — the `budget { … }` linear-effect rate limit. When set, each
    /// `on Tool(X)` quota gates that tool's dispatch on a renewable token bucket
    /// (the v2.28.0 `RateLease`): a call consumes a token, exhaustion applies
    /// `on_exhausted`. `None` for daemons with no effect budget.
    pub budget: Option<BudgetBlock>,
    pub max_tokens: Option<i64>,
    pub max_time: String,
    pub max_cost: Option<f64>,
    /// v1.6.0 D4 — listen blocks captured for type-checker
    /// validation (typed-channel ref + dual-mode deprecation warning).
    /// Pre-v1.6.0 the parser discarded these structurally; we now
    /// retain them so 13.b/13.f can validate emit/publish/discover
    /// inside listener bodies and surface D4 string-topic warnings.
    pub listeners: Vec<ListenStep>,
    /// v2.4.0 — the capability scope a daemon's runs are confined to
    /// (`requires: [cap, …]`, the same closed slug grammar as `axonendpoint
    /// requires:`). A scheduled (cron) daemon MUST declare this (it is a
    /// standing autonomous privilege); the enterprise supervisor mints a
    /// per-run principal scoped to EXACTLY these capabilities (least privilege,
    /// v2.4.0). Empty for event-only daemons / pre-v2.4.0 daemons.
    pub requires_capabilities: Vec<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.28.0 — a `budget { … }` block: a set of per-effect rate quotas plus the
/// exhaustion policy. Where `window` guards an effect's TIMING, `budget` guards
/// its RATE — a tool call consumes one token from a renewable bucket, and
/// over-emission is impossible by construction (the Logic pillar's linearity
/// made real for external effects).
#[derive(Debug)]
pub struct BudgetBlock {
    /// v2.69.0 — the budget's NAME when it is declared **top-level**.
    ///
    /// Empty ⇒ the daemon-attached form (`daemon D { budget { … } }`), which is
    /// anonymous and scoped to that daemon's ticks.
    ///
    /// # Why top-level had to exist
    ///
    /// Until v2.69.0, `budget` was a **field of `daemon` and nothing else**. So an
    /// adopter deploying an HTTP endpoint that calls a vendor tool had **no way in
    /// the language to bound how often it does that.** Not "the bound did not
    /// work" — **the bound could not be written.** And the HTTP endpoint is what
    /// people actually deploy.
    pub name: String,
    /// The per-effect quotas (`rate:`/`max:` lines). At least one.
    pub quotas: Vec<BudgetQuota>,
    /// What to do when a quota is exhausted: `block` (fail-closed, the default) |
    /// `defer` (reschedule via the v2.27.0 defer ledger) | `shed` (skip the call).
    pub on_exhausted: String,
    pub loc: Loc,
    /// v2.69.0 — comment trivia, so a top-level `budget` does not silently lose
    /// its doc comments through the formatter (v1.5.2). Empty for the
    /// daemon-attached form.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.28.0 — one quota line of a [`BudgetBlock`]:
/// `<kind>: <limit> per <period> on Tool(<effect>)`.
#[derive(Debug)]
pub struct BudgetQuota {
    /// `rate` (a renewable bucket that refills `limit` tokens per `period`) or
    /// `max` (a windowed hard cap of `limit` per `period`, no intra-window refill).
    pub kind: String,
    /// The token allowance per period (> 0).
    pub limit: i64,
    /// The renewal/window period: `second` | `minute` | `hour` | `day`.
    pub period: String,
    /// The effect this quota governs — a declared `Tool` name (`on Tool(X)`).
    pub effect: String,
    pub loc: Loc,
}

// ── AxonStore ────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct AxonStoreDefinition {
    pub name: String,
    pub backend: String, // in_memory | postgresql | secrets
    /// The DSN — **the field that actually runs today**. `connection:` →
    /// `resolve_dsn` → a real sqlx pool, with no global-pool fallback.
    ///
    /// v2.67.0: still accepted (the live deployment depends on it), but it
    /// **warns**, and a store declared this way is INELIGIBLE for
    /// `lease` / `observe` / `reconcile`. *You cannot govern what you did not
    /// declare.*
    pub connection: String,
    /// v2.67.0 — the `resource` this store runs on. When present, the store
    /// DERIVES its DSN, its **pool size** and its sharing discipline from the
    /// resource. The derivation is the point; a bare reference would be the
    /// nominal link this cycle exists to avoid.
    pub resource_ref: String,
    pub confidence_floor: Option<f64>,
    pub isolation: String, // read_committed | repeatable_read | serializable
    pub on_breach: String, // rollback | raise | log
    /// v1.30.0 (D11) — Pillar IV: the capability slug required to
    /// access this store. Empty = no capability gate. Validated at
    /// parse time against the closed slug grammar (shared with the
    /// v1.23.0 `requires:` grammar).
    pub capability: String,
    /// v2.48.0 — the secret-class prefix of a `backend: secrets`
    /// metadata store (doctrine `rotation_without_revelation`). A
    /// dotted lowercase identifier, e.g. `crm` — the store enumerates
    /// the tenant's secrets whose keys live under `<class>.` (so
    /// `class: crm` covers `crm.hubspot`, `crm.zoho.acct_x`, …).
    /// REQUIRED when `backend: secrets` and FORBIDDEN otherwise
    /// (`axon-T900`): a class-less secrets store would enumerate the
    /// tenant's ENTIRE secret namespace (`llm.*` included) — that
    /// over-broad view is unrepresentable, not discouraged.
    pub class: String,
    /// v1.31.0 (D1) — the OPTIONAL column-schema declaration. Three
    /// closed forms (inline / manifest-ref / env-var); `None` means the
    /// 37.x runtime+deploy path applies verbatim (D5 absolute). The
    /// v1.31.0 / v1.31.0 `StoreColumnProof` pass consumes this; the v1.31.0
    /// CLI exports it. For a `backend: secrets` store this is always
    /// `None` in the AST (declaring one is `axon-T900`) — the fixed
    /// metadata schema is synthesized at IR time
    /// (`store_schema::secrets_metadata_schema`).
    pub column_schema: Option<crate::store_schema::StoreColumnSchema>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── AxonEndpoint ─────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct AxonEndpointDefinition {
    pub name: String,
    pub method: String, // GET | POST | PUT | DELETE
    pub path: String,
    pub body_type: String,
    pub execute_flow: String,
    pub output_type: String,
    pub shield_ref: String,
    /// v2.38.0 — the `cors: <Name>` reference, or `""` if absent
    /// (the design decision: absent ⇒ no CORS headers, ever — secure by default). Same
    /// empty-string sentinel convention as `shield_ref`, not `Option`.
    pub cors_ref: String,
    pub retries: Option<i64>,
    pub timeout: String,
    /// ESK — regulatory coverage on the boundary.
    pub compliance: Vec<String>,
    /// v1.21.0 — HTTP wire transport for the response. Closed enum
    /// per D2 ratified 2026-05-10: {"json" | "sse" | "ndjson"}.
    /// Default "json" (D1 — backwards-compat preserved). When set
    /// to "sse", the type-checker (30.c) verifies that
    /// `execute_flow` produces a Stream<T> (D3).
    pub transport: String,
    /// v1.21.0 — Keepalive comment interval for SSE transport (D6).
    /// Optional; default applied at runtime when transport == "sse"
    /// (default 15s). Closed enum at parse time:
    /// {"5s" | "15s" | "30s" | "60s"}. Empty string means
    /// "use runtime default".
    pub keepalive: String,
    /// v1.22.0 — Type-Driven Wire Inference (D1, D7).
    /// `transport_explicit` is `true` if the source declared
    /// `transport:` explicitly (any of json/sse/ndjson). `false` if
    /// the field was omitted, in which case `transport` reflects the
    /// D1 default `"json"` but `implicit_transport` (computed by the
    /// `axon_frontend::type_checker::compute_implicit_transports`
    /// pass) carries the inferred value.
    pub transport_explicit: bool,
    /// v1.22.0 — Inferred wire transport per D1:
    ///   implicit_transport(E) =
    ///     declared_transport(E)   if transport_explicit
    ///     "sse"                    if produces_stream(execute_flow) ∧ ¬explicit
    ///     "json"                   otherwise
    /// Empty string `""` before the type-checker runs. The Python
    /// reference implementation in `axon/compiler/type_checker.py`
    /// sets the field byte-identically (D7 cross-stack contract).
    pub implicit_transport: String,
    /// v1.23.0 (D8) — Auth scope: capability slugs the request
    /// bearer must hold for the endpoint to dispatch. Empty vec
    /// means "no auth gate" (D9 backwards-compat). Slug grammar
    /// (closed): `^[a-z][a-z0-9_]*(\.[a-z][a-z0-9_]*)*$`. Examples:
    /// `admin`, `legal.read`, `hipaa.phi.read`. The runtime checks
    /// declared_requires ⊆ token_capabilities (AND semantics — every
    /// declared capability must be present in the bearer's claims).
    pub requires_capabilities: Vec<String>,
    /// v2.44.0 — `public: true` is the EXPLICIT authorization-coverage
    /// opt-out (doctrine `every_boundary_is_guarded`). An `axonendpoint`
    /// compiles iff it is covered by ≥1 discipline (`requires:` / `shield:` /
    /// `compliance:`) OR declares `public: true`. Omitting BOTH is a hard
    /// error (`axon-T890`, v2.44.0) — this is what closes Modo 1 (a guard
    /// bypassable by silent omission). `public: true` does NOT bypass HTTP
    /// authentication (the enterprise `require_auth` middleware is a
    /// SEPARATE concern); it declares — deliberately + auditably — that the
    /// endpoint carries no capability/shield/compliance coverage. Default
    /// `false` (parser + programmatic construction); the v2.44.0 rule reads it.
    pub public: bool,
    /// v1.23.0 — Replay-token binding (D9 plan-vivo).
    /// `replay_explicit` is `true` when the source declared `replay:`
    /// explicitly. `false` when the field was omitted, in which case
    /// `replay` reflects the method-default (POST/PUT → true, GET/
    /// DELETE → false) computed at deploy time. When the effective
    /// value resolves to `true`, every successful 2xx response is
    /// recorded in the runtime's axonendpoint replay log keyed by
    /// trace_id; auditors retrieve it via GET /v1/replay/<trace_id>.
    pub replay_explicit: bool,
    pub replay: bool,
    /// v1.28.0 — Selected SSE wire-format dialect.
    ///
    /// Populated when the source uses the parametrized grammar
    /// `transport: sse(<dialect>)`. Closed catalog
    /// (`AXONENDPOINT_TRANSPORT_DIALECTS`): `{axon, openai, anthropic}`.
    /// Empty string `""` when:
    ///   - the source declared a non-SSE transport (`json`/`ndjson`), OR
    ///   - the source declared bare `transport: sse` without parens, OR
    ///   - the source omitted `transport:` entirely (D1 implicit path).
    ///
    /// When empty + the effective wire is SSE (per the runtime
    /// classifier `classify_dynamic_route_wire`), the runtime
    /// resolves the dialect via the Q1 algebraic-effect-driven
    /// default: openai for tool-streaming flows (algebraic predicate
    /// true), axon for type-annotation-only flows (algebraic predicate
    /// false). D3 explicit `transport: sse(<dialect>)` overrides the
    /// default.
    pub transport_dialect: String,
    /// v1.27.1 — Algebraic-effect override predicate.
    ///
    /// `true` when `execute_flow` references a tool that declares
    /// `effects: <stream:<policy>>` (v1.21.0 algebraic-effect surface).
    /// Mirrors `type_checker::flow_uses_streaming_tool(execute_flow, program)`.
    ///
    /// Used by the runtime classifier
    /// (`axon_server::classify_dynamic_route_wire`) to OVERRIDE the
    /// v1.22.0 D6 backwards-compat gate: a tool with a declared stream
    /// effect is a LANGUAGE-LEVEL commitment to streaming, not a
    /// client preference. When this field is `true` AND
    /// `transport: json` is NOT explicitly declared (D3 opt-out remains
    /// sacred), the route wire is unconditionally `Sse` — no
    /// `Accept: text/event-stream` header required, no
    /// `AXON_STRICT_TYPE_DRIVEN_TRANSPORT=1` runtime flag required.
    ///
    /// Computed in lockstep with `implicit_transport` by the
    /// `compute_implicit_transports` pass. Default `false` before the
    /// pass runs (matches AST construction defaults; D9 backwards-
    /// compat preserved for older AST consumers).
    pub has_algebraic_stream_effect: bool,
    /// v1.31.0 (D2) — the declared execution backend for the flow
    /// behind this endpoint. Empty string `""` means "not declared"
    /// (the endpoint resolves its backend down the v1.31.0 D1
    /// precedence ladder — server default → environment-available
    /// `auto`). When non-empty the parser has validated it against the
    /// closed catalog [`crate::parser::AXONENDPOINT_BACKEND_VALUES`]
    /// and the type-checker rejects an unknown name as a compile
    /// error. A declared `backend:` is rung 2 of the resolution
    /// contract.
    pub backend: String,
    /// v1.32.0 (D1) — Path parameter names extracted from the
    /// `path:` string at parse time. For `path: "/api/tenants/{tenant_id}/secrets/{secret_name}"`
    /// this is `["tenant_id", "secret_name"]`. Empty Vec when the
    /// path has no `{name}` placeholders (D5 backwards-compat — an
    /// endpoint without path params produces byte-identical IR to
    /// v1.38.4).
    ///
    /// Names are deduplicated + recorded in declaration order. A
    /// duplicate `{tenant_id}` in the same path is a parse error
    /// (HTTP route patterns reject duplicates structurally — `axum`
    /// would panic at registration). Type binding is always `Text`
    /// in v1.38.5 (HTTP path-segment convention); a future v1.32.0
    /// may add per-placeholder type-override grammar `{tenant_id: Uuid}`.
    ///
    /// The v1.32.0 D2 totality check (extended by 37.y D3) treats
    /// every name here as covering an equivalent flow parameter
    /// declared `Text`. Collision with a body field of the same name
    /// is a compile error (`axon-T901`, D4).
    pub path_params: Vec<String>,
    /// v1.32.0 (D2) — Query parameters declared via the inline
    /// `query: { name: Type, name: Type? }` block on the endpoint.
    /// Empty Vec when the source omits the block (D5 backwards-compat).
    ///
    /// Closed type catalog (parser-enforced):
    /// `{Text, Int, Float, Bool, Uuid}`. The runtime receives every
    /// query value as a textual `String` and binds it to the same-named
    /// flow parameter; the closed catalog enables future per-type
    /// parsing/validation without breaking the manifest format.
    ///
    /// The optional flag (`?` suffix in the source) reuses
    /// `TypeExpr.optional`. An optional query param need not be
    /// covered by a flow parameter (D3 totality is over required
    /// params); a required query param missing from the flow signature
    /// is a `axon-T?nn` future arm. For v1.38.5 the totality check
    /// treats every query param as a binding-source candidate for any
    /// same-named flow param.
    ///
    /// Reusing `TypeField` (shared with body type declarations) keeps
    /// the D2 totality check uniform — the same `field.type_expr.name
    /// == param.type_expr.name` comparator works for body fields AND
    /// query params.
    pub query_params: Vec<TypeField>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Import ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct ImportNode {
    pub module_path: Vec<String>,
    pub names: Vec<String>,
    /// v2.76.0 — the `@allow_downgrade` ECC valve: acknowledges an
    /// epistemic downgrade across this import edge (silences `axon-W017`,
    /// downgrades `axon-T954` to a *visible* `axon-W017`). `false` for
    /// every import written before v2.76.0.
    pub allow_downgrade: bool,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Persona ──────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct PersonaDefinition {
    pub name: String,
    pub domain: Vec<String>,
    pub tone: String,
    pub confidence_threshold: Option<f64>,
    pub cite_sources: Option<bool>,
    pub refuse_if: Vec<String>,
    pub language: String,
    pub description: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Context ──────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct ContextDefinition {
    pub name: String,
    pub memory_scope: String,
    pub language: String,
    pub depth: String,
    pub max_tokens: Option<i64>,
    pub temperature: Option<f64>,
    pub cite_sources: Option<bool>,
    /// v2.46.0 — the conversational frame's declared cognitive timezone
    /// (IANA name). Every step running within this context carries the run's
    /// captured instant rendered in this zone, unless the step declares its
    /// own `now:` override. Format-checked (`axon-T892`); `None` → no
    /// temporal injection (back-compat).
    pub now_tz: Option<String>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Anchor ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct AnchorConstraint {
    pub name: String,
    pub require: String,
    pub reject: Vec<String>,
    pub enforce: String,
    pub description: String,
    pub confidence_floor: Option<f64>,
    pub unknown_response: String,
    pub on_violation: String,
    pub on_violation_target: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Memory ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct MemoryDefinition {
    pub name: String,
    pub store: String,
    pub backend: String,
    pub retrieval: String,
    pub decay: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Tool ─────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct ToolDefinition {
    pub name: String,
    pub provider: String,
    pub max_results: Option<i64>,
    pub filter_expr: String,
    pub timeout: String,
    pub runtime: String,
    /// v2.69.0 — the `resource` this tool's channel runs on (`tool T { resource: Api }`).
    ///
    /// When present, the tool DERIVES its endpoint from `resource.endpoint`, its
    /// concurrency bound from `resource.capacity`, and (via `lease`/`observe`) its
    /// lifecycle and health from the resource. `runtime:` then names the PATH
    /// within that channel, not the channel itself.
    ///
    /// This is what governs `tool.runtime` — the third island. An absolute
    /// `runtime: "https://…"` (a production URL in source, with no lifetime, no
    /// capacity, no shield) is now refused; the address lives on the resource.
    ///
    /// Empty ⇒ the legacy form (slug `runtime:` joined onto a per-tenant base URL,
    /// which already conforms). Ungoverned, and therefore ineligible for the
    /// channel `shield` / `lease` / `observe`.
    pub resource_ref: String,
    pub sandbox: Option<bool>,
    pub effects: Option<EffectRow>,
    /// v2.8.0 — the tool's typed INPUT SCHEMA (W2: the caller↔tool
    /// contract). Each entry is a named, typed parameter that the canonical
    /// `use Tool(k = v, …)` invocation binds against and the type-checker
    /// validates the caller's args against (CT-2 caller blame, pre-HTTP).
    /// Empty for a schema-less tool — the legacy single-`on <arg>` form still
    /// applies (v2.8.0 D5 back-compat). Reuses `Parameter` (same `TypeExpr`
    /// grammar as flow params).
    pub parameters: Vec<Parameter>,
    /// v4.3.0 — the shield that covers the κ of this tool's `parameters:`.
    /// A tool is how an AXON program talks to anything outside it, which
    /// makes it the widest exit the language has; `axon-T1221` requires this
    /// when a parameter's type carries a regulatory class.
    pub shield_ref: String,
    /// v2.8.0 — the tool's declared OUTPUT type, so a tool-step's result
    /// is referenceable as `${Step.output}` with a real type (v2.8.0 D8). Flat
    /// string (mirrors step `output:`); `None` when undeclared.
    pub output_type: Option<String>,
    /// v2.77.0 — the authorization scopes this tool's operation
    /// requires (`requires: ["w_organization_social"]`): flat capability atoms,
    /// the same vocabulary as `credential.grants` (v2.46.0) and endpoint
    /// `requires_capabilities` (v2.4.0). `axon-T956` enforces subset coverage —
    /// every `use` of a tool with a non-empty `requires` must occur where the
    /// program's granted set covers it. Empty = no scope demand (every
    /// pre-v2.77.0 tool, unchanged). Flat SETS by design: OAuth scopes are
    /// per-platform atoms with no hierarchy — a scope tree would model
    /// structure the domain does not have.
    pub requires: Vec<String>,
    /// v2.48.0 — the per-tenant secret KEY injected into every dispatch
    /// of this tool (doctrine `rotation_without_revelation`): at `use`
    /// time the runtime resolves the key against the tenant's secret
    /// custody and injects the value into the tool-server request under
    /// the reserved `axon_secret` field — the flow never touches it. The
    /// v2.37.0 posture extended to tools: this is a config KEY, never a
    /// credential literal (`axon-T902`, the T850 charset mirror). Empty =
    /// no injection (every pre-v2.48.0 tool). Meaningless on a
    /// `target:`-bound technician tool (execve dispatch, no HTTP request
    /// to inject into) — declaring both is `axon-T902`.
    pub secret: String,
    /// v2.49.0 — the `secret_partition:` field (doctrine
    /// `selection_without_revelation`): the name of one of THIS tool's own
    /// `parameters:` whose runtime value is appended as a single key
    /// SEGMENT to `secret:` at dispatch, so one tool serves N sub-tenants
    /// multiplexed under one axon-tenant. With `secret: crm.hubspot` and
    /// `secret_partition: tenant_id`, a `use CrmCrearContacto(tenant_id =
    /// "acme", …)` resolves the custody key `crm.hubspot.acme`. The
    /// `secret:` class prefix is pinned at compile time (a literal); only
    /// this bounded segment is dynamic — the resolved key can NEVER leave
    /// the tool's declared class (the segment is charset-checked to a
    /// single dot-free run at dispatch, fail-closed). Empty = the v2.48.0
    /// static-key behaviour, unchanged. `axon-T903` governs its laws:
    /// requires a non-empty `secret:`, must name a `String` parameter of
    /// this tool, forbidden on a technician tool. The value SELECTED is
    /// still never revealed to cognition — `secret_partition` chooses
    /// WHICH borrowed authority to spend, never reads it.
    pub secret_partition: String,
    /// v2.39.0 — Remote Hands. The `socket` this technician tool dispatches
    /// over: a program acting on a real machine dials `axon` as a `socket`
    /// client, and a `target:`-bound tool call sends its rendered argv down
    /// that connection. `None` ⇒ today's unchanged in-process / model-surface
    /// behaviour (zero regression; the whole v2.39.0 surface is inert unless
    /// `target:` is set). Resolved to a declared `socket` and duality-checked
    /// by `axon-T861`.
    pub target: Option<String>,
    /// v2.39.0 — the operation's risk class, a v1-closed catalog of exactly
    /// `safe | destructive` (`technician::VALID_RISK_LEVELS`). `destructive`
    /// forces the bound session to carry a reachable `branch{approved/denied}`
    /// confirmation (`axon-T860`). `None` on a non-technician tool.
    pub risk: Option<String>,
    /// v2.39.0 — the **argv template**: an ordered list of argv elements,
    /// each either a literal token (`"ping"`, `"-c"`) or a *whole-element*
    /// `${param}` placeholder (`"${host}"`). A placeholder binds to a declared
    /// `parameters:` entry and is substituted as ONE opaque argv argument at
    /// dispatch — never concatenated, never re-parsed by a shell. This
    /// is the injection-safety keystone: the market's free `template:` STRING
    /// is deliberately NOT offered. Empty for a non-technician tool; required
    /// (`axon-T858`) when `target:` is set on a `provider: bash` tool.
    pub argv: Vec<String>,
    /// v2.40.0 — the result-memoization policy for this tool. Names a
    /// declared `cache` (`axon-T864`), or the reserved sentinel `none` to opt
    /// OUT of an active `cache { default: true }` policy (the escape hatch for
    /// a rare mislabeled-`pure` tool). Empty ⇒ governed by the module default
    /// if one exists and this tool is eligible (`pure`, or covered by the
    /// default's `apply_to_effects`). Distinct from `memory`.
    pub cache: String,
    /// v2.52.0 — Native Web Acquisition. The closed-catalog scrape
    /// configuration for a tool whose `provider:` is one of the three
    /// web-acquisition engines (`scrape_http` | `scrape_dom` |
    /// `scrape_crawl`). `None` ⇒ this is not a scrape tool — the entire
    /// v2.52.0 surface is inert (zero regression). Present ⇒ the tool acquires
    /// content from the OPEN, ADVERSARIAL web: its output is born
    /// epistemically Untrusted (⊥, the design decision) and its `effects:` row MUST
    /// carry the first-class `web` base (`axon-T904`, effect honesty).
    /// The sub-block is a closed catalog — an unknown field is a hard
    /// parse error (the v2.38.0/v2.39.0 discipline, the design decision).
    pub scrape: Option<ScrapeSpec>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.52.0 — the closed-catalog scrape configuration block
/// (`scrape: { … }`) on a web-acquisition `tool`. Every field is
/// optional/defaulted so a minimal `scrape: {}` is legal; the fields
/// that apply depend on the tool's `provider:` (the type-checker cross-
/// validates provider ↔ field applicability, `axon-T905`). The whole
/// struct is deliberately flat + serializable-friendly (`Option`/`Vec`/
/// scalar), mirroring the v2.39.0 technician-field discipline, so the IR
/// stays byte-stable and the runtime classifies identically.
#[derive(Debug, Default)]
pub struct ScrapeSpec {
    /// The acquisition engine: `impersonate` (HTTP-fingerprint stealth,
    /// the GA tier) | `browser` (headless-render sidecar, the gray tier).
    /// `None` ⇒ `impersonate`. Closed catalog (`axon-T905`).
    /// Applies to `scrape_http` / `scrape_crawl`.
    pub engine: Option<String>,
    /// The browser-fingerprint impersonation PROFILE name
    /// (`chrome`, `firefox`, `safari` — closed catalog). Only meaningful
    /// with `engine: impersonate`. The concrete JA3/JA4 + HTTP/2 profile
    /// is resolved by the enterprise engine (v2.52.0); OSS records the
    /// declared intent. `None` ⇒ the engine's default profile.
    pub impersonate: Option<String>,
    /// The post-navigation settle wait for `engine: browser` (a Duration,
    /// e.g. `2s`) — how long to let JS render before snapshotting. Bounded
    ///. Ignored by the impersonate engine (no JS runtime).
    pub render_wait: Option<String>,
    /// The per-tenant proxy-pool config KEY (a dotted key, resolved via
    /// the same SecretResolver `secret:`/`tool.base_url` use — the design decision),
    /// never a proxy URL literal. Empty ⇒ direct connection.
    pub proxy: String,
    /// Whether `robots.txt` is honored (default TRUE, the design decision). Setting
    /// `respect_robots: false` is the audited, `scrape.aggressive`-gated
    /// override (enforced enterprise-side, v2.52.0); in OSS it is recorded.
    pub respect_robots: Option<bool>,
    /// `scrape_dom` extraction spec: an ordered list of `name=selector`
    /// FieldSpecs (`["title=h1", "price=.amount"]`). A closed, bracketed
    /// string list (reuses the v2.38.0/v2.39.0 list helper). Each entry must be a
    /// single `name=selector` pair (`axon-T906`).
    pub extract: Vec<String>,
    /// `scrape_dom` adaptive relocation: when a declared selector misses,
    /// the engine attempts a HEURISTIC relocation above `similarity_floor`
    /// (the design decision — a heuristic, NOT a proof). `None`/`false` ⇒ strict
    /// selectors only. Enabling it makes the tool carry `<storage>` (the
    /// per-tenant selector-memory, v2.52.0).
    pub adaptive: Option<bool>,
    /// The similarity threshold ∈ [0,1] governing adaptive relocation
    /// (`axon-T907`). Only meaningful with `adaptive: true`.
    pub similarity_floor: Option<f64>,
    /// `scrape_crawl` link-follow selector/pattern: which links to enqueue
    /// from each fetched page. Empty ⇒ no expansion (single-page crawl).
    pub follow: String,
    /// `scrape_crawl` maximum link depth from the seed (bounded, the design decision).
    pub max_depth: Option<i64>,
    /// `scrape_crawl` maximum total pages fetched (bounded, the design decision). A
    /// hostile/infinite site can never exhaust the crawler (`axon-T908`).
    pub max_pages: Option<i64>,
    /// `scrape_crawl` fetch concurrency (bounded, ≥ 1).
    pub concurrency: Option<i64>,
    /// `scrape_crawl` politeness/rate reference: a declared `budget`
    /// (`budget{rate:/max:}`, v2.28.0) governing per-host request pacing
    /// (D98 reuse of the budget kernel). Empty ⇒ engine default pacing.
    pub politeness: String,
    /// `scrape_crawl` checkpoint store reference: a declared `axonstore`
    /// the crawler persists frontier/visited state into for resumable,
    /// at-least-once crawling. Empty ⇒ in-memory (non-resumable).
    pub checkpoint: String,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct EffectRow {
    pub effects: Vec<String>,
    pub epistemic_level: String,
    pub loc: Loc,
}

// ── Type ─────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct TypeDefinition {
    pub name: String,
    pub fields: Vec<TypeField>,
    pub range_constraint: Option<RangeConstraint>,
    pub where_clause: Option<WhereClause>,
    /// ESK — κ regulatory class attached to a type.
    pub compliance: Vec<String>,
    /// v4.5.0 — WHAT this type is, from the closed identifier catalogue.
    ///
    /// κ says which regime a value falls under; this says whether it is a
    /// social-security number or a clinical note. De-identification needs the
    /// second question answered — a rule that can only see the regime can
    /// check that a class was declared and nothing about what was removed.
    ///
    /// Empty for the ordinary case: most types are not identifiers.
    pub identifier: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

#[derive(Debug, Clone)]
pub struct TypeExpr {
    pub name: String,
    pub generic_param: String,
    pub optional: bool,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct TypeField {
    pub name: String,
    pub type_expr: TypeExpr,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct RangeConstraint {
    pub min_value: f64,
    pub max_value: f64,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct WhereClause {
    pub expression: String,
    pub loc: Loc,
}

// ── Flow ─────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct FlowDefinition {
    pub name: String,
    pub parameters: Vec<Parameter>,
    pub return_type: Option<TypeExpr>,
    pub body: Vec<FlowStep>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

#[derive(Debug)]
pub struct Parameter {
    pub name: String,
    pub type_expr: TypeExpr,
    pub loc: Loc,
}

/// Statements that can appear inside a flow body.
#[derive(Debug)]
pub enum FlowStep {
    Step(StepNode),
    If(ConditionalNode),
    ForIn(ForInStatement),
    Let(LetStatement),
    Return(ReturnStatement),
    /// v1.14.0 — `break` keyword. Payload-free; carries only its
    /// source location for error reporting.
    Break(BreakStatement),
    /// v1.14.0 — `continue` keyword. Payload-free; same shape as
    /// `Break`.
    Continue(ContinueStatement),
    /// Lambda Data application in a flow step.
    LambdaDataApply(LambdaDataApplyNode),
    // ── Tier 2 flow steps ──
    Probe(ProbeStep),
    Reason(ReasonStep),
    Validate(ValidateStep),
    Refine(RefineStep),
    Weave(WeaveStep),
    UseTool(UseToolStep),
    Remember(RememberStep),
    Recall(RecallStep),
    Par(ParBlock),
    Hibernate(HibernateStep),
    Deliberate(DeliberateBlock),
    Consensus(ConsensusBlock),
    Forge(ForgeBlock),
    Focus(FocusStep),
    /// v2.65.0 — the proof-carrying derivative step.
    Grad(GradStep),
    Associate(AssociateStep),
    Aggregate(AggregateStep),
    ExploreStep(ExploreStepNode),
    Ingest(IngestStep),
    ShieldApply(ShieldApplyStep),
    Declassify(DeclassifyStep),
    Stream(StreamBlock),
    /// v2.87.0 — `handle E { … } in { … }`, the delimited handler scope.
    Handle(HandleBlock),
    /// v2.87.0 — `perform Op(args)`. Legal at flow level and inside a step
    /// body (where it lands on [`StepNode::performs`], NOT on `pix_ops`: a
    /// `pix_op` is an ELEVATION that runs BEFORE generation, and a `perform`
    /// whose argument is the step's own output must run AFTER it).
    Perform(PerformStep),
    /// v2.87.0 — `resume(v)`. Clause bodies only.
    Resume(ResumeStep),
    /// v2.87.0 — `abort(v)`. Clause bodies only.
    Abort(AbortStep),
    /// v2.87.0 — `forward Op(args)` (D12). Clause bodies only.
    Forward(ForwardStep),
    Navigate(NavigateStep),
    Drill(DrillStep),
    Trail(TrailStep),
    Corroborate(CorroborateStep),
    OtsApply(OtsApplyStep),
    MandateApply(MandateApplyStep),
    ComputeApply(ComputeApplyStep),
    /// v2.83.0 — `<Agent>(arg, …)`, the step-body invocation of a
    /// declared agent. Dispatches v2.83.0's bounded control loop.
    AgentCall(AgentCallStep),
    Listen(ListenStep),
    DaemonStep(DaemonStepNode),
    /// v1.6.0 — π-calculus output prefix `c⟨v⟩.P` (Chan-Output / Chan-Mobility).
    Emit(EmitStatement),
    /// v2.46.0 — `mint <Credential> as <binding>`: ephemeral-credential
    /// minting (attenuated, TTL-bounded; `authority_only_attenuates`).
    Mint(MintStep),
    /// v2.48.0 — `rotate <SecretsStore> [where "…"] with <Tool> as
    /// <binding>`: mediated secret renewal (`rotation_without_revelation`).
    Rotate(RotateStep),
    /// v1.6.0 — capability extrusion (Publish-Ext, paper section 4.3).
    Publish(PublishStatement),
    /// v1.6.0 — dual of publish (dynamic typed handle import).
    Discover(DiscoverStatement),
    Persist(PersistStep),
    Retrieve(RetrieveStep),
    Mutate(MutateStep),
    Purge(PurgeStep),
    Transact(TransactBlock),
    /// v2.43.0 — `warden(<target>) within <Scope> { … }` adversarial
    /// security-analysis block. A flow-body block (like `quant`): a target
    /// reference + a mandatory `within <Scope>` authorization clause + a nested
    /// body (`find_exploits()` → `list[Vulnerability]`, `fortify`). NOT a
    /// top-level declaration.
    Warden(WardenBlock),
    /// v2.4.0 — `quant { … }` cognitive block (Hilbert-space projection).
    /// Carries an optional attribute header + a real nested body of flow steps
    /// (so v2.4.0's Continuous Type Invariant can scan it). Lives inside a flow
    /// body like `par`; NOT a top-level declaration.
    Quant(QuantBlock),
    /// v2.4.0 — `yield <expr>` measurement point inside a `quant` block.
    /// Collapses the evolved amplitudes back to classical silicon; the effect
    /// operation whose resolution is a one-shot delimited continuation. Only
    /// well-formed inside a `quant` block (the checker rejects it elsewhere).
    Yield(YieldStatement),
    /// v2.4.0 — `run <Flow>(args)` as a flow-step: invoke a declared flow
    /// from inside a body (notably a `daemon`'s `listen` handler — the Q3 ask).
    /// Reuses the top-level [`RunStatement`] shape (flow name + args + optional
    /// persona/context/anchors). Distinct from `Declaration::Run` only by
    /// position (a step inside a body vs. a program-root run).
    Run(RunStatement),
    /// Flow-level statements we recognize but parse structurally.
    GenericStep(GenericFlowStep),
}

/// A flow step we recognize by keyword but parse only structurally.
#[derive(Debug)]
pub struct GenericFlowStep {
    pub keyword: String,
    pub loc: Loc,
}

// ── Step ─────────────────────────────────────────────────────────────────────

/// v2.83.0 — a governance application written INSIDE the step it
/// governs: `mandate SECCompliance on data`, `shield PatientShield on symptoms
/// -> clean_data`, `ots Extract on raw`.
///
/// README XV has always written the application in this position — a mandate
/// next to the `output:` it constrains, scoped to THIS step's generation — and
/// the parser accepted the same form only at flow level, which is why README
/// blocks 40–42 never compiled. The AST node is deliberately the same shape as
/// the flow-level `*ApplyStep` family: one concept, two positions.
#[derive(Debug)]
pub struct StepGuardNode {
    /// Which primitive: `"mandate"` | `"shield"` | `"ots"`.
    pub kind: String,
    /// The declared governor this guard names (e.g. `SECCompliance`).
    pub name: String,
    /// What it is applied to — a binding or a call expression, verbatim
    /// (`data`, `ContractDrafter(terms)`). Empty when no `on` clause.
    pub target: String,
    /// The binding the guarded result flows into (`-> clean_data`). Empty when
    /// absent.
    pub binding: String,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct StepNode {
    pub name: String,
    pub persona_ref: String,
    pub given: String,
    pub ask: String,
    pub output_type: String,
    pub confidence_floor: Option<f64>,
    pub navigate_ref: String,
    pub apply_ref: String,
    /// v2.22.0 — the step's declared MODEL CAPABILITY requirement: the
    /// context window (in tokens) the cognitive act needs. The v2.22.0 resolver
    /// maps it to the smallest concrete model that satisfies it (per the
    /// resolved backend's v2.22.0 catalog); `None` → the backend default
    /// (back-compat). Declare the NEED, not the vendor SKU.
    pub requires_context: Option<u32>,
    /// v2.46.0 — the step's declared cognitive timezone: an IANA name
    /// (`"America/Bogota"`, `"UTC"`). When present, the runtime injects the
    /// run's captured instant — rendered in THIS zone — into the step's
    /// cognitive context (`time_is_an_explicit_input`, the v2.27.0 doctrine
    /// applied to cognition). Format-checked at compile time (`axon-T892`);
    /// full IANA membership is the runtime's job (chrono-tz, v2.46.0).
    /// Overrides a bound `context`'s `now:` for this step. `None` → no
    /// temporal injection (back-compat).
    pub now_tz: Option<String>,
    /// v2.83.0 — the governance applications declared in this
    /// step's body, in source order. Empty for every pre-v2.83.0 program.
    pub guards: Vec<StepGuardNode>,
    /// v2.83.0 — the STATEMENTS written in this step's body, in source
    /// order: the PIX verbs (`navigate` / `drill` / `trail` / `validate`)
    /// and the step-scoped invocations (`probe … for […]`, `use_tool … with
    /// …`, a bare `<Agent>(args)` call, `par { … }`).
    ///
    /// README's pix/corpus family writes them exactly here, with a braceless
    /// field list, and each produces a binding (`as: relevant_sections`) the
    /// step's own `ask:` then interpolates. So they are ELEVATIONS, the same
    /// shape v2.83.0 gave `lambda`/`ots`: dispatch runs them BEFORE the step's
    /// generation. Reusing the flow-level node types (no new AST shapes) is
    /// the the design decision doctrine — one concept, two positions.
    pub pix_ops: Vec<FlowStep>,
    /// v2.83.0 — a `stream<T> { … }` written in THIS step's body.
    ///
    /// Deliberately NOT a [`Self::pix_ops`] entry, and the distinction is the
    /// whole design. Every `pix_ops` statement is an ELEVATION: dispatch runs it
    /// BEFORE the step generates, so its binding is available to the step's
    /// `ask:`. A stream handler is the opposite — `on_chunk` runs DURING the
    /// step's own output, once per chunk, and there is nothing to elevate.
    ///
    /// Filing it under `pix_ops` would also have produced a specific, silent
    /// bug: README block 15's `step Stream` declares no `ask:` at all, so
    /// `run_step` would have run the handlers as an elevation and then fallen
    /// through to the LLM path with an EMPTY prompt — a real upstream call, made
    /// on nothing, once per run. The field is what tells the dispatcher this
    /// step's output IS the stream.
    pub stream: Option<Box<StreamBlock>>,
    /// v2.87.0 — the `perform Op(args)` statements written in THIS step's
    /// body, in source order.
    ///
    /// A THIRD position, and for the same reason v2.83.0 needed a second one.
    /// `the design plan` section 3.1 publishes:
    ///
    /// ```text
    /// step generate {
    ///     given: prompt
    ///     let response = ask "Generate response"
    ///     perform Emit(response.token)
    ///     perform Done()
    /// }
    /// ```
    ///
    /// The performed argument IS the step's own output. Filing these under
    /// [`Self::pix_ops`] would run them BEFORE generation, so `response.token`
    /// would resolve against a binding that does not exist yet — the handler
    /// would receive an unresolved symbol and the wire would carry a name where
    /// the adopter expected a token. Dispatch runs `performs` AFTER the step
    /// generates, with the step's output in scope.
    pub performs: Vec<PerformStep>,
    pub loc: Loc,
}

// ── Intent ───────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct IntentNode {
    pub name: String,
    pub given: String,
    pub ask: String,
    pub output_type: Option<TypeExpr>,
    pub confidence_floor: Option<f64>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Run ──────────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct RunStatement {
    pub flow_name: String,
    pub arguments: Vec<String>,
    pub persona: String,
    pub context: String,
    pub anchors: Vec<String>,
    pub on_failure: String,
    pub on_failure_params: Vec<(String, String)>,
    pub output_to: String,
    pub effort: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── Epistemic ────────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct EpistemicBlock {
    pub mode: String,
    pub body: Vec<Declaration>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v2.26.0 — the pure expression engine (`Expr`) ─────────────────────────

/// A pure, total expression in AXON's closed-catalog expression sublanguage
/// (v2.26.0). Evaluates to a value with no side effects, no I/O, no recursion
/// and no unbounded loops — so it is decidable and const-foldable. Mounted as
/// the condition of an `if` (and, in later steps, `let` values + `where:`
/// predicates). Field/index access and the builtin catalog land in v2.26.0.
#[derive(Debug, Clone)]
pub enum Expr {
    /// A typed literal (`42`, `3.14`, `true`, `"hello"`).
    Lit(ExprLit),
    /// A reference to a binding or dotted path (`x`, `User.tier`).
    Ref(String),
    /// A unary operation (`-x`, `not x`).
    Unary(UnOp, Box<Expr>),
    /// A binary operation (`a + b`, `a >= b`, `a and b`).
    Binary(BinOp, Box<Expr>, Box<Expr>),
    /// v2.26.0 — a closed-catalog builtin call. `args[0]` is the receiver
    /// (the value before the `.`); any further entries are the call arguments.
    /// E.g. `recent.length` → `Call(Length, [Ref("recent")])`,
    /// `name.starts_with("Dr")` → `Call(StartsWith, [Ref("name"), Lit(Str)])`.
    Call(Builtin, Vec<Expr>),
    /// v2.26.0 — field access on a non-reference base (`items[0].name`,
    /// `(expr).field`). A plain dotted path stays a `Ref` (`a.b.c`) for
    /// back-compat; this node is the structured form the JSONB SQL lowering
    /// (deferred v2.26.0) consumes. The `String` is the field name.
    Field(Box<Expr>, String),
    /// v2.26.0 — index access `base[index]` (array element / string char).
    Index(Box<Expr>, Box<Expr>),
    /// v2.83.0 — `let <name> = <value>` scoped over `<body>`: the classic
    /// let-in term, `let x = e₁ in e₂`.
    ///
    /// **Why the expression engine and not a list of bindings on the compute.**
    /// Every published `compute` writes a CHAIN —
    /// `logic { let a = …  let b = …  return e }` — and the obvious shortcut is
    /// to hang a `Vec<(String, Expr)>` off `ComputeDefinition` and substitute at
    /// evaluation time. That is wrong twice over: substitution DUPLICATES the
    /// bound term at every use site (so `let t = expensive()` evaluates once per
    /// mention, changing cost and, for anything non-total, meaning), and it
    /// confines `let` to computes when it is a property of expressions.
    ///
    /// As a `Let` term the chain nests — `Let(a, e₁, Let(b, e₂, e₃))` — which is
    /// exactly one evaluation per binding, shadowing that falls out of the
    /// nesting instead of being reimplemented, and a `let` usable anywhere an
    /// expression is.
    Let {
        name: String,
        value: Box<Expr>,
        body: Box<Expr>,
    },
}

/// The closed catalog of pure builtins (v2.26.0). All are total + pure.
/// Collection/string predicates only; the predicate-taking folds (`any`/`all`/
/// `none`) need lambdas and are deferred, as are `sum`/`min`/`max` and `in`/`??`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Builtin {
    /// `.length` — collection element count, or character count of a string.
    Length,
    /// `.count` — alias of `length`.
    Count,
    /// `.is_empty` — `length == 0`.
    IsEmpty,
    /// `.is_null` — the value is absent / empty / `null`.
    IsNull,
    /// `.contains(x)` — array membership, or string substring.
    Contains,
    /// `.starts_with(s)` — string prefix test.
    StartsWith,
    /// `.ends_with(s)` — string suffix test.
    EndsWith,
    /// v2.26.0 — `.as_int` — honest coercion of a `Json` value to an
    /// integer. Fail-closed: a value that is not a JSON integer resolves
    /// to `null`, never a panic (doctrine `open_data_is_total`).
    AsInt,
    /// v2.26.0 — `.as_float` — honest coercion to a float (an integer
    /// widens; anything else → `null`).
    AsFloat,
    /// v2.26.0 — `.as_string` — honest coercion to a string (only a
    /// JSON string succeeds; a number / bool / null → `null`).
    AsString,
    /// v2.26.0 — `.as_bool` — honest coercion to a boolean (only a
    /// JSON bool succeeds; anything else → `null`).
    AsBool,
}

impl Builtin {
    /// The number of arguments AFTER the receiver (`args[0]`).
    pub fn extra_arity(self) -> usize {
        match self {
            Builtin::Length
            | Builtin::Count
            | Builtin::IsEmpty
            | Builtin::IsNull
            | Builtin::AsInt
            | Builtin::AsFloat
            | Builtin::AsString
            | Builtin::AsBool => 0,
            Builtin::Contains | Builtin::StartsWith | Builtin::EndsWith => 1,
        }
    }

    /// The surface name (after the `.`).
    pub fn surface(self) -> &'static str {
        match self {
            Builtin::Length => "length",
            Builtin::Count => "count",
            Builtin::IsEmpty => "is_empty",
            Builtin::IsNull => "is_null",
            Builtin::Contains => "contains",
            Builtin::StartsWith => "starts_with",
            Builtin::EndsWith => "ends_with",
            Builtin::AsInt => "as_int",
            Builtin::AsFloat => "as_float",
            Builtin::AsString => "as_string",
            Builtin::AsBool => "as_bool",
        }
    }

    /// Resolve a name (after a `.`) to a builtin, or `None` if it is an ordinary
    /// field / path segment.
    pub fn from_name(name: &str) -> Option<Builtin> {
        Some(match name {
            "length" => Builtin::Length,
            "count" => Builtin::Count,
            "is_empty" => Builtin::IsEmpty,
            "is_null" => Builtin::IsNull,
            "contains" => Builtin::Contains,
            "starts_with" => Builtin::StartsWith,
            "ends_with" => Builtin::EndsWith,
            "as_int" => Builtin::AsInt,
            "as_float" => Builtin::AsFloat,
            "as_string" => Builtin::AsString,
            "as_bool" => Builtin::AsBool,
            _ => return None,
        })
    }
}

/// A literal value inside an [`Expr`]. The lexical form is preserved enough to
/// round-trip; the runtime evaluator (v2.26.0) coerces across these per the
/// existing string-runtime discipline.
#[derive(Debug, Clone)]
pub enum ExprLit {
    Int(i64),
    Float(f64),
    Bool(bool),
    Str(String),
}

/// Unary operators (closed catalog).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum UnOp {
    /// Arithmetic negation `-`.
    Neg,
    /// Boolean negation `not`.
    Not,
}

/// Binary operators (closed catalog). Precedence is encoded in the Pratt parser.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum BinOp {
    Add,
    Sub,
    Mul,
    Div,
    Mod,
    Eq,
    Ne,
    Lt,
    Le,
    Gt,
    Ge,
    And,
    Or,
}

// ── Control flow ─────────────────────────────────────────────────────────────

#[derive(Debug)]
pub struct ConditionalNode {
    pub condition: String,
    pub comparison_op: String,
    pub comparison_value: String,
    pub then_body: Vec<FlowStep>,
    pub else_body: Vec<FlowStep>,
    pub conditions: Vec<(String, String, String)>,
    pub conjunctor: String,
    /// v2.26.0 — the parsed expression form of the condition. `None` when
    /// the condition fits the legacy `(condition, op, value)` + `or` shape
    /// (then the legacy fields drive evaluation, byte-identical to pre-v2.26.0);
    /// `Some` only for the richer forms the legacy triple cannot express
    /// (`and`, `not`, arithmetic, parentheses, nesting), which the runtime
    /// evaluates via the pure expression evaluator. Zero IR drift for existing
    /// programs.
    pub cond: Option<Expr>,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct ForInStatement {
    pub variable: String,
    pub iterable: String,
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct LetStatement {
    pub identifier: String,
    pub value_expr: String,
    /// v1.12.0 — preserves the parser's tokenization intent so the
    /// runtime dispatcher can distinguish a quoted literal from a
    /// dotted-identifier reference. One of "literal", "reference",
    /// "expression". Defaults to "literal" so any pre-cycle-17 caller
    /// that constructs a LetStatement directly behaves as a literal.
    pub value_kind: String,
    /// v2.4.0 — optional type annotation `let x: <TypeExpr> = …`.
    /// `None` for the bare `let x = …` form (all pre-51.c.3 lets). Inside a
    /// `quant` block the Continuous Type Invariant inspects this to enforce the
    /// continuous-carrier discipline (`DensityMatrix[D]` D=2ⁿ; reject discrete
    /// conversational types). Carries the typed encoder-boundary contract.
    pub type_annotation: Option<TypeExpr>,
    /// v2.26.0 — the parsed expression form of the value, present only when
    /// `value_kind == "expression"` (`let total = price * qty + tax`). The
    /// runtime evaluates it via the pure expression evaluator instead of the
    /// pre-v2.26.0 behaviour (which treated an expression as an opaque literal
    /// string). `None` for literal / reference / list values (byte-identical to
    /// pre-v2.26.0).
    pub value_ast: Option<Expr>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

#[derive(Debug)]
pub struct ReturnStatement {
    pub value_expr: String,
    pub loc: Loc,
}

/// v2.4.0 — `yield <expr>` measurement point inside a `quant` block.
#[derive(Debug)]
pub struct YieldStatement {
    /// The measured expression (the structural hypothesis / density-matrix
    /// surrogate collapsed out of the Hilbert-space scope).
    pub value_expr: String,
    /// Tokenization intent (`literal` / `reference` / `expression`), mirroring
    /// `LetStatement.value_kind` so the runtime resolves the yielded value.
    pub value_kind: String,
    pub loc: Loc,
}

/// v1.14.0 — `break` keyword inside a for-in body. Carries no
/// payload; the runner translates it into a sentinel that
/// terminates the loop. Parser scope check (`loop_depth`)
/// guarantees this only appears inside a for-in body.
#[derive(Debug)]
pub struct BreakStatement {
    pub loc: Loc,
}

/// v1.14.0 — `continue` keyword inside a for-in body. Same
/// shape as ``BreakStatement``; the runner uses a different
/// sentinel type to distinguish loop-exit from iteration-skip.
#[derive(Debug)]
pub struct ContinueStatement {
    pub loc: Loc,
}

// ── Lambda Data (ΛD) — Epistemic State Vectors ─────────────────────────────

/// Top-level ΛD definition: ψ = ⟨T, V, E⟩ where E = ⟨c, τ, ρ, δ⟩.
#[derive(Debug)]
pub struct LambdaDataDefinition {
    pub name: String,
    pub ontology: String,             // T ∈ O — ontological type
    pub certainty: f64,               // c ∈ [0,1] — epistemic certainty scalar
    pub temporal_frame_start: String, // τ_start
    pub temporal_frame_end: String,   // τ_end
    pub provenance: String,           // ρ ∈ EntityRef — causal origin
    pub derivation: String, // δ ∈ Δ — see derivation catalogue (raw, derived, inferred, aggregated, transformed)
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// In-flow ΛD application: binds epistemic state vector to a data target.
#[derive(Debug)]
pub struct LambdaDataApplyNode {
    pub lambda_data_name: String, // reference to LambdaDataDefinition
    pub target: String,           // expression to bind
    pub output_type: String,      // result type after epistemic binding
    pub loc: Loc,
}

// ── Tier 2 flow step nodes ──────────────────────────────────────────────────

#[derive(Debug)]
pub struct ProbeStep {
    pub target: String,
    /// v2.83.0 — the extraction list README writes:
    /// `probe doc for [parties, obligations, dates]`. Pre-v2.83.0 the step
    /// body reached `probe` and ran `skip_flow_step_structural`, which
    /// DISCARDED it (the v2.67.0 silent-drop shape); the flow-level form kept
    /// only the target and never had a slot for the fields at all.
    pub fields: Vec<String>,
    pub loc: Loc,
}
/// v2.83.0 — `reason { given: … ask: "…" depth: N }`, the README's
/// most-published cognitive block (16 occurrences) and, until this cycle, the
/// most expensive silent drop in the language.
///
/// **What was wrong.** The block form had NO home in this struct: `strategy`
/// and `target` were its only fields. Written at flow level, `reason { … }`
/// did not parse at all (the parser wanted `reason <target>`); written inside a
/// `step { }` body — the only place the README ever writes it — it hit
/// `skip_flow_step_structural`, which threw the whole block away. Measured on
/// 2.85.0: a step whose ENTIRE cognition was a `reason { given ask depth }`
/// block passed `axon check` with exit 0 and lowered to `"ask": ""`,
/// `"given": ""`. `advertised.rs` attested `reason` as
/// `Real { proof: "pure_shape::run_reason" }` — and the attestation was true
/// of an engine no published program could reach. v2.67.0's own words: motor
/// real, cable muerto.
///
/// The field set is CLOSED (v2.83.0's rule: when a block skips what it does
/// not recognise, ask which direction the silence fails in — a typo'd `ask:`
/// yields a promptless deliberation, which is weaker, not louder).
#[derive(Debug)]
pub struct ReasonStep {
    /// `chain_of_thought: enabled` and `strategy: <name>` both land here.
    pub strategy: String,
    /// The pre-v2.83.0 positional form `reason <target>`. Empty for the
    /// block form, which names its evidence in `given` instead.
    pub target: String,
    /// `given:` — the evidence this deliberation reasons OVER. One reference,
    /// a comma list (`given: Initialize.output, sessions`) or a bracketed list
    /// (`given: [baseline.topology, current.topology]`); all three forms occur
    /// in the published README. Resolved against the flow bindings at dispatch.
    pub given: String,
    /// `ask:` — the question. This is the deliberation's actual prompt; before
    /// v2.83.0 it reached the model in exactly zero published programs.
    pub ask: String,
    /// `depth:` — the declared deliberation depth. Consumed by the dispatch
    /// FRAMING (like `strategy`, the other declared-posture field), not by a
    /// runtime iteration bound. Stated plainly so the field is not read as a
    /// loop count it has never been.
    pub depth: Option<u32>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ValidateStep {
    pub target: String,
    pub rule: String,
    /// v2.88.0 — `if confidence < 0.8 -> refine(max_attempts: 2)`, ATTACHED
    /// to the validation it governs.
    ///
    /// The guard is a field of the `validate` rather than a sibling statement,
    /// and the difference is what makes `confidence` unambiguous BY
    /// CONSTRUCTION. As a sibling, "which confidence does this guard read?"
    /// needs a resolution rule (nearest preceding validate), a compile error
    /// for the zero case, and dispatch-side re-pairing — three places to
    /// drift. As a field there is exactly one validation it can mean, the
    /// pairing survives into the IR untouched, and a guard with no validation
    /// is UNREPRESENTABLE rather than refused.
    pub guard: Option<ConfidenceGuard>,
    pub loc: Loc,
}

/// v2.88.0 — the self-correction guard three README blocks publish:
///
/// ```text
/// validate Assess.output against: ContractSchema
/// if confidence < 0.8 -> refine(max_attempts: 2)
/// ```
///
/// NOT control flow. It has no `else`, no braced body, no nesting; the metric,
/// the comparison and the action are each a CLOSED catalog of one. What it
/// declares is a floor and a bounded recovery: *if the validation's CSR is
/// below `threshold`, refine the validated value — at most `max_attempts`
/// times — re-scoring each attempt.* Landing it as a guard keeps "no
/// imperative branching inside a step body" true by construction while the
/// published surface compiles verbatim.
#[derive(Debug)]
pub struct ConfidenceGuard {
    /// The floor. The type-checker requires `0 < threshold ≤ 1`: the CSR lives
    /// in `[0, 1]`, so a floor of 0 can never fire (dead governance that reads
    /// as live) and a floor above 1 always fires (a retry loop disguised as a
    /// conditional). Both are refused, not warned.
    pub threshold: f64,
    /// Bound on recovery attempts. Required by the grammar itself — the
    /// published form always carries it — and the type-checker refuses 0 (a
    /// guard that promises recovery and performs none). Termination is by
    /// construction: attempts strictly increase toward this bound.
    pub max_attempts: u32,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct RefineStep {
    pub target: String,
    pub strategy: String,
    pub loc: Loc,
}
/// v2.83.0 — `weave [a, b] format: T include: [x, y]`, the synthesis
/// statement the README closes fourteen of its examples with.
///
/// **What was wrong.** The parser accepted only the BRACED field form
/// (`weave { sources: [...] format: T }`), which the README never writes. The
/// published bracket form fell into `skip_flow_step_structural` — and that
/// skipper stops at the first `output` KEYWORD it meets, so
/// `weave [A.output, B.output]` left the parser mid-list and the step then
/// failed with `Expected Colon` pointing at the comma. A silent drop that also
/// mislocated its own error.
#[derive(Debug)]
pub struct WeaveStep {
    pub sources: Vec<String>,
    pub target: String,
    pub format_type: String,
    pub priority: Vec<String>,
    pub style: String,
    /// v2.83.0 — `include: [summary, risks, recommendations]`: the parts
    /// the synthesis must contain. Published in twelve of the fourteen README
    /// weaves and, until this cycle, had no slot at any position. Consumed by
    /// the dispatch framing, like `priority` and `style`.
    pub include: Vec<String>,
    pub loc: Loc,
}
/// v2.8.0 — the closed catalog of `use <Tool>` argument forms. The
/// invocation surfaces are mutually exclusive, so a sum type models them
/// exactly (no ambiguous dual-empty state). NOTE: `apply: Tool given: <struct>`
/// (the splat form) is NOT here — it rides `StepNode.apply_ref` and is
/// validated against the tool schema in v2.8.0, not parsed as a `use`.
#[derive(Debug, Clone, PartialEq)]
pub enum UseArgs {
    /// `use Tool on "${arg}"` / `use Tool on query` — the v2.7.0 single
    /// positional argument. D5 back-compat: behaves byte-identically to the
    /// pre-58 `argument: String` (empty string when no `on` clause).
    LegacyPositional(String),
    /// `use Tool(query = "${q}", max_results = 5)` — D2 canonical multi-field
    /// keyword args. Each entry is `(name, value, value_kind)`: `value` is the
    /// expression STRING (the frontend has no structured `Expr`; mirrors
    /// `argument` / `parse_argument_list`); `value_kind` is `"literal"` or
    /// `"reference"` — the v2.10.0 classification from `parse_let_atom`, so the
    /// runtime resolves a bare identifier / `Step.output` as a binding lookup
    /// (like `let`) instead of passing the name literally. The type-checker
    /// (v2.8.0 + v2.10.0) validates each entry against the tool's declared input
    /// schema (W2 / CT-2 caller blame) and references against their source.
    Named(Vec<(String, String, String)>),
}

impl UseArgs {
    /// v2.8.0 transitional — the legacy single-arg string for the IR `argument`
    /// field (still `String` until v2.8.0 carries structured named args).
    /// `Named` projects an empty argument here; the type-checker validates
    /// named args from the AST, and v2.8.0 wire their structured dispatch.
    pub fn legacy_argument(&self) -> String {
        match self {
            UseArgs::LegacyPositional(s) => s.clone(),
            UseArgs::Named(_) => String::new(),
        }
    }
}

#[derive(Debug)]
pub struct UseToolStep {
    pub tool_name: String,
    pub args: UseArgs,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct RememberStep {
    pub expression: String,
    pub memory_target: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct RecallStep {
    pub query: String,
    pub memory_source: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ParBlock {
    /// v2.15.0 — the concurrent branches. Each top-level statement inside
    /// `par { … }` is one branch (a single-statement body); they execute
    /// concurrently at runtime. Empty for a `par {}` with no statements
    /// (degenerate no-op). Before v2.15.0 this was payload-free (the branches were
    /// skipped at parse time), so `par` ran as a stub.
    pub branches: Vec<Vec<FlowStep>>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct HibernateStep {
    pub event_name: String,
    pub timeout: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct DeliberateBlock {
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ConsensusBlock {
    pub loc: Loc,
}
/// v2.41.0 — `forge <Name>(seed: <string>) -> <Type> { mode:, novelty:,
/// depth:, branches:, constraints: }` — Directed Creative Synthesis. A
/// flow-body block that runs the Poincaré-Hadamard four-phase creative process
/// (Preparation → Incubation → Illumination → Verification) under a **measured,
/// fail-closed novelty guarantee**: the returned typed value must
/// clear a Normalized-Compression-Distance novelty floor against the obvious
/// baseline AND its `constraints:` anchor, or the forge fails structurally.
///
/// Before v2.41.0 this was a no-op stub (`{ loc }` only, body discarded). v2.41.0 makes
/// the README's long-standing claim true.
#[derive(Debug, Default)]
pub struct ForgeBlock {
    /// The synthesis name (`forge Artwork(...)` → `"Artwork"`).
    pub name: String,
    /// The creative seed — the conceptual starting point (`seed: "..."`).
    pub seed: String,
    /// The declared output type (`-> Visual` → `"Visual"`).
    pub output_type: String,
    /// Boden creativity mode (closed catalog: `combinatorial | exploratory |
    /// transformational`, `axon-T868`). Empty ⇒ defaults to `exploratory`.
    pub mode: String,
    /// Novelty target `[0.0, 1.0]` (`axon-T869`) — sets the fail-closed novelty
    /// floor and blends the incubation temperature. Default 0.5.
    pub novelty: f64,
    /// Incubation iterations (`depth ≥ 1`, `axon-T870`). Default 1.
    pub depth: i64,
    /// Illumination parallel branches (best-of-N, `branches ≥ 1`, `axon-T870`).
    /// Default 1.
    pub branches: i64,
    /// Optional `constraints:` reference to a declared `anchor` (`axon-T871`) —
    /// the verification predicate + coherence floor. Empty ⇒ novelty-floor-only
    /// verification.
    pub constraints_ref: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct FocusStep {
    /// v2.63.0 — the declared dataspace this σ∘π reads (the field
    /// keeps its historical name; T930 requires it to resolve to a
    /// `dataspace` symbol).
    pub expression: String,
    /// v2.63.0 — the data-plane `where:` clause (the v1.30.0 closed
    /// filter grammar, shared with retrieve/navigate — the design decision). Empty
    /// ⇒ no filter. Validated fail-closed at dispatch, like retrieve.
    pub where_expr: String,
    /// v2.63.0 — π: the projected columns (empty ⇒ all).
    pub select: Vec<String>,
    /// v2.63.0 — the binding name for the result (`as:`). Empty ⇒
    /// the dataspace name.
    pub output: String,
    pub loc: Loc,
}
/// v2.65.0 — `grad <letName> wrt <x> [as <name>]`: differentiate the
/// EXPRESSION a prior rich `let` bound (its AST rides the IR), at compile
/// time, symbolically. The derivative is checked (T931/T932), simplified,
/// and stored in the IR — a proof-carrying artifact, re-derived at deploy.
#[derive(Debug)]
pub struct GradStep {
    /// The prior rich `let` whose expression is differentiated.
    pub target: String,
    /// The variables to differentiate against (`wrt x` / `wrt [x, y]`).
    pub wrt: Vec<String>,
    /// Result binding (`as:`). Empty ⇒ `d_<target>`.
    pub output: String,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct AssociateStep {
    pub left: String,
    pub right: String,
    pub using_field: String,
    /// v2.63.0 — result binding name (`as:`). Empty ⇒ `<L>_<R>`.
    pub output: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct AggregateStep {
    pub target: String,
    pub group_by: Vec<String>,
    pub alias: String,
    /// v2.63.0 — the closed aggregate catalog entries
    /// (`count` | `count(col)` | `sum(col)` | `avg(col)` | `min(col)` |
    /// `max(col)`), kept RAW here; T930 validates shape + columns.
    pub compute: Vec<String>,
    /// v2.63.0 — data-plane `where:`. Empty ⇒ no filter.
    pub where_expr: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ExploreStepNode {
    pub target: String,
    pub limit: Option<i64>,
    /// v2.63.0 — result binding name (`as:`). Empty ⇒ the target.
    pub output: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct IngestStep {
    pub source: String,
    pub target: String,
    /// v2.63.0 — the declared wire format of the source bytes
    /// (closed catalog: `csv` | `json`). Kept RAW at parse; the v2.63.0
    /// type-checker requires it and validates it (`axon-T929`) — an
    /// ingest that does not declare what it is parsing is refused.
    pub format: String,
    /// v2.63.0 — bounds enforced on the RAW byte stream BEFORE any
    /// parsing (the v2.54.0 discipline). `None` ⇒ the engine's conservative
    /// defaults apply (bounded by default, never unbounded).
    pub max_bytes: Option<u64>,
    pub max_rows: Option<u64>,
    pub loc: Loc,
}
/// v4.5.0 — `declassify <Class> from <source> -> <Type> via <Shield>`.
///
/// Retiring a class is an ACT, not an inference. The compiler does not decide
/// that a value stopped being PHI; someone declares it, and the compiler
/// refuses the declaration when it is structurally impossible — when the
/// destination type still carries the class being retired.
///
/// The class is NAMED at the site rather than left to the shield, so a reader
/// of the flow sees what was retired without going to look it up.
#[derive(Debug, Default)]
pub struct DeclassifyStep {
    /// The regulatory class being retired. One per statement: retiring two
    /// classes is two acts, and collapsing them would hide which control
    /// justified which.
    pub class: String,
    /// The value entering the operation.
    pub source: String,
    /// The DECLARED TYPE the value leaves as. It must be a different type,
    /// because the type is the only thing a boundary reads.
    pub output_type: String,
    /// The shield that authorises this. It must declare the class in its own
    /// `declassifies:` — retiring a class is a capability, not a side effect
    /// of scanning.
    pub shield: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ShieldApplyStep {
    pub shield_name: String,
    pub target: String,
    pub output_type: String,
    pub loc: Loc,
}
/// v1.29.0 / v2.67.0 / **v2.83.0** — `stream<T> { on_chunk … on_complete … }`.
///
/// The body used to NOT EXIST. `parse_block_step` — shared with `deliberate`,
/// `consensus` and (pre-retraction) `transact` — called `skip_braced_block()`
/// and threw the block's contents away at PARSE time. The handler was not a
/// no-op because someone forgot to implement it; it was a no-op because the
/// body never reached the AST for anything to execute. Four advertised
/// primitives died in that one function.
///
/// **v2.83.0 — and v2.67.0 closed that with the WRONG SHAPE.** It gave the block a
/// `body: Vec<FlowStep>`, which no published block and no paper writes. The
/// specified surface — `the design plan` section 3.7, whose D8
/// promises *"backward compat for `stream<τ>` 100%, cero cambios en `.axon`
/// source files de adopters"* — is `stream<T> { on_chunk: B₁ on_complete: B₂ }`,
/// and README block 15 publishes exactly that. Measured before this landed:
///
///   * at FLOW level the published body was a hard parse error
///     (`Unexpected token in flow body: 'on_chunk'`);
///   * in a STEP body the whole block was silently discarded by
///     `skip_flow_step_structural`, so block 15's `step Stream` reached the
///     dispatcher with `pix_ops=0`, `ask=""`, `output=""` — an EMPTY step, whose
///     `Stream.output` the next step then reasoned over.
///
/// So v2.67.0's attestation was the v2.83.0 `reason` defect one more time: a real
/// engine behind a grammar no adopter could write. `body` is KEPT (it parses, it
/// lowers, it runs, and removing it would break any program written against
/// v2.67.0), but it is no longer the primitive's published face.
#[derive(Debug)]
pub struct StreamBlock {
    /// The `<T>` in `stream<T>` — the CHUNK type. Empty when the block is
    /// written without one.
    ///
    /// It used to be discarded silently: `parse_stream_block`'s "tolerate the
    /// pre-111 form" loop advanced to the first `{`, eating `<QuoteData>` on the
    /// way. A type parameter consumed by nothing is the v2.67.0 defect, so it is
    /// captured here and type-checked at the handler boundary.
    pub chunk_type: String,
    /// `on_chunk: { … }` — run ONCE PER CHUNK, with the chunk bound under
    /// `chunk`. `None` when the handler is absent.
    ///
    /// It is a [`StepNode`], not a `Vec<FlowStep>`, because the published arm
    /// body is a STEP body and not a flow body: block 15 writes
    /// `on_chunk: { probe chunk for […] output: QuoteSnapshot }`, and `output:`
    /// is a step field that has no flow-level position at all. Sharing the shape
    /// means the arm reuses `run_step` — the design decision's "one concept, two positions",
    /// so there is no second dispatch implementation to drift.
    pub on_chunk: Option<StepNode>,
    /// `on_complete: { … }` — run ONCE, after the source closes, with the
    /// accumulated stream bound under `complete`. `None` when absent.
    pub on_complete: Option<StepNode>,
    /// v2.83.0 — `on_error: { … }` — run when the SOURCE fails, with the
    /// failure bound under `error`.
    ///
    /// It handles a failure of the **producer**, never a failure of the author's
    /// own handlers. If `on_chunk` panics its way to a dispatch error, that is a
    /// bug in the program, and routing it here would let a broken handler
    /// silently catch itself and report the stream as healthy. Cancellation is
    /// not a failure either — a cancelled stream propagates as cancelled.
    ///
    /// When present and the source fails, the step COMPLETES with this arm's
    /// output: the author declared what to do, so the recovery is explicit
    /// rather than a swallowed error. When absent, the failure propagates.
    pub on_error: Option<StepNode>,
    /// v2.67.0's body form: `stream { <steps> }`. Executed in order; each
    /// one's fragments are emitted on the flow's event channel as produced.
    /// Retained for compatibility — see the type-level note above.
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}
// ── v2.87.0 — algebraic effects (Plotkin/Pretnar) ─────────────────────────
//
// The four constructs `the design plan` section 3.6/section 3.7 fixes: a top-level `effect`
// declaration, `perform` in a step or flow body, `handle … in …` in a flow
// body, and `resume()` / `abort()` / `forward` inside a handler clause.
//
// ⚠️ These are NOT the `Instruction` types in `axon-rs/src/effects/ir.rs`.
// That module is a self-contained FSM over a JSON instruction alphabet whose
// catch-all variant (`Instruction::Passthrough`, `#[serde(other)]`) is INERT —
// lowering a handler body onto it would make every non-effect node in the body
// a no-op, which is precisely the v2.67.0 defect this cycle exists not to repeat.
// the design decision: the effect machine is the DISPATCHER, and the instruction alphabet is
// `IRFlowNode`, so a handler clause can `emit`, `use` a tool or `persist` like
// any other body. See `the design plan`.

/// `effect SSE { Emit(token: Token) -> Unit  Done() -> Never }` — a top-level
/// declaration, a peer of `tool` / `persona` / `anchor` per `the design plan` section 3.1.
///
/// The declaration is what makes the operation catalog CLOSED. the design decision resolves
/// a bare `perform Emit(x)` against exactly this set: one declarer ⇒ resolved,
/// two ⇒ a compile error naming both, zero ⇒ a compile error. Without the
/// declaration there is no catalog and `effect_name` would have to be guessed.
#[derive(Debug)]
pub struct EffectDefinition {
    pub name: String,
    pub operations: Vec<EffectOperation>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// One operation inside an `effect` declaration: `Emit(token: Token) -> Unit`.
#[derive(Debug)]
pub struct EffectOperation {
    pub name: String,
    pub parameters: Vec<Parameter>,
    /// The declared return type. `Never` is the bottom sentinel `the design plan` section 3.1
    /// writes on `Done() -> Never` — an operation whose handler is not expected
    /// to `resume`. Empty when the source omits `-> T`.
    pub return_type: String,
    pub loc: Loc,
}

/// `handle SSE { Emit(token) -> { … } } in { … }` — the delimited handler
/// scope (D3: an effect is interceptable only inside `body`).
#[derive(Debug)]
pub struct HandleBlock {
    /// `handle E1, E2 { … }` — the effects this frame intercepts. More than one
    /// is legal; `IRHandlerFrame.effect_names` in the cycle-23 IR is a `Vec` for
    /// the same reason.
    pub effect_names: Vec<String>,
    pub clauses: Vec<HandlerClause>,
    /// The `in { … }` block. Ordinary flow steps — this is what the design decision buys.
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}

/// One clause of a [`HandleBlock`]: `Emit(token) -> { … }`.
#[derive(Debug)]
pub struct HandlerClause {
    pub operation_name: String,
    /// The clause's binders. `perform Emit(x)`'s argument is bound under the
    /// clause's parameter name for the duration of the clause body — the same
    /// discipline `EffectRuntime::dispatch_clause_for` uses (save, bind,
    /// restore), so a clause cannot leak a binding into its continuation.
    pub parameter_names: Vec<String>,
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}

/// `perform Emit(x)` (bare) or `perform SSE.Emit(x)` (qualified).
///
/// the design decision accepts both. `effect_name` is `None` for the bare form as written;
/// the IR generator resolves it against the declared catalog and the
/// type-checker refuses an ambiguous or unknown operation with the offending
/// location. The bare form is what `the design plan` section 3.1 publishes, and under v2.83.0's
/// doctrine the published surface is the promise.
#[derive(Debug)]
pub struct PerformStep {
    pub effect_name: Option<String>,
    pub operation_name: String,
    /// Argument expressions, verbatim source text. The cycle-23 IR carries
    /// `arguments: Vec<String>` for the same reason: resolution against the
    /// live bindings is a RUNTIME act, and pre-resolving here would freeze a
    /// value the enclosing step has not produced yet.
    pub arguments: Vec<String>,
    pub loc: Loc,
}

/// `resume()` / `resume(value)` — invoke the captured one-shot continuation.
/// Legal only inside a handler clause body (D2, and the parser enforces it).
#[derive(Debug)]
pub struct ResumeStep {
    /// The resumed value, verbatim. Empty ⇒ `resume()` ⇒ Unit.
    pub value_expr: String,
    pub loc: Loc,
}

/// `abort()` / `abort(value)` — terminate the enclosing `handle` without
/// resuming. The continuation is dropped, never invoked.
#[derive(Debug)]
pub struct AbortStep {
    pub value_expr: String,
    pub loc: Loc,
}

/// `forward Emit(t)` / `forward SSE.Emit(t)` (D12) — propagate the operation to
/// the next OUTER frame, bypassing this one. What makes a handler a decorator
/// rather than a terminator.
#[derive(Debug)]
pub struct ForwardStep {
    pub effect_name: Option<String>,
    pub operation_name: String,
    pub arguments: Vec<String>,
    pub loc: Loc,
}

#[derive(Debug)]
pub struct NavigateStep {
    /// v2.83.0 — per-navigation `depth:` override (README's pix family
    /// writes it inline). `None` ⇒ the navigator's bounded-rationality
    /// default. Threaded into `NavConfig.d_max` at dispatch, so this field
    /// DECIDES something — adding one consumed by nothing would be the v2.67.0
    /// defect this cycle exists to end.
    pub depth: Option<i64>,
    pub pix_name: String,
    pub corpus_name: String,
    pub query_expr: String,
    pub trail_enabled: bool,
    pub output_name: String,
    /// v2.13.0 — for MDN corpus-graph navigation: the seed document `from:`
    /// to start the ε-informative traversal. Empty for PIX tree navigation.
    pub seed: String,
    /// v2.13.0 — for MDN: the `budget:` (max documents). `None` = default.
    pub budget: Option<i64>,
    /// v2.17.0 (Q2) — optional column-scope filter (`where:`) for a
    /// `corpus from axonstore`. A raw filter expr (same shape as `retrieve …
    /// where`) pushed to the SELECT sourcing the corpus rows, so an adopter
    /// multiplexing sub-tenants in one axon-tenant via a column can scope the
    /// MDN graph to a single sub-tenant. Empty = no column filter (RLS-only).
    pub where_expr: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct DrillStep {
    pub pix_name: String,
    pub subtree_path: String,
    pub query_expr: String,
    pub output_name: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct TrailStep {
    pub navigate_ref: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct CorroborateStep {
    pub navigate_ref: String,
    pub output_name: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct OtsApplyStep {
    pub ots_name: String,
    pub target: String,
    pub output_type: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct MandateApplyStep {
    pub mandate_name: String,
    pub target: String,
    pub output_type: String,
    pub loc: Loc,
}
/// v2.83.0 — `<Agent>(arg, …)` written as a step-body statement: the
/// form the README uses in every one of its agent examples, and the last piece
/// that makes v2.83.0's executor reachable from source.
///
/// It is a distinct node rather than a reuse of [`ComputeApplyStep`] because
/// the two are opposites: a `compute` is a PURE function with no model in the
/// loop and no budget, and an agent is a bounded deliberation that spends. A
/// shared node would invite a shared handler, and the first person to add a
/// field would have to decide which of the two it meant.
#[derive(Debug)]
pub struct AgentCallStep {
    /// The declared `agent` being invoked. A NAME — never dotted.
    pub agent_name: String,
    /// Positional arguments, each a v2.83.0 SUBJECT (a dotted reference or a
    /// literal). README writes `TrendAnalyzer(Gather.output)`.
    pub arguments: Vec<String>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct ComputeApplyStep {
    pub compute_name: String,
    pub arguments: Vec<String>,
    pub output_name: String,
    pub loc: Loc,
}
/// v1.6.0 D4 — dual-mode listen.
///
/// `channel_is_ref = true` ⇒ `channel` is the name of a declared
/// `ChannelDefinition` (canonical v1.6.0 form). `false` ⇒ legacy
/// string topic (deprecated; type checker emits a warning).
#[derive(Debug)]
pub struct ListenStep {
    pub channel: String,
    pub channel_is_ref: bool,
    pub event_alias: String,
    /// v2.4.0 — the handler body: real flow-steps executed on each event /
    /// scheduled tick. Pre-v2.4.0 the `{ … }` block was `skip_braced_block`'d
    /// (the listener was inert); now it is parsed so a `daemon` can run logic
    /// (e.g. `run <Flow>(…)`) per trigger. Empty for a bodyless `listen`.
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct DaemonStepNode {
    pub daemon_ref: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct PersistStep {
    pub store_name: String,
    /// v1.30.0 — the `{ col: value }` field block. Empty when the
    /// step is written without a block (`persist <store>`), in which
    /// case the runtime falls back to writing the flow's user
    /// bindings as a row (backward-compatible with v1.30.0).
    pub fields: Vec<(String, String)>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct RetrieveStep {
    pub store_name: String,
    pub where_expr: String,
    pub alias: String,
    /// v2.21.0 — optional `order_by:` clause: a closed
    /// comma-separated list of `column [asc|desc]` (same identifier
    /// discipline as `where:` columns — no injection). Empty = no
    /// ordering. Raw string, parsed + validated by the runtime
    /// (`filter::render_bounds`) and at `axon check` (v1.31.0 `axon-T807`).
    pub order_by: String,
    /// v2.21.0 — optional `limit:` clause: a `u32` literal OR a
    /// `${binding}` resolved to a `u32` at runtime. Empty = no limit.
    /// Raw string (`"100"` or `"${max}"`), validated at `axon check`
    /// (v1.31.0 `axon-T808`).
    pub limit_expr: String,
    /// v2.33.0 — optional `aggregate:` clause: a member of the CLOSED
    /// catalog `count` | `sum(<col>)` | `avg(<col>)` | `min(<col>)` |
    /// `max(<col>)`. Empty = a plain `SELECT *` retrieve. Raw string,
    /// parsed + validated by the runtime (`filter::parse_aggregate_clause`)
    /// and at `axon check` (v2.33.0 `axon-T843`/`T844`/`T845`).
    pub aggregate: String,
    /// v2.33.0 — optional `group_by:` clause: a comma-separated list
    /// of column identifiers (same discipline as `order_by:` columns).
    /// Requires an `aggregate:`. Empty = no grouping.
    pub group_by: String,
    /// v2.40.0 — optional `cache:` reference. A `retrieve` reads a store
    /// (a `storage` effect — never `pure`), so caching it is always a WIDENING
    /// that accepts staleness: the named `cache` MUST carry a finite `ttl:`
    /// (`axon-T865`) and typically an `invalidate_on:`. Names a declared
    /// `cache` (`axon-T864`); empty = uncached. Never governed by a
    /// `default: true` policy (defaults only auto-cover provably-`pure` tools).
    pub cache: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct MutateStep {
    pub store_name: String,
    pub where_expr: String,
    /// v1.30.0 — the `{ col: value }` SET assignments. Empty when
    /// the step declares no columns, in which case the runtime falls
    /// back to writing the flow's user bindings as the `SET` clause
    /// (backward-compatible with v1.31.0).
    pub fields: Vec<(String, String)>,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct PurgeStep {
    pub store_name: String,
    pub where_expr: String,
    pub loc: Loc,
}
#[derive(Debug)]
pub struct TransactBlock {
    pub loc: Loc,
}

/// v2.43.0 — `scope <Name> { targets:, depth:, approver: }` — the
/// authorization scope a `warden` block runs `within`. The load-bearing safety
/// construct (paper section 5.2): it declares which resources may be analysed
/// (`targets` allowlist), how invasively (`depth` ceiling), and who authorised
/// it (`approver` capability). A `warden` with no resolvable in-scope
/// authorization does not compile (fail-closed). Named + referenced, like
/// `cache`/`cors`. **Unknown fields are a hard parse error**: a scope
/// governs an offensive-capable analysis, so a typo can never silently widen it.
#[derive(Debug, Default)]
pub struct ScopeDefinition {
    pub name: String,
    /// `targets: [ "<resource>", … ]` — the allowlist of resources the operator
    /// owns/controls and authorises for analysis. Required + non-empty (v2.43.0
    /// `axon-T88x`); a target outside this list is a typed rejection.
    pub targets: Vec<String>,
    /// `depth: static_artifact | memory_dump | live_network` — the MOST invasive
    /// analysis depth this scope permits (the ceiling). Closed catalog, ordered
    /// least→most invasive; empty ⇒ the safest default `static_artifact` (v2.43.0).
    pub depth: String,
    /// `approver: [requires] "<capability>"` — the capability whose holder
    /// authorised this scope (segregation of duties, the `mandate` v1.13.1 model).
    /// Required (v2.43.0).
    pub approver: String,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.43.0 — the `warden(<target>) within <Scope> { … }` adversarial
/// security-analysis block. A flow-body block (like `quant`): it audits a
/// `target` under a paraconsistent adversarial framing, emitting attested
/// `Vulnerability` findings — but ONLY `within` a signed authorization `scope`.
/// v2.43.0 ships the SURFACE only; scope resolution + the depth/witness discipline
/// is v2.43.0, and the real analysis engine is v2.43.0 (enterprise).
#[derive(Debug, Default)]
pub struct WardenBlock {
    /// `warden(<target>)` — a reference to the resource under analysis (a
    /// let-bound value / declared target). v2.43.0 checks it is within the scope's
    /// `targets` allowlist.
    pub target: String,
    /// `within <Scope>` — the MANDATORY authorization scope reference. Empty is a
    /// hard error (v2.43.0 `axon-T88x`, fail-closed): no scope ⇒ no analysis.
    pub scope_ref: String,
    /// The nested flow-body statements (`find_exploits()`, `fortify`, `emit`),
    /// parsed like `par`/`quant` branches so v2.43.0 can walk them.
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}

/// v2.4.0 — the `quant` cognitive primitive block surface
/// (`papers/paper_primitiva_quant.md`; enterprise v2.4.0).
///
/// `quant` projects an MEK semantic tensor into a complex Hilbert space,
/// evolves it under a variational / kernel-feature map, and collapses back to
/// classical silicon. The attribute header is OPTIONAL — the bare `quant { … }`
/// form (the paper's example) leaves every attribute defaulted. The richer form
/// `quant(encoding: amplitude, observable: M, qubits: 10, depth: 4,
/// bandwidth: 0.5, backend: quant_sim) { … }` pins the encoding scheme (D2),
/// the Pauli-sum observable (D5), the register width / circuit depth, the
/// projected-kernel bandwidth γ (D7), and the algebraic-effect backend (D1/D9).
///
/// v2.4.0 ships the SURFACE only. The Continuous Type Invariant over `body`
/// (v2.4.0), the typed continuous grammar incl. typed `let` + `Observable`
/// (v2.4.0), and the `quant_sim`/`qpu_native` effect injection + `yield`
/// measurement point (v2.4.0) land in subsequent steps.
#[derive(Debug, Default)]
pub struct QuantBlock {
    /// `encoding:` — `amplitude` (default) or `angle` (shallow). `None` = the
    /// compiler default (amplitude). Carried as the surface spelling; v2.4.0
    /// validates against the closed scheme set.
    pub encoding: Option<String>,
    /// `observable:` — the name of a declared `Observable` (Pauli-sum, D5).
    /// `None` if unspecified (v2.4.0 resolves + Hermiticity-checks it).
    pub observable: Option<String>,
    /// `qubits:` — the register width n (D = 2ⁿ). `None` = inferred from the
    /// encoded tensor dimensionality. The OSS reference backend caps n ≤ 10
    /// (D1); that bound is enforced at v2.4.0, not here.
    pub qubits: Option<i64>,
    /// `depth:` — the variational circuit depth L. `None` = backend default.
    pub depth: Option<i64>,
    /// `bandwidth:` — the projected-quantum-kernel bandwidth γ (D7). `None` =
    /// backend default.
    pub bandwidth: Option<f64>,
    /// v2.23.0 — `reupload:` L, the number of DATA RE-UPLOADING layers. `None`
    /// or `1` = no re-uploading (the data enters once → a quadratic form, provably
    /// classical for amplitude+Pauli, v2.23.0). `L ≥ 2` interleaves the data
    /// encoding with entangling layers L times — the ONLY provable escape from the
    /// quadratic bound (Havlíček-style; canonical with `encoding: angle`). The
    /// resulting kernel must still pass an Advantage Witness to be deployed
    /// claiming advantage (v2.23.0).
    pub reupload: Option<i64>,
    /// The algebraic-effect backend tag: `quant_sim` (default) or `qpu_native`
    /// (D1/D9). Stored as the bare backend name; v2.4.0 injects the full
    /// `ots:backend:<tag>` effect into the enclosing flow's effect row.
    pub effect: String,
    /// The nested flow-body statements (parsed like `par` branches, so v2.4.0
    /// can apply the Continuous Type Invariant to real AST). Empty for an
    /// empty `quant {}`.
    pub body: Vec<FlowStep>,
    pub loc: Loc,
}

/// v2.4.0 — one term `cₖ · Pₖ` of a Pauli-sum observable.
///
/// `coefficient` is a real scalar (parsed as `f64`); `pauli` is a Pauli string
/// over the closed alphabet `{I, X, Y, Z}` (one char per qubit), e.g. `"ZZ"` or
/// `"XI"`. A real linear combination of Pauli strings is **Hermitian by
/// construction** (each Pauli string is Hermitian; real-weighted sums preserve
/// Hermiticity), which is why the observable needs no separate Hermiticity check.
#[derive(Debug, Default, Clone)]
pub struct PauliTerm {
    pub coefficient: f64,
    pub pauli: String,
    pub loc: Loc,
}

/// v2.4.0 — the `observable <Name> { qubits, term: cₖ·Pₖ … }` declaration
/// (paper section 3.2; plan D5). A typed Pauli-sum `M = Σ cₖ Pₖ` that a `quant` block
/// measures the evolved state against. The type-checker validates the closed
/// `{I,X,Y,Z}` alphabet + equal term lengths + non-empty sum; Hermiticity is
/// guaranteed by construction (real coefficients).
#[derive(Debug, Default)]
pub struct ObservableDefinition {
    pub name: String,
    /// `qubits: n` — the register width every Pauli string must span. `None`
    /// = inferred from the (equal) term lengths.
    pub qubits: Option<i64>,
    pub terms: Vec<PauliTerm>,
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// v2.23.0 — `witness <Name> { claim: <ref> against: <baseline>
/// metric: <metric>  threshold: <ε>  data: <source> }`. The Advantage-Witness
/// proof obligation. The compiler proves it WELL-FORMED (v2.23.0, `axon-E0790`);
/// the advantage VALUE is computed on real `data` at deploy/runtime and carried
/// as a verdict (v2.23.0+). Fields are order-free `key: value` pairs.
#[derive(Debug)]
pub struct WitnessDefinition {
    pub name: String,
    /// The primitive instance whose advantage is claimed (e.g. an `observable` /
    /// `corpus` name, or a quant kernel reference).
    pub claim: String,
    /// The cheaper alternative the claim must beat (a closed-catalog baseline
    /// like `cosine` / `flat_retrieval` / `single_shot`, or a reference).
    pub baseline: String,
    /// How advantage is measured — a closed-catalog metric (`geometric_difference`,
    /// `kernel_target_alignment`, `ranking_lift`, `outcome_lift`).
    pub metric: String,
    /// The minimum advantage that justifies the cost (ε ≥ 0).
    pub threshold: f64,
    /// The real-data source the witness is evaluated on (a ref to an axonstore /
    /// corpus / labelled set). Required — advantage cannot be claimed in the abstract.
    pub data: String,
    pub loc: Loc,
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

// ── v1.6.0 — Mobile Typed Channels ──────────────────────────────────

/// `channel Name { message: T, qos: X, lifetime: ℓ, persistence: π, shield: σ }`.
///
/// First-class affine resource carrying a typed message.  Direct port
/// of `axon.compiler.ast_nodes.ChannelDefinition`.  `message` retains
/// the surface spelling (e.g. `"Order"` or `"Channel<Order>"`) so the
/// type checker can resolve nested mobility (paper section 3.3).
#[derive(Debug)]
pub struct ChannelDefinition {
    pub name: String,
    pub message: String,     // type name OR "Channel<T>" for second-order
    pub qos: String,         // at_most_once | at_least_once | exactly_once | broadcast | queue
    pub lifetime: String,    // linear | affine | persistent (D1 default: affine)
    pub persistence: String, // ephemeral | persistent_axonstore
    pub shield_ref: String,  // optional σ-shield gate for publish (D8)
    pub loc: Loc,
    /// v1.5.2 — leading comment trivia attached to this declaration
    /// (comments preceding the declaration's first token, since the
    /// previous declaration or file start). Empty by default.
    pub leading_trivia: Vec<crate::tokens::Trivia>,
    /// v1.5.2 — trailing comment trivia (same line as the
    /// declaration's last effective token). Empty by default.
    pub trailing_trivia: Vec<crate::tokens::Trivia>,
}

/// `emit ChannelName(value_ref)` — π-calculus output prefix `c⟨v⟩.P`.
///
/// Direct port of `axon.compiler.ast_nodes.EmitStatement`.  Handles
/// both Chan-Output (scalar payload) and Chan-Mobility (channel-as-
/// value); the type checker dispatches based on whether `value_ref`
/// resolves to a `ChannelDefinition`.
#[derive(Debug)]
pub struct EmitStatement {
    pub channel_ref: String,
    pub value_ref: String,
    pub loc: Loc,
}

/// v2.46.0 — `mint <Credential> as <binding>`: the flow-step verb that
/// mints a declared ephemeral `credential` at runtime. The binding
/// receives the raw bearer string (shown once — the type checker forbids
/// it from flowing into a `persist` payload, `axon-T896`: credentials do
/// not enter stores). Undeclared credential reference = `axon-T895`.
#[derive(Debug)]
pub struct MintStep {
    pub credential_ref: String,
    pub binding: String,
    pub loc: Loc,
}

/// v2.48.0 — `rotate <SecretsStore> [where "<filter>"] with <Tool> as
/// <binding>`: the mediated secret-renewal flow verb (doctrine
/// `rotation_without_revelation`). Set-oriented like `mutate`: every
/// custody entry of the store's class matching the filter (whole class
/// when the filter is omitted — the post-breach bulk-rotation shape) is
/// renewed through ONE mediated exchange per key: the runtime reveals
/// the current value only into the tool call, the tool returns the new
/// value, the runtime commits it (CAS on version — concurrent rotators
/// cannot double-spend a refresh credential). The binding receives the
/// METADATA-ONLY summary `{attempted, rotated, failed}` — no term
/// evaluates to a secret value. `rotate` on a non-secrets store =
/// `axon-T898`; an undeclared tool = `axon-T899`.
#[derive(Debug)]
pub struct RotateStep {
    pub store_ref: String,
    /// The v2.21.0-grammar metadata filter (`expires_at < now() + interval
    /// '10 minutes'`, `key LIKE 'crm.%'`, …). Empty = the whole class.
    pub where_expr: String,
    pub tool_ref: String,
    pub binding: String,
    pub loc: Loc,
}

/// `publish ChannelName within ShieldName` — capability extrusion.
///
/// Paper section 4.3 (Publish-Ext) materialized as a flow step. The `within
/// <Shield>` clause is mandatory (D8) — the parser rejects bare
/// `publish C`, the type checker rejects publishes whose shield does
/// not cover κ(message_type) (v1.2.0 + paper section 3.4).
#[derive(Debug)]
pub struct PublishStatement {
    pub channel_ref: String,
    pub shield_ref: String,
    pub loc: Loc,
}

/// `discover ChannelName as alias` — dual of publish.
///
/// Imports a previously-published handle into a fresh affine local
/// binding.  The `as <alias>` is mandatory; the type checker rejects
/// discovery of channels that were never declared with `shield_ref`.
#[derive(Debug)]
pub struct DiscoverStatement {
    pub capability_ref: String,
    pub alias: String,
    pub loc: Loc,
}