verbs/

save.rs

// SPDX-License-Identifier: Apache-2.0
//! Shared save primitive for `capture` / internal checkpoint / ready auto-capture.
//!
//! Embedding surfaces call [`capture`] with typed input and receive a typed
//! [`CaptureReport`]. Repo keeps atomic tree/state mutation; this module owns
//! safety preflight, attribution/session resolution, Heddle snapshot, optional
//! Git-overlay write-through, and report assembly. [`execute_save`] remains the
//! lower-level primitive for compound verbs such as ready.

use std::time::Instant;

use anyhow::{Context, Result, anyhow};
use chrono::Utc;
use heddle_git_projection::{GitProjection, WriteThroughOutcome};
use objects::{
    HeddleError, RecoveryDetails,
    lock::RepositoryLockExt,
    object::{Agent, Attribution, ContentHash, Principal, State, StateId, ThreadName, Tree},
    store::ObjectStore,
    worktree::WorktreeStatus,
};
use oplog::{OpLogBackend, OpRecord};
use refs::Head;
use repo::{
    ActorPresenceStore, CommitGraphIndex, GitCheckpointRecord, Hook, HookContext, HookManager,
    OperationScope, Repository, RepositoryCapability, SessionManager, SnapshotProfile, Thread,
    ThreadFreshness, ThreadIntegrationPolicy, ThreadManager, ThreadMode, ThreadState,
    WorktreeStateLookupProfile, WorktreeStatusOptions, refresh_active_thread_metadata,
    update_thread_state_from_state,
};
use schemars::JsonSchema;
use serde::Serialize;
use sley::Repository as SleyRepository;

use crate::{
    ActionTemplate, ExecutionContext, HeddleReport, IdentityCursor, MachineContractInput,
    MachineOutputKind, OutputDiscriminator, ReportContract, RepositoryVerificationState,
    SegmentRotation, attach_published_segment_fields,
    build_repository_verification_health_with_worktree_status, build_repository_verification_state,
    build_repository_verification_state_with_machine_contract,
    build_repository_verification_state_with_worktree_status,
    build_repository_verification_state_with_worktree_status_and_machine_contract,
    cursor_segment_rotation, published_field, read_identity_cursor, schema_for_report,
    stamp_identity_cursor,
    status::next_action::{
        contextual_thread_action, heddle_action, import_guidance_includes_active_branch,
        remote_tracking_status,
    },
    verify::action_template,
};

const BULK_CAPTURE_WARNING_THRESHOLD: usize = 500;

/// Fully-resolved inputs for the normal local capture operation.
#[derive(Debug)]
pub struct CaptureOptions {
    pub intent: String,
    pub confidence: Option<f32>,
    pub force: bool,
    pub agent: CaptureAgentOptions,
    pub machine_contract_input: Option<MachineContractInput>,
}

/// Agent inputs supplied by an embedding surface.
///
/// Process environment parsing stays in the CLI adapter. Applying the identity
/// patch, resolving repository/session precedence, and rotating a session
/// segment are capture semantics and therefore live behind [`capture`].
#[derive(Debug, Clone, Default)]
pub struct CaptureAgentOptions {
    pub provider: Option<String>,
    pub model: Option<String>,
    pub session: Option<String>,
    pub segment: Option<String>,
    pub policy: Option<String>,
    pub environment_policy: Option<String>,
    pub default_policy: Option<String>,
    pub identity_patch: IdentityCursor,
    pub no_policy: bool,
    pub no_agent: bool,
}

/// Attribution resolved lazily after capture's non-mutating safety checks.
#[derive(Debug, Clone)]
struct CaptureAttribution {
    attribution: Attribution,
    principal_source: String,
    /// Native harness session from the workspace identity stamp. This remains
    /// distinct from Heddle `Session.id` and only advances the last-turn cursor.
    harness_session_id: Option<String>,
    warnings: Vec<String>,
}

/// Capture-specific timings owned by the operation implementation.
#[derive(Debug, Clone, Copy, Default)]
pub struct CaptureProfile {
    pub worktree_status_ms: u128,
    pub preflight_ms: u128,
    pub attribution_ms: u128,
    pub execute_save_ms: u128,
}

/// Final semantic report returned by the capture seam.
///
/// The CLI may project this into its stable JSON wire type or render it for a
/// person, but it must not add recovery state or derive workflow actions.
#[derive(Debug, Clone, Serialize, JsonSchema)]
pub struct CaptureReport {
    pub output_kind: &'static str,
    pub state_id: String,
    pub content_hash: String,
    /// Git commit written for this state in Git Overlay mode.
    pub git_checkpoint: Option<String>,
    pub intent: Option<String>,
    pub confidence: Option<f32>,
    pub task_assignment_id: Option<String>,
    pub principal: CapturePrincipalReport,
    pub principal_source: String,
    pub agent: Option<CaptureAgentReport>,
    pub promotion_suggested: bool,
    pub heavy_impact_paths: Vec<String>,
    pub captured_path_count: usize,
    pub warnings: Vec<String>,
    pub signed: bool,
    pub message: String,
    pub recommended_action: Option<String>,
    pub recommended_action_template: Option<ActionTemplate>,
    pub verification: RepositoryVerificationState,
    #[serde(skip)]
    #[schemars(skip)]
    pub captured_thread_targets_integration: bool,
    #[serde(skip)]
    #[schemars(skip)]
    pub diagnostics: CaptureDiagnostics,
}

impl CaptureReport {
    pub const CONTRACT: ReportContract = ReportContract {
        schema_name: "capture",
        machine_output_kind: MachineOutputKind::Json,
        output_discriminator: Some(OutputDiscriminator {
            field: "output_kind",
            value: "capture",
        }),
        schema: schema_for_report::<CaptureReport>,
    };
}

impl HeddleReport for CaptureReport {
    const CONTRACT: ReportContract = CaptureReport::CONTRACT;
}

#[derive(Debug, Clone, Serialize, JsonSchema, PartialEq, Eq)]
pub struct CapturePrincipalReport {
    pub name: String,
    pub email: String,
}

#[derive(Debug, Clone, Serialize, JsonSchema, PartialEq, Eq)]
pub struct CaptureAgentReport {
    pub provider: String,
    pub model: String,
    pub session_id: Option<String>,
    pub segment_id: Option<String>,
    pub policy_id: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub thought_level: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub parent: Option<String>,
}

#[derive(Debug, Clone)]
pub struct CaptureDiagnostics {
    pub profile: CaptureProfile,
    pub snapshot_profile: SnapshotProfile,
    pub state_create_ms: u128,
    pub captured_path_count_ms: u128,
    pub post_verification_ms: u128,
    pub thread_metadata_ms: u128,
    pub previous_state_ms: u128,
    pub previous_state_profile: WorktreeStateLookupProfile,
    pub signature_lookup_ms: u128,
}

/// How far a save should write through into Git (Git-overlay only).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum GitScope {
    /// Heddle state only — no Git checkpoint (native capture).
    None,
    /// Checkpoint the staged Git index boundary (caller supplies the tree).
    Staged,
    /// Capture/checkpoint the full worktree (or current clean state).
    WorktreeAll,
}

/// Public CLI / facade verb that requested the save.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum SaveVerb {
    Capture,
    Checkpoint,
}

/// Inputs for [`execute_save`]. Attribution is resolved by the caller so CLI
/// env/harness/agent precedence stays at the embedding surface.
#[derive(Debug)]
pub struct SavePlan {
    pub verb: SaveVerb,
    pub intent: Option<String>,
    pub confidence: Option<f32>,
    pub attribution: Attribution,
    pub git_scope: GitScope,
    /// When set, snapshot this tree instead of walking the worktree
    /// (staged-index commits).
    pub supplied_tree: Option<Tree>,
    /// Prefer the current HEAD state when present (checkpoint bootstrap path).
    pub reuse_current_state: bool,
    /// After ensuring state, refuse dirty Heddle worktree before Git write-through.
    pub require_clean_worktree: bool,
    /// Refuse a worktree snapshot whose tree is identical to the current state.
    /// The comparison happens during the snapshot tree build, avoiding a
    /// separate preflight walk.
    pub require_worktree_change: bool,
    pub worktree_status_options: WorktreeStatusOptions,
    /// Authoritative parent-relative paths found by capture preflight. The
    /// snapshot builder consumes these before the monitor cursor advances so
    /// it can rewrite only the affected leaf-to-root chain.
    pub known_worktree_changes: Option<WorktreeStatus>,
    /// Run pre/post snapshot hooks when creating a new Heddle state.
    pub run_hooks: bool,
    /// Fold snapshot + GitCheckpoint oplog batches into one undo unit.
    pub coalesce_snapshot_and_checkpoint: bool,
    /// Export an unmapped checkpoint state on top of the checkout's current
    /// Git tip. Used only by sequential multi-peer land.
    pub linearize_git_parent: bool,
    /// Optional precomputed git-overlay worktree status for verification reuse
    /// on the no-new-state path. Post-mutation paths always recompute.
    pub precomputed_worktree_status:
        Option<repo::Result<Option<objects::worktree::WorktreeStatus>>>,
    /// Optional embedding-surface machine-contract inventory. Passing it into
    /// core verification lets callers reuse the post-save proof instead of
    /// rebuilding the entire repository health envelope for presentation.
    pub machine_contract_input: Option<MachineContractInput>,
}

impl SavePlan {
    pub fn capture(intent: impl Into<String>, attribution: Attribution) -> Self {
        Self {
            verb: SaveVerb::Capture,
            intent: Some(intent.into()),
            confidence: None,
            attribution,
            git_scope: GitScope::None,
            supplied_tree: None,
            reuse_current_state: false,
            require_clean_worktree: false,
            require_worktree_change: false,
            worktree_status_options: WorktreeStatusOptions::default(),
            known_worktree_changes: None,
            run_hooks: true,
            coalesce_snapshot_and_checkpoint: false,
            linearize_git_parent: false,
            precomputed_worktree_status: None,
            machine_contract_input: None,
        }
    }

    pub fn checkpoint(message: Option<String>, attribution: Attribution, staged: bool) -> Self {
        Self {
            verb: SaveVerb::Checkpoint,
            intent: message,
            confidence: None,
            attribution,
            git_scope: if staged {
                GitScope::Staged
            } else {
                GitScope::WorktreeAll
            },
            supplied_tree: None,
            reuse_current_state: true,
            require_clean_worktree: !staged,
            require_worktree_change: false,
            worktree_status_options: WorktreeStatusOptions::default(),
            known_worktree_changes: None,
            run_hooks: true,
            coalesce_snapshot_and_checkpoint: false,
            linearize_git_parent: false,
            precomputed_worktree_status: None,
            machine_contract_input: None,
        }
    }

    pub fn with_confidence(mut self, confidence: Option<f32>) -> Self {
        self.confidence = confidence;
        self
    }

    pub fn with_supplied_tree(mut self, tree: Tree) -> Self {
        self.supplied_tree = Some(tree);
        self
    }

    pub fn with_worktree_status_options(mut self, options: WorktreeStatusOptions) -> Self {
        self.worktree_status_options = options;
        self
    }

    pub fn with_precomputed_worktree_status(
        mut self,
        status: repo::Result<Option<objects::worktree::WorktreeStatus>>,
    ) -> Self {
        self.precomputed_worktree_status = Some(status);
        self
    }
}

/// Result of a successful save.
#[derive(Debug, Clone)]
pub struct SaveReport {
    pub verb: SaveVerb,
    pub state_id: StateId,
    pub content_hash: ContentHash,
    pub intent: Option<String>,
    pub confidence: Option<f32>,
    pub signed: bool,
    pub git_commit: Option<String>,
    pub git_previous_commit: Option<String>,
    pub summary: String,
    pub principal: Principal,
    pub agent: Option<Agent>,
    pub promotion_suggested: bool,
    pub heavy_impact_paths: Vec<String>,
    /// Number of paths changed by this save relative to the state that was
    /// current when the operation began.
    pub captured_path_count: usize,
    pub verification: RepositoryVerificationState,
    pub created_new_state: bool,
    pub git_checkpoint: Option<GitCheckpointRecord>,
    pub snapshot_profile: SnapshotProfile,
    pub state_create_ms: u128,
    pub captured_path_count_ms: u128,
    pub post_verification_ms: u128,
    pub thread_metadata_ms: u128,
    pub previous_state_ms: u128,
    pub previous_state_profile: WorktreeStateLookupProfile,
    pub signature_lookup_ms: u128,
}

/// Whether this plan should create a new Heddle state (vs reusing HEAD).
pub fn plan_creates_new_state(plan: &SavePlan, has_current_state: bool) -> bool {
    if plan.supplied_tree.is_some() {
        return true;
    }
    if plan.reuse_current_state && has_current_state {
        return false;
    }
    // Checkpoint without current state still bootstraps a capture.
    if plan.verb == SaveVerb::Checkpoint && has_current_state {
        return false;
    }
    true
}

/// Whether this plan should perform a Git-overlay write-through.
pub fn plan_writes_git_checkpoint(plan: &SavePlan, capability: RepositoryCapability) -> bool {
    plan.git_scope != GitScope::None && capability == RepositoryCapability::GitOverlay
}

/// Leaf path component for Git index → Heddle tree entry names.
pub fn tree_leaf_name(path: &str) -> String {
    path.rsplit('/').next().unwrap_or(path).to_string()
}

/// Capture the current worktree as one synchronous local operation.
///
/// The implementation owns the complete semantic sequence: authority-aware
/// worktree checks, safety preflight, Heddle mutation, manual-resolution
/// completion, Git checkpointing, and final report assembly. There are no
/// genuine suspension points on this path.
pub fn capture(ctx: &ExecutionContext, options: CaptureOptions) -> Result<CaptureReport> {
    let repo = ctx.require_repo()?;
    if options.intent.trim().is_empty() {
        return Err(capture_refusal(
            "missing_capture_intent",
            "refusing to capture without an intent",
            "Provide a short intent with `heddle capture -m \"...\"`.",
            "no capture intent was supplied with -m/--message/--intent",
            "capturing without intent would create a weak provenance record",
            "repository state, refs, metadata, and worktree files were left unchanged",
            vec!["heddle capture -m \"...\"".to_string()],
        ));
    }

    preflight_unimported_git_history(repo, "capture")?;
    let complete_thread_resolution = merge_resolution_is_complete(repo)?;
    let worktree_status_started = Instant::now();
    let mut reuse_current_state = false;
    let mut no_changes = false;
    let known_worktree_changes = if complete_thread_resolution {
        None
    } else {
        let status = capture_worktree_status(repo, &ctx.worktree_status_options())?;
        if repo.capability() == RepositoryCapability::GitOverlay && status.is_clean() {
            if repo.pending_git_checkpoint_intent()?.is_some()
                || uncheckpointed_state_is_ahead_of_git(repo)?
            {
                // A prior capture may have created the Heddle state before its
                // Git write-through failed. Retrying the same verb completes
                // that state instead of manufacturing a duplicate capture.
                reuse_current_state = true;
            } else {
                no_changes = true;
            }
        }
        Some(status)
    };
    if let Some(path) = known_worktree_changes
        .as_ref()
        .and_then(reserved_capture_path)
    {
        return Err(capture_refusal(
            "reserved_materialization_path",
            format!("Refusing to capture reserved path `{path}`"),
            "Inject secrets with `heddle env run --profile <name> -- <cmd>` instead of writing `.env` files.",
            format!("`{path}` is a reserved confidential-runtime materialization path"),
            "capture would ingest reserved plaintext into Source History",
            "repository state, refs, metadata, and worktree files were left unchanged",
            vec!["heddle env run --profile <name> -- <cmd>".to_string()],
        ));
    }

    let worktree_status = repo.git_overlay_worktree_status();
    let worktree_status_ms = worktree_status_started.elapsed().as_millis();

    let preflight_started = Instant::now();
    preflight_large_capture(options.force, &worktree_status)?;
    preflight_capture_mutation(
        repo,
        &worktree_status,
        options.machine_contract_input.as_ref(),
    )?;
    if no_changes {
        return Err(map_capture_error(anyhow!(HeddleError::NoChanges)));
    }
    let preflight_ms = preflight_started.elapsed().as_millis();
    let attribution_started = Instant::now();
    let resolved_attribution = resolve_capture_attribution(
        repo,
        ctx.principal_fallback(),
        ctx.hosted_principal(),
        &options.agent,
    )?;
    let harness_session_id = resolved_attribution
        .attribution
        .agent
        .is_some()
        .then(|| resolved_attribution.harness_session_id.clone())
        .flatten();
    let mut warnings = resolved_attribution.warnings;
    let attribution_ms = attribution_started.elapsed().as_millis();

    let git_overlay = repo.capability() == RepositoryCapability::GitOverlay;
    let plan = SavePlan {
        verb: SaveVerb::Capture,
        intent: Some(options.intent),
        confidence: options.confidence,
        attribution: resolved_attribution.attribution,
        git_scope: if git_overlay {
            GitScope::WorktreeAll
        } else {
            GitScope::None
        },
        supplied_tree: None,
        reuse_current_state,
        require_clean_worktree: git_overlay,
        // Native repositories compare the built tree with their Heddle HEAD.
        // Git-overlay performs its distinct authority-aware comparison above:
        // an overlay can legitimately have no Heddle HEAD yet and still need
        // to capture an empty tree that represents deletion from Git's base.
        require_worktree_change: repo.capability() == RepositoryCapability::NativeHeddle
            && !complete_thread_resolution,
        worktree_status_options: ctx.worktree_status_options(),
        known_worktree_changes,
        run_hooks: true,
        coalesce_snapshot_and_checkpoint: git_overlay,
        // Git Overlay must extend the checkout's authoritative Git tip even
        // when the lazily-bound Heddle parent has no byte-identical mapping.
        // Otherwise the first capture after init can replace imported Git
        // history with a reconstructed metadata root.
        linearize_git_parent: git_overlay,
        precomputed_worktree_status: Some(worktree_status),
        machine_contract_input: options.machine_contract_input,
    };
    let execute_save_started = Instant::now();
    let save = execute_save(repo, plan).map_err(map_capture_error)?;
    let execute_save_ms = execute_save_started.elapsed().as_millis();
    if let Some(session_id) = harness_session_id
        && let Err(error) = crate::record_last_turn_capture(repo, &session_id, save.state_id)
    {
        warnings.push(format!(
            "could not update the reconstructible last-turn anchor: {error}"
        ));
    }

    let manual_resolution_action = if complete_thread_resolution {
        complete_current_thread_manual_resolution(repo)?
    } else {
        None
    };

    let current_thread = current_thread(repo)?;
    let captured_thread_targets_integration = current_thread
        .as_ref()
        .and_then(|thread| thread.target_thread.as_ref())
        .is_some();
    let task_assignment_id = active_task_assignment_id(repo, current_thread.as_ref())?;
    let principal_source = resolved_attribution.principal_source;
    warnings.extend(bulk_capture_warning(save.captured_path_count));

    let mut recommended_action = non_empty_action(&save.verification.recommended_action);
    let mut recommended_action_template = recommended_action
        .as_deref()
        .and_then(action_template)
        .or_else(|| save.verification.recommended_action_template.clone());
    if let Some(action) = manual_resolution_action {
        recommended_action_template = action_template(&action);
        recommended_action = Some(action);
    }

    let principal = CapturePrincipalReport {
        name: save.principal.name_lossy().into_owned(),
        email: save.principal.email_lossy().into_owned(),
    };
    let agent = save.agent.as_ref().map(|agent| CaptureAgentReport {
        provider: agent.provider.clone(),
        model: agent.model.clone(),
        session_id: agent.session_id.clone(),
        segment_id: agent.segment_id.clone(),
        policy_id: agent.policy_id.clone(),
        thought_level: agent.thought_level.clone(),
        parent: agent.parent.clone(),
    });
    Ok(CaptureReport {
        output_kind: "capture",
        state_id: save.state_id.short(),
        content_hash: save.content_hash.short(),
        git_checkpoint: save.git_commit.clone(),
        intent: save.intent.clone(),
        confidence: save.confidence,
        task_assignment_id,
        principal,
        principal_source,
        agent,
        promotion_suggested: save.promotion_suggested,
        heavy_impact_paths: save.heavy_impact_paths.clone(),
        captured_path_count: save.captured_path_count,
        warnings,
        signed: save.signed,
        message: save.summary.clone(),
        recommended_action,
        recommended_action_template,
        verification: save.verification.clone(),
        captured_thread_targets_integration,
        diagnostics: CaptureDiagnostics {
            profile: CaptureProfile {
                worktree_status_ms,
                preflight_ms,
                attribution_ms,
                execute_save_ms,
            },
            snapshot_profile: save.snapshot_profile,
            state_create_ms: save.state_create_ms,
            captured_path_count_ms: save.captured_path_count_ms,
            post_verification_ms: save.post_verification_ms,
            thread_metadata_ms: save.thread_metadata_ms,
            previous_state_ms: save.previous_state_ms,
            previous_state_profile: save.previous_state_profile,
            signature_lookup_ms: save.signature_lookup_ms,
        },
    })
}

/// Resolve attribution using explicit embedding inputs plus repository state.
///
/// This remains public for internal save paths that have not yet moved to the
/// complete [`capture`] operation. New capture callers should use [`capture`]
/// so safety checks continue to run before identity/session mutation.
fn resolve_capture_attribution(
    repo: &Repository,
    principal_fallback: Option<(&str, &str)>,
    hosted_principal: Option<(&str, &str)>,
    options: &CaptureAgentOptions,
) -> Result<CaptureAttribution> {
    let resolved_principal = crate::apply_hosted_principal_fallback(
        crate::resolve_principal(repo, principal_fallback)?,
        hosted_principal,
    );
    let principal_source = resolved_principal.source.unwrap_or("unknown").to_string();
    let principal = resolved_principal.principal;
    if crate::principal_lacks_accountable_identity(
        &principal.name_lossy(),
        &principal.email_lossy(),
    ) {
        return Err(capture_refusal(
            "capture_identity_required",
            "Refusing to capture: no accountable identity is configured",
            "Set `HEDDLE_PRINCIPAL_NAME` and `HEDDLE_PRINCIPAL_EMAIL`, or run `heddle init --principal-name <name> --principal-email <email>`, then retry the capture.",
            "Heddle would otherwise have to record Unknown <unknown@example.com> on the captured state",
            "capture would create durable Heddle history without a real principal",
            "Heddle refs, captured states, Git refs, index, and worktree files were left unchanged",
            vec![
                "heddle init --principal-name <name> --principal-email <email>".to_string(),
                "heddle capture -m \"...\"".to_string(),
            ],
        ));
    }

    if options.no_agent {
        return Ok(CaptureAttribution {
            attribution: Attribution::human(principal),
            principal_source,
            harness_session_id: None,
            warnings: Vec::new(),
        });
    }

    // Identity cursor persistence and Heddle session rotation are part of the
    // capture transaction's semantic prelude. Failure remains best-effort to
    // preserve the existing rule that missing agent metadata never blocks a
    // human-attributed capture.
    let (frozen, warnings) = match freeze_identity_for_capture(repo, &options.identity_patch) {
        Ok(frozen) => (frozen, Vec::new()),
        Err(error) => (
            FrozenCaptureIdentity::default(),
            vec![format!(
                "could not freeze agent identity for this capture; recorded human attribution: {error}"
            )],
        ),
    };
    let harness_session_id = frozen.session.clone();
    let current_session = SessionManager::new(repo.root()).get_current_session()?;
    let provider = options
        .provider
        .clone()
        .or(frozen.provider.clone())
        .and_then(clean_attribution_value);
    let model = options
        .model
        .clone()
        .or(frozen.model.clone())
        .and_then(clean_attribution_value);
    let session_policy = current_session
        .as_ref()
        .and_then(|session| session.current_segment())
        .and_then(|segment| segment.policy_id.clone())
        .and_then(clean_attribution_value);
    // Heddle Session.id — never the sidecar harness session.
    let session_id = options
        .session
        .clone()
        .or_else(|| current_session.as_ref().map(|session| session.id.clone()));
    let segment_id = options
        .segment
        .clone()
        .or(frozen.segment_id.clone())
        .or_else(|| {
            current_session
                .as_ref()
                .and_then(|session| session.current_segment_id.clone())
        });
    let policy = if options.no_policy {
        None
    } else {
        options
            .policy
            .clone()
            .or_else(|| options.environment_policy.clone())
            .and_then(clean_attribution_value)
            .or(session_policy)
            .or_else(|| options.default_policy.clone())
            .or_else(|| repo.config().policies.default_policy.clone())
    };

    let attribution = match (provider, model) {
        (Some(provider), Some(model)) => {
            let mut agent = Agent::new(provider, model);
            if let (Some(session_id), Some(segment_id)) = (session_id, segment_id) {
                agent = agent.with_session(session_id, segment_id);
            }
            if let Some(policy) = policy {
                agent = agent.with_policy(policy);
            }
            if let Some(thought_level) = frozen.thought_level {
                agent = agent.with_thought_level(thought_level);
            }
            if let Some(parent) = frozen.parent {
                agent = agent.with_parent(parent);
            }
            Attribution::with_agent(principal, agent)
        }
        _ => Attribution::human(principal),
    };
    Ok(CaptureAttribution {
        attribution,
        principal_source,
        harness_session_id,
        warnings,
    })
}

/// Resolve the author for internal save paths that already own orchestration.
///
/// Normal callers should use [`capture`], which preserves the required
/// preflight-before-attribution ordering.
pub fn resolve_capture_author(
    repo: &Repository,
    principal_fallback: Option<(&str, &str)>,
    options: &CaptureAgentOptions,
) -> Result<Attribution> {
    resolve_capture_attribution(repo, principal_fallback, None, options)
        .map(|resolved| resolved.attribution)
}

#[derive(Clone, Debug, Default)]
struct FrozenCaptureIdentity {
    provider: Option<String>,
    model: Option<String>,
    thought_level: Option<String>,
    session: Option<String>,
    parent: Option<String>,
    segment_id: Option<String>,
}

fn freeze_identity_for_capture(
    repo: &Repository,
    identity_patch: &IdentityCursor,
) -> Result<FrozenCaptureIdentity> {
    let _guard = repo.locker().write()?;
    let mut cursor = read_identity_cursor(repo.root());
    if !identity_patch.is_empty() {
        cursor = stamp_identity_cursor(repo.root(), identity_patch)?;
    }
    let mut manager = SessionManager::new(repo.root());
    let session = manager.get_current_session()?;
    let segment_id = apply_capture_segment_policy(&mut manager, session.as_ref(), &cursor)?;
    Ok(FrozenCaptureIdentity {
        provider: cursor.provider,
        model: cursor.model,
        thought_level: cursor.thought_level,
        session: cursor.session,
        parent: cursor.parent,
        segment_id,
    })
}

fn apply_capture_segment_policy(
    manager: &mut SessionManager,
    session: Option<&objects::object::Session>,
    cursor: &IdentityCursor,
) -> Result<Option<String>> {
    let Some(session) = session else {
        return Ok(None);
    };
    let current = session.current_segment();
    let rotation = cursor_segment_rotation(
        current.map(|segment| segment.provider.as_str()),
        current.map(|segment| segment.model.as_str()),
        current.and_then(|segment| segment.thought_level.as_deref()),
        cursor.provider.as_deref(),
        cursor.model.as_deref(),
        cursor.thought_level.as_deref(),
    );
    if rotation == SegmentRotation::Rotate {
        let provider = cursor
            .provider
            .clone()
            .or_else(|| current.map(|segment| segment.provider.clone()))
            .unwrap_or_default();
        let model = cursor
            .model
            .clone()
            .or_else(|| current.map(|segment| segment.model.clone()))
            .unwrap_or_default();
        if published_field(Some(&provider)).is_some() && published_field(Some(&model)).is_some() {
            let segment = manager.add_segment(&session.id, provider, model, None)?;
            if let Some(thought_level) = cursor.thought_level.clone()
                && let Some(mut updated) = manager.get_session(&session.id)?
            {
                if let Some(current) = updated.current_segment_mut() {
                    current.thought_level = Some(thought_level);
                }
                manager.save_session(&updated)?;
            }
            return Ok(Some(segment.id));
        }
    } else if rotation == SegmentRotation::Attach
        && let Some(mut updated) = manager.get_session(&session.id)?
    {
        if let Some(segment) = updated.current_segment_mut() {
            attach_published_segment_fields(
                segment,
                cursor.provider.as_deref(),
                cursor.model.as_deref(),
                cursor.thought_level.as_deref(),
            );
        }
        manager.save_session(&updated)?;
    }
    Ok(session.current_segment_id.clone())
}

fn clean_attribution_value(value: String) -> Option<String> {
    let trimmed = value.trim();
    if trimmed.is_empty() || trimmed.eq_ignore_ascii_case("unknown") {
        None
    } else {
        Some(value)
    }
}

fn preflight_unimported_git_history(repo: &Repository, action: &str) -> Result<()> {
    if repo.capability() != RepositoryCapability::GitOverlay {
        return Ok(());
    }
    let Some(guidance) = repo.git_import_guidance()? else {
        return Ok(());
    };
    if !import_guidance_includes_active_branch(&guidance) {
        return Ok(());
    }
    let branches = preview_paths(&guidance.missing_branches);
    let command = guidance.recommended_command;
    Err(capture_refusal(
        "git_history_needs_import",
        format!("Refusing to {action}: Git history has not been imported into Heddle"),
        format!("Run `{command}` before retrying `heddle {action}`."),
        format!("Git branch(es) waiting for Heddle import: {branches}"),
        format!(
            "{action} would write new Heddle state before Heddle has adopted the existing Git history"
        ),
        "Git refs, Heddle refs, and worktree files were left unchanged",
        vec![command],
    ))
}

fn preflight_capture_mutation(
    repo: &Repository,
    worktree_status: &repo::Result<Option<WorktreeStatus>>,
    machine_contract_input: Option<&MachineContractInput>,
) -> Result<()> {
    if repo.capability() != RepositoryCapability::GitOverlay {
        return Ok(());
    }
    if repo.git_overlay_head_is_detached()? {
        let primary = detached_head_primary_recovery(repo);
        return Err(capture_refusal(
            "git_head_detached",
            "Refusing to capture: Git HEAD is detached",
            format!("Run `{primary}` before retrying `heddle capture`."),
            "Git HEAD points directly to a commit instead of an attached branch",
            "capture would need to write a Git checkpoint through a branch and could reattach or advance the wrong ref",
            "Git refs, Heddle refs, Git checkpoints, and worktree files were left unchanged",
            vec![primary],
        ));
    }
    if let Some(operation) = repo.operation_status()?
        && matches!(operation.scope, OperationScope::Git)
    {
        return Err(capture_refusal(
            "raw_git_operation_in_progress",
            format!(
                "Refusing to capture: an externally-started Git {} is in progress",
                operation.kind
            ),
            format!(
                "Inspect with `heddle verify`. Heddle did not start this raw Git {}, so finish or abort it with the Git-compatible tool that started it, then run `heddle verify` for the exact adoption command before retrying `heddle capture`.",
                operation.kind
            ),
            format!(
                "Git {} is {}; Heddle cannot safely turn sequencer state into a saved change inside the no-git runtime",
                operation.kind, operation.state
            ),
            "capture would capture worktree/index contents while Git still has unresolved sequencer metadata",
            "Git refs, Git sequencer files, Heddle refs, and worktree files were left unchanged",
            vec!["heddle verify".to_string()],
        ));
    }

    let health = build_repository_verification_health_with_worktree_status(repo, worktree_status);
    let trust = if let Some(input) = machine_contract_input {
        build_repository_verification_state_with_worktree_status_and_machine_contract(
            repo,
            health,
            worktree_status,
            input,
        )
    } else {
        build_repository_verification_state_with_worktree_status(repo, health, worktree_status)
    };
    if !checkpoint_trust_allows_ref_update(&trust)
        && !checkpoint_can_close_integrated_remote_gap(repo, &trust)
    {
        let (primary, recovery_commands) = capture_blocked_recovery(repo, &trust);
        return Err(capture_refusal(
            "git_checkpoint_preflight_blocked",
            "Refusing to capture: Git checkpoint preflight is blocked",
            format!("Run `{primary}` before retrying `heddle capture`."),
            format!(
                "repository verification status is {}; remote drift is {}: {}",
                trust.status, trust.remote_drift, trust.summary
            ),
            "capture would write Heddle state before the Git checkpoint ref update is known to be safe",
            "Git refs, Heddle refs, Git checkpoint metadata, and worktree files were left unchanged",
            recovery_commands,
        ));
    }
    if trust.status != "needs_reconcile" || uncheckpointed_state_is_ahead_of_git(repo)? {
        return Ok(());
    }
    let (primary, recovery_commands) = capture_blocked_recovery(repo, &trust);
    Err(capture_refusal(
        "repository_verification_blocked",
        format!(
            "Refusing to capture: repository verification is blocked ({})",
            trust.status
        ),
        format!("Run `{primary}` before retrying `heddle capture`."),
        format!(
            "repository verification status is {}: {}",
            trust.status, trust.summary
        ),
        "capture would write new Heddle or Git state while Git and Heddle disagree",
        "Git refs, Heddle refs, Git checkpoint metadata, and worktree files were left unchanged",
        recovery_commands,
    ))
}

fn detached_head_primary_recovery(repo: &Repository) -> String {
    if let Ok(Head::Attached { thread }) = repo.refs().read_head()
        && !thread.trim().is_empty()
    {
        return if thread.starts_with('-') {
            heddle_action(["thread", "switch", "--", thread.as_str()])
        } else {
            heddle_action(["thread", "switch", thread.as_str()])
        };
    }
    if let Ok(Some(detached_commit)) = repo.git_overlay_detached_head_commit()
        && let Ok(branch_tips) = repo.git_overlay_branch_tips()
        && let Some(tip) = branch_tips
            .iter()
            .filter(|tip| tip.history_imported)
            .find(|tip| tip.git_commit == detached_commit)
    {
        return heddle_action(["thread", "switch", tip.branch.as_str()]);
    }
    heddle_action(["status"])
}

fn capture_blocked_recovery(
    repo: &Repository,
    trust: &RepositoryVerificationState,
) -> (String, Vec<String>) {
    if let Some(recovery) = capture_remote_drift_recovery(repo) {
        return recovery;
    }
    let primary =
        non_empty_action(&trust.recommended_action).unwrap_or_else(|| "heddle verify".to_string());
    let recovery_commands = if trust.recovery_commands.is_empty() {
        vec![primary.clone()]
    } else {
        trust.recovery_commands.clone()
    };
    (primary, recovery_commands)
}

fn capture_remote_drift_recovery(repo: &Repository) -> Option<(String, Vec<String>)> {
    let remote = repo.git_remote_tracking_status().ok().flatten()?;
    let status = remote_tracking_status(&remote);
    if !matches!(
        status,
        "remote_behind" | "remote_diverged" | "remote_contains_undone_checkpoint"
    ) {
        return None;
    }
    let recovery_commands = crate::status::remote_drift_recovery_commands(repo, &remote, status);
    let primary = recovery_commands.first()?.clone();
    Some((primary, recovery_commands))
}

fn checkpoint_trust_allows_ref_update(trust: &RepositoryVerificationState) -> bool {
    let status_allows_checkpoint = matches!(
        trust.status.as_str(),
        "clean" | "dirty_worktree" | "needs_checkpoint" | "remote_ahead" | "remote_untracked"
    );
    let remote_allows_checkpoint = matches!(
        trust.remote_drift.as_str(),
        "clean" | "remote_ahead" | "remote_untracked"
    );
    status_allows_checkpoint && remote_allows_checkpoint
}

fn checkpoint_can_close_integrated_remote_gap(
    repo: &Repository,
    trust: &RepositoryVerificationState,
) -> bool {
    if trust.status != "needs_checkpoint"
        || !matches!(
            trust.remote_drift.as_str(),
            "remote_behind" | "remote_diverged"
        )
    {
        return false;
    }
    let Some(remote) = repo.git_remote_tracking_status().ok().flatten() else {
        return false;
    };
    let upstream = remote.upstream.trim();
    if upstream.is_empty() {
        return false;
    }
    let Ok(Some(upstream_state)) = repo.refs().get_thread(&ThreadName::new(upstream)) else {
        return false;
    };
    let Ok(Some(current_state)) = repo.head() else {
        return false;
    };
    let mut graph = CommitGraphIndex::new(repo);
    graph
        .is_ancestor(&upstream_state, &current_state)
        .unwrap_or(false)
}

fn uncheckpointed_state_is_ahead_of_git(repo: &Repository) -> Result<bool> {
    let Some(branch) = repo.git_overlay_current_branch()? else {
        return Ok(false);
    };
    let Some(current) = repo.current_state()? else {
        return Ok(false);
    };
    if repo
        .latest_git_checkpoint_for_state(&current.state_id)?
        .is_some()
    {
        return Ok(false);
    }
    // An attached unborn branch has no Git tip to map. If the worktree already
    // matches an uncheckpointed Heddle state, capture must publish that state as
    // the branch's first commit instead of misreporting a no-op.
    let Some(tip) = repo.git_overlay_branch_tip(&branch)? else {
        return Ok(true);
    };
    let Some(mapped) = tip.mapped_state else {
        return Ok(false);
    };
    if mapped == current.state_id {
        return Ok(false);
    }
    let mut graph = CommitGraphIndex::new(repo);
    if !graph
        .is_ancestor(&mapped, &current.state_id)
        .unwrap_or(false)
        || graph
            .is_ancestor(&current.state_id, &mapped)
            .unwrap_or(false)
    {
        return Ok(false);
    }
    Ok(true)
}

fn preflight_large_capture(
    force: bool,
    worktree_status: &repo::Result<Option<WorktreeStatus>>,
) -> Result<()> {
    if force {
        return Ok(());
    }
    let Ok(Some(status)) = worktree_status else {
        return Ok(());
    };
    let total = status.change_count();
    let delete_count = status.deleted.len();
    let add_count = status.added.len();
    if !crate::large_capture_requires_force(total, delete_count, add_count) {
        return Ok(());
    }
    let sample = status
        .deleted
        .iter()
        .chain(status.added.iter())
        .chain(status.modified.iter())
        .take(5)
        .map(|path| path.display().to_string())
        .collect::<Vec<_>>()
        .join(", ");
    let sample = if sample.is_empty() {
        "no sample paths available".to_string()
    } else {
        sample
    };
    Err(capture_refusal(
        "large_capture_requires_force",
        format!(
            "Large capture safety check: this would capture {total} changed paths ({delete_count} deletions, {add_count} additions)"
        ),
        "If this is intentional, rerun with `heddle capture --force -m \"...\"`.",
        format!("sample changed paths: {sample}"),
        "capture would preserve an unusually large Git-overlay worktree change without an explicit confirmation",
        "repository state, refs, metadata, and worktree files were left unchanged",
        vec!["heddle capture --force -m \"...\"".to_string()],
    ))
}

fn merge_resolution_is_complete(repo: &Repository) -> Result<bool> {
    Ok(repo
        .merge_state_manager()
        .load()?
        .is_some_and(|merge_state| {
            merge_state
                .conflicts
                .iter()
                .all(|path| merge_state.resolved.contains(path))
        }))
}

/// Compare against Heddle's current tree before asking Git for its index-based
/// status. These are distinct authorities: Sley's Git status cannot prime
/// Heddle's persisted worktree index, which the following snapshot consumes.
/// In particular, retaining this check prevents a fast forced retry after a
/// refused directory deletion from being misclassified as an unchanged tree.
fn capture_worktree_status(
    repo: &Repository,
    options: &WorktreeStatusOptions,
) -> Result<WorktreeStatus> {
    if repo.current_state_for_worktree_status()?.is_none()
        && let Some(status) = repo.git_overlay_worktree_status()?
    {
        return Ok(status);
    }
    let tree = match repo.current_state_for_worktree_status()? {
        Some(state) => repo.require_tree_for_worktree_status(&state.tree)?,
        None => Tree::new(),
    };
    Ok(repo.compare_worktree_cached_with_options(&tree, options)?)
}

/// Complete a captured manual resolution and return its contextual land action.
///
/// This is shared by capture and the operator continuation path so the thread
/// metadata/ref/oplog transaction has one implementation.
pub fn complete_current_thread_manual_resolution(repo: &Repository) -> Result<Option<String>> {
    let Some(current_thread) = repo.current_lane()? else {
        return Ok(None);
    };
    let Some(current_state) = repo.head()? else {
        return Ok(None);
    };
    let Some(current_state_object) = repo.store().get_state(&current_state)? else {
        return Ok(None);
    };
    let manager = ThreadManager::new(repo.heddle_dir());
    let Some(mut thread) = manager.find_by_thread(&current_thread)? else {
        return Ok(None);
    };
    let Some(target_thread) = thread.target_thread.clone() else {
        return Ok(None);
    };
    let Some(target_state) = repo.refs().get_thread(&ThreadName::new(&target_thread))? else {
        return Ok(None);
    };
    let Some(target_state_object) = repo.store().get_state(&target_state)? else {
        return Ok(None);
    };
    let before = crate::capture_thread_update_before(repo, &manager, &thread)?;

    thread.base_state = target_state.short();
    thread.base_root = target_state_object.tree.short();
    update_thread_state_from_state(&mut thread, &current_state_object);
    thread.state = ThreadState::Ready;
    thread.freshness = ThreadFreshness::Current;
    thread.integration_policy_result = ThreadIntegrationPolicy {
        status: Some("manual_resolved".to_string()),
        reason: Some("manual conflict resolution captured".to_string()),
        manual_resolution_state: Some(current_state.short()),
        conflicts_resolved_manually: true,
    };
    thread.updated_at = Utc::now();
    let thread_name = thread.thread.clone();
    let target = thread.target_thread.clone();
    crate::save_thread_update(repo, &manager, &thread, before, current_state)?;

    Ok(Some(manual_resolution_land_action(
        repo,
        &thread_name,
        target.as_deref(),
    )))
}

fn manual_resolution_land_action(
    repo: &Repository,
    thread_id: &str,
    target_thread: Option<&str>,
) -> String {
    let action = crate::status::next_action::land_local_command(thread_id);
    contextual_thread_action(repo, thread_id, target_thread, &action)
}

fn current_thread(repo: &Repository) -> Result<Option<Thread>> {
    let manager = ThreadManager::new(repo.heddle_dir());
    if let Some(thread) = manager.find_by_execution_root(repo.root())? {
        return Ok(Some(thread));
    }
    let Head::Attached { thread } = repo.head_ref()? else {
        return Ok(None);
    };
    let current_state_id = repo.refs().get_thread(&thread)?;
    let current_state = current_state_id.map(|state| state.short());
    let base_root = current_state_id
        .and_then(|state| repo.store().get_state(&state).ok().flatten())
        .map(|state| state.tree.short())
        .unwrap_or_default();
    let thread = thread.to_string();
    Ok(Some(Thread {
        id: thread.clone(),
        thread,
        target_thread: None,
        parent_thread: None,
        mode: ThreadMode::Materialized,
        state: ThreadState::Active,
        base_state: current_state.clone().unwrap_or_default(),
        base_root,
        current_state,
        merged_state: None,
        task: None,
        execution_path: repo.root().to_path_buf(),
        materialized_path: None,
        changed_paths: Vec::new(),
        impact_categories: Vec::new(),
        heavy_impact_paths: Vec::new(),
        promotion_suggested: false,
        freshness: ThreadFreshness::Unknown,
        verification_summary: Default::default(),
        confidence_summary: Default::default(),
        integration_policy_result: Default::default(),
        created_at: Utc::now(),
        updated_at: Utc::now(),
        ephemeral: None,
        auto: false,
        shared_target_dir: None,
    }))
}

fn active_task_assignment_id(repo: &Repository, thread: Option<&Thread>) -> Result<Option<String>> {
    let Some(thread) = thread else {
        return Ok(None);
    };
    let store = ActorPresenceStore::new(repo.heddle_dir());
    Ok(store
        .active_entries()?
        .into_iter()
        .filter(|entry| entry.thread == thread.thread || entry.thread == thread.id)
        .max_by_key(|entry| entry.started_at)
        .and_then(|entry| entry.task_assignment_id))
}

fn bulk_capture_warning(captured_path_count: usize) -> Option<String> {
    (captured_path_count >= BULK_CAPTURE_WARNING_THRESHOLD).then(|| {
        format!(
            "captured {captured_path_count} paths in one operation; check root .gitignore and .heddleignore rules if build artifacts or tool state were included"
        )
    })
}

/// Return the first added or modified confidential-runtime materialization
/// path selected by the capture's authoritative worktree observation. Deleted
/// paths remove plaintext and ignored paths are not part of the capture, so
/// neither should block the operation.
fn reserved_capture_path(status: &WorktreeStatus) -> Option<String> {
    status
        .added
        .iter()
        .chain(&status.modified)
        .map(|path| path.to_string_lossy())
        .find(|path| env_store::is_reserved_materialization_path(path))
        .map(|path| path.into_owned())
}

fn non_empty_action(action: &str) -> Option<String> {
    (!action.trim().is_empty()).then(|| action.to_string())
}

fn map_capture_error(error: anyhow::Error) -> anyhow::Error {
    if error.chain().any(|cause| {
        cause
            .downcast_ref::<HeddleError>()
            .is_some_and(|error| matches!(error, HeddleError::NoChanges))
    }) {
        return capture_refusal(
            "nothing_to_capture",
            "nothing to capture: worktree has no changes eligible for Heddle capture",
            "Inspect the worktree with `heddle status`; make changes before running `heddle capture -m \"...\"`.",
            "the worktree has no modified, deleted, or untracked paths relative to the current Heddle state",
            "capture would not create a meaningful Heddle state",
            "repository state was left unchanged",
            vec!["heddle status".to_string()],
        );
    }
    if error.chain().any(|cause| {
        cause
            .downcast_ref::<std::io::Error>()
            .is_some_and(objects::fs_atomic::is_out_of_space)
    }) {
        return capture_refusal(
            "capture_out_of_space",
            format!("Capture aborted because the filesystem is out of space: {error:#}"),
            "Free disk space and re-run `heddle capture`. Your working tree changes are intact.",
            "the filesystem reported no remaining space while Heddle was writing captured objects",
            "retrying before freeing space may fail again or leave another incomplete object write",
            "the working tree was not modified; already-committed repository data remains behind atomic write boundaries",
            vec!["heddle capture -m \"...\"".to_string()],
        );
    }
    error
}

#[allow(clippy::too_many_arguments)]
fn capture_refusal(
    kind: &'static str,
    error: impl Into<String>,
    hint: impl Into<String>,
    unsafe_condition: impl Into<String>,
    would_change: impl Into<String>,
    preserved: impl Into<String>,
    recovery_commands: Vec<String>,
) -> anyhow::Error {
    anyhow!(HeddleError::recovery(
        RecoveryDetails::safety_refusal(
            kind,
            error,
            hint,
            unsafe_condition,
            would_change,
            preserved,
        )
        .with_recovery_commands(recovery_commands),
    ))
}

fn preview_paths(paths: &[String]) -> String {
    let shown = paths
        .iter()
        .take(12)
        .cloned()
        .collect::<Vec<_>>()
        .join(", ");
    let hidden = paths.len().saturating_sub(12);
    if hidden == 0 {
        shown
    } else {
        format!("{shown}, and {hidden} more")
    }
}

/// Execute a save: optional Heddle snapshot + optional Git checkpoint write-through.
///
/// Callers own clap validation (missing message/intent) and plain-Git refusal.
/// Mutation composition, hooks, thread metadata, Git write-through, and post
/// verification live here.
pub fn execute_save(repo: &Repository, plan: SavePlan) -> Result<SaveReport> {
    // A plan that asks for a Git checkpoint on a non-overlay repo is a hard
    // error: `plan_writes_git_checkpoint` silently returns false for native
    // repos, so guard on the raw `git_scope` intent instead (the previous
    // `plan_writes_git_checkpoint(..) && capability != GitOverlay` was
    // self-contradictory and never fired).
    if plan.git_scope != GitScope::None && repo.capability() != RepositoryCapability::GitOverlay {
        return Err(anyhow!(HeddleError::recovery(
            RecoveryDetails::safety_refusal(
                "native_checkpoint_unavailable",
                "Git checkpointing is only available in Git-overlay repositories",
                "Use `heddle capture -m \"...\"` to save Heddle state in a native checkout.",
                "this checkout is not a Git-overlay repository",
                "checkpoint would try to write a Git commit where no active Git store is bound",
                "repository state, refs, and worktree files were left unchanged",
            ),
        )));
    }

    let previous_state_started = Instant::now();
    let (previous_state, previous_state_profile) =
        repo.current_state_for_worktree_status_profiled()?;
    let previous_state_ms = previous_state_started.elapsed().as_millis();
    let native_thread_name = match repo.head_ref()? {
        refs::Head::Attached { thread } => Some(thread.to_string()),
        refs::Head::Detached { .. } => None,
    };
    if let (Some(name), Some(previous)) = (native_thread_name.as_deref(), previous_state.as_ref())
        && repo.native_thread(name).is_err()
    {
        repo.create_native_thread(name, previous.state_id, None, "")?;
    }
    let actor = format!("cli:{}", std::process::id());
    let _checkout_writer = match native_thread_name.as_deref() {
        Some(name) => match repo.native_thread(name) {
            Ok(replica) => Some(repo.acquire_checkout_writer(replica.thread_id(), &actor)?),
            Err(_) => None,
        },
        None => match repo::thread_replication::checkout::ThreadCheckout::open(repo.root()) {
            Ok(checkout) => Some(repo.acquire_checkout_writer(checkout.binding.thread, &actor)?),
            Err(_) => None,
        },
    };
    let has_current = previous_state.is_some();
    let mut created_new_state = false;
    let mut snapshot_profile = SnapshotProfile::default();
    let mut thread_metadata_ms = 0u128;
    let mut promotion_suggested = false;
    let mut heavy_impact_paths = Vec::new();
    let mut snapshot_state_id: Option<StateId> = None;
    let mut captured_path_count = 0usize;
    let mut state_create_ms = 0u128;
    let mut captured_path_count_ms = 0u128;

    let mut state = if plan_creates_new_state(&plan, has_current) {
        created_new_state = true;
        let state_create_started = Instant::now();
        let execution = create_heddle_state(repo, &plan)?;
        state_create_ms = state_create_started.elapsed().as_millis();
        snapshot_profile = execution.profile;
        thread_metadata_ms = execution.thread_metadata_ms;
        promotion_suggested = execution.promotion_suggested;
        heavy_impact_paths = execution.heavy_impact_paths;
        snapshot_state_id = Some(execution.state.state_id);
        let previous_tree = match previous_state.as_ref() {
            Some(state) => state.tree,
            None => repo.store().put_tree(&Tree::new())?,
        };
        let captured_path_count_started = Instant::now();
        captured_path_count = repo
            .diff_trees(&previous_tree, &execution.state.tree)?
            .len();
        captured_path_count_ms = captured_path_count_started.elapsed().as_millis();
        execution.state
    } else {
        repo.current_state()?
            .ok_or_else(|| anyhow!("no captured state found for save"))?
    };

    let mut git_commit = None;
    let mut git_previous_commit = None;
    let mut git_checkpoint = None;

    if plan_writes_git_checkpoint(&plan, repo.capability()) {
        if plan.require_clean_worktree {
            let tree = repo.require_tree(&state.tree)?;
            let status = repo.compare_worktree_cached_detailed_with_options(
                &tree,
                &plan.worktree_status_options,
            )?;
            if !status.is_clean() {
                return Err(anyhow!(HeddleError::recovery(
                    RecoveryDetails::safety_refusal(
                        "dirty_worktree",
                        "Save worktree changes before checkpointing",
                        "Save the work with `heddle capture -m \"...\"`.",
                        "the current Heddle state was left unchanged; these paths have not been captured",
                        "a Git checkpoint would omit dirty worktree paths",
                        "the current Heddle state was left unchanged; these paths have not been captured",
                    ),
                )));
            }
        }

        if let Some(existing) = repo.latest_git_checkpoint_for_state(&state.state_id)?
            && repo.pending_git_checkpoint_intent()?.is_none()
        {
            git_commit = Some(existing.git_commit.clone());
            git_checkpoint = Some(existing);
        } else {
            let previous = repo
                .pending_git_checkpoint_intent()?
                .and_then(|intent| intent.previous_git_oid)
                .or_else(|| git_rev_parse_head(repo.root()));
            git_previous_commit = previous.clone();
            let summary = checkpoint_summary(&plan, &state);
            let record = write_git_checkpoint(repo, &state, summary, plan.linearize_git_parent)?;
            if plan.coalesce_snapshot_and_checkpoint
                && let Some(state_id) = snapshot_state_id.as_ref()
            {
                coalesce_snapshot_and_checkpoint(repo, state_id, &record.git_commit)?;
            }
            git_commit = Some(record.git_commit.clone());
            git_checkpoint = Some(record);
        }
    }

    // Post-mutation verification is always fresh when we created state or wrote
    // a Git checkpoint (those mutations flip health classification). Otherwise
    // reuse a caller-supplied worktree status to avoid a redundant walk.
    let captured_native_worktree = created_new_state
        && plan.supplied_tree.is_none()
        && repo.capability() == RepositoryCapability::NativeHeddle;
    let captured_worktree_status = Ok(Some(objects::worktree::WorktreeStatus::default()));
    let verification_started = Instant::now();
    let verification = if captured_native_worktree && git_checkpoint.is_none() {
        let health = build_repository_verification_health_with_worktree_status(
            repo,
            &captured_worktree_status,
        );
        if let Some(input) = &plan.machine_contract_input {
            build_repository_verification_state_with_worktree_status_and_machine_contract(
                repo,
                health,
                &captured_worktree_status,
                input,
            )
        } else {
            build_repository_verification_state_with_worktree_status(
                repo,
                health,
                &captured_worktree_status,
            )
        }
    } else if created_new_state || git_checkpoint.is_some() {
        if let Some(input) = &plan.machine_contract_input {
            build_repository_verification_state_with_machine_contract(repo, input)?
        } else {
            build_repository_verification_state(repo)?
        }
    } else if let Some(status) = &plan.precomputed_worktree_status {
        let health = build_repository_verification_health_with_worktree_status(repo, status);
        if let Some(input) = &plan.machine_contract_input {
            build_repository_verification_state_with_worktree_status_and_machine_contract(
                repo, health, status, input,
            )
        } else {
            build_repository_verification_state_with_worktree_status(repo, health, status)
        }
    } else {
        if let Some(input) = &plan.machine_contract_input {
            build_repository_verification_state_with_machine_contract(repo, input)?
        } else {
            build_repository_verification_state(repo)?
        }
    };
    let post_verification_ms = verification_started.elapsed().as_millis();

    let summary = match plan.verb {
        SaveVerb::Capture => format!(
            "Captured state {} ({})",
            state.state_id.short(),
            state.hash().short()
        ),
        SaveVerb::Checkpoint => git_checkpoint
            .as_ref()
            .map(|r| r.summary.clone())
            .unwrap_or_else(|| format!("Checkpoint {}", state.state_id.short())),
    };

    if created_new_state && let Some(name) = native_thread_name.as_deref() {
        if repo.native_thread(name).is_err() {
            repo.create_native_thread(
                name,
                previous_state
                    .as_ref()
                    .map(|previous| previous.state_id)
                    .unwrap_or(state.state_id),
                None,
                "",
            )?;
        }
        let genesis_base = repo.native_thread(name)?.genesis()?.base;
        if state.state_id != genesis_base && !state.parents.is_empty() {
            repo.record_native_capture(name, state.state_id)?;
        }
    }
    let signature_lookup_started = Instant::now();
    let signed = repo.get_state_signature(&state.id())?.is_some();
    let signature_lookup_ms = signature_lookup_started.elapsed().as_millis();
    Ok(SaveReport {
        verb: plan.verb,
        state_id: state.state_id,
        content_hash: state.hash(),
        intent: state.intent.clone(),
        confidence: state.confidence,
        signed,
        git_commit,
        git_previous_commit,
        summary,
        principal: state.attribution.principal.clone(),
        agent: state.attribution.agent.clone(),
        promotion_suggested,
        heavy_impact_paths,
        captured_path_count,
        verification,
        created_new_state,
        git_checkpoint,
        snapshot_profile,
        state_create_ms,
        captured_path_count_ms,
        post_verification_ms,
        thread_metadata_ms,
        previous_state_ms,
        previous_state_profile,
        signature_lookup_ms,
    })
}

struct CreatedState {
    state: State,
    profile: SnapshotProfile,
    thread_metadata_ms: u128,
    promotion_suggested: bool,
    heavy_impact_paths: Vec<String>,
}

fn create_heddle_state(repo: &Repository, plan: &SavePlan) -> Result<CreatedState> {
    let hook_manager = HookManager::new(repo);
    let hook_ctx = HookContext::new(repo);
    let mut post_hook_worktree_changes = None;

    if plan.run_hooks {
        let pre_snapshot_ran = hook_manager.run(Hook::PreSnapshot, &hook_ctx)?;
        let pre_capture_payload = serde_json::json!({
            "thread": current_thread_name(repo),
            "intent": plan.intent.clone().unwrap_or_default(),
        });
        let pre_capture_response = hook_manager.run_with_payload(
            Hook::PreSnapshot,
            &hook_ctx,
            &pre_capture_payload,
            std::time::Duration::from_secs(5),
        )?;
        if let Some(resp) = pre_capture_response
            && !resp.abort.is_empty()
        {
            return Err(anyhow!(HeddleError::recovery(
                RecoveryDetails::safety_refusal(
                    "hook_veto",
                    format!("pre_capture hook vetoed: {}", resp.abort),
                    "Inspect `pre_capture` with `heddle hook list`, update the hook policy or inputs, then retry.",
                    format!("pre_capture hook vetoed capture: {}", resp.abort),
                    "capture would continue after repository policy explicitly aborted the operation",
                    "the operation stopped at the hook boundary before the protected action ran",
                )
                .with_recovery_commands(vec!["heddle hook list".to_string()]),
            )));
        }
        if pre_snapshot_ran && plan.supplied_tree.is_none() {
            // Hooks can mutate paths outside capture's preflight set. Rewalk
            // authoritatively so a settled monitor token cannot vouch for a
            // tree built from that stale set. No-hook captures keep the fast path.
            let authoritative_options = WorktreeStatusOptions {
                fsmonitor: repo::FsMonitorSettings {
                    mode: repo::FsMonitorMode::Off,
                },
            };
            post_hook_worktree_changes =
                Some(capture_worktree_status(repo, &authoritative_options)?);
        }
    }
    let mut execution = if let Some(tree) = plan.supplied_tree.clone() {
        repo.snapshot_tree_with_attribution_profiled(
            tree,
            plan.intent.clone(),
            plan.confidence,
            plan.attribution.clone(),
        )?
    } else if let Some(status) =
        post_hook_worktree_changes.or_else(|| plan.known_worktree_changes.clone())
    {
        repo.snapshot_with_attribution_profiled_from_status(
            plan.intent.clone(),
            plan.confidence,
            plan.attribution.clone(),
            status,
            plan.require_worktree_change,
        )?
    } else if plan.require_worktree_change {
        repo.snapshot_with_attribution_profiled_if_changed(
            plan.intent.clone(),
            plan.confidence,
            plan.attribution.clone(),
        )?
    } else {
        repo.snapshot_with_attribution_profiled(
            plan.intent.clone(),
            plan.confidence,
            plan.attribution.clone(),
        )?
    };

    let thread_metadata_start = Instant::now();
    let refresh = refresh_active_thread_metadata(repo, &execution.state, &execution.tree)?;
    let thread_metadata_ms = thread_metadata_start.elapsed().as_millis();

    if plan.run_hooks {
        hook_manager.run(Hook::PostSnapshot, &hook_ctx)?;
        let post_capture_payload = serde_json::json!({
            "state_id": execution.state.state_id.to_string_full(),
        });
        if let Err(err) = hook_manager.run_with_payload(
            Hook::PostSnapshot,
            &hook_ctx,
            &post_capture_payload,
            std::time::Duration::from_secs(5),
        ) {
            tracing::warn!(error = %err, "post_capture hook error swallowed");
        }
    }

    Ok(CreatedState {
        state: execution.state,
        profile: std::mem::take(&mut execution.profile),
        thread_metadata_ms,
        promotion_suggested: refresh.promotion_suggested,
        heavy_impact_paths: refresh.heavy_impact_paths,
    })
}

fn write_git_checkpoint(
    repo: &Repository,
    state: &State,
    summary: String,
    linearize_git_parent: bool,
) -> Result<GitCheckpointRecord> {
    let _lock = repo.locker().write()?;
    objects::fault_inject::maybe_fail_at("git_checkpoint_before_write_through")?;
    let mut bridge = GitProjection::new(repo);
    if linearize_git_parent {
        bridge.linearize_unmapped_tip_to_checkout();
    }
    let git_commit = match bridge
        .write_through_current_checkout_with_message(state.state_id, summary.clone())?
    {
        WriteThroughOutcome::Wrote(git_commit) => git_commit.to_string(),
        WriteThroughOutcome::Skipped(reason) => {
            return Err(anyhow!(HeddleError::recovery(
                RecoveryDetails::safety_refusal(
                    "checkpoint_git_write_skipped",
                    format!("Git checkpoint write-through was skipped: {reason}"),
                    "Inspect `heddle verify`, resolve the skip reason, then retry `heddle land`.",
                    format!("write-through skipped: {reason}"),
                    "checkpoint would need to write the current Heddle state into the Git branch and index",
                    "the current Heddle state was preserved; no Git checkpoint record was written",
                ),
            )));
        }
    };
    let intent = repo.pending_git_checkpoint_intent()?.ok_or_else(|| {
        anyhow!("Git checkpoint published without its durable finalization intent")
    })?;
    if intent.phase != repo::GitCheckpointIntentPhase::Published
        || intent.state_id != state.state_id.to_string_full()
        || intent.new_git_oid != git_commit
    {
        return Err(anyhow!(
            "published Git checkpoint does not match its durable finalization intent"
        ));
    }
    finalize_published_git_checkpoint(repo, &state.state_id, git_commit, summary, intent)
}

/// Finish the metadata/oplog half of a checkpoint whose Git ref was already
/// published before a crash. Returns `None` when no matching published intent
/// exists, so callers can continue with their own recovery policy.
pub fn recover_published_git_checkpoint(
    repo: &Repository,
    state_id: &StateId,
) -> Result<Option<GitCheckpointRecord>> {
    let _lock = repo.locker().write()?;
    let Some(mut intent) = repo.pending_git_checkpoint_intent()? else {
        return Ok(None);
    };
    if intent.state_id != state_id.to_string_full() {
        return Ok(None);
    }
    let current_branch = repo.git_overlay_current_branch()?;
    if current_branch.as_deref() != Some(intent.branch.as_str()) {
        return Err(anyhow!(
            "pending Git checkpoint targets branch '{}' but the checkout is on '{}'",
            intent.branch,
            current_branch.as_deref().unwrap_or("detached HEAD")
        ));
    }
    let current_oid = git_rev_parse_head(repo.root());
    if intent.phase == repo::GitCheckpointIntentPhase::Prepared {
        if current_oid == intent.previous_git_oid {
            return Ok(None);
        }
        if current_oid.as_deref() != Some(intent.new_git_oid.as_str()) {
            return Err(anyhow!(
                "prepared Git checkpoint expected HEAD at {} or {}, found {}",
                intent.previous_git_oid.as_deref().unwrap_or("<unborn>"),
                intent.new_git_oid,
                current_oid.as_deref().unwrap_or("<unborn>")
            ));
        }
        let git_oid = intent.new_git_oid.clone();
        intent = repo.mark_git_checkpoint_published(state_id, &git_oid)?;
    }
    if intent.phase != repo::GitCheckpointIntentPhase::Published {
        return Ok(None);
    }
    if current_oid.as_deref() != Some(intent.new_git_oid.as_str()) {
        return Err(anyhow!(
            "published Git checkpoint expected HEAD at {}, found {}",
            intent.new_git_oid,
            current_oid.as_deref().unwrap_or("<unborn>")
        ));
    }
    let git_commit = intent.new_git_oid.clone();
    let summary = intent.summary.clone();
    finalize_published_git_checkpoint(repo, state_id, git_commit, summary, intent).map(Some)
}

fn finalize_published_git_checkpoint(
    repo: &Repository,
    state_id: &StateId,
    git_commit: String,
    summary: String,
    intent: repo::GitCheckpointIntent,
) -> Result<GitCheckpointRecord> {
    let record = repo.record_git_checkpoint(state_id, git_commit.clone(), summary)?;
    objects::fault_inject::maybe_panic_at("git_checkpoint_after_metadata_before_oplog");
    let transaction_id = format!(
        "git-checkpoint:v1:{}:{}",
        state_id.to_string_full(),
        git_commit
    );
    repo.oplog().record_batch_exactly_once(
        vec![
            OpRecord::GitCheckpoint {
                branch: intent.branch,
                state: *state_id,
                previous_git_oid: intent.previous_git_oid,
                new_git_oid: git_commit.clone(),
            },
            OpRecord::TransactionCommit {
                transaction_id: transaction_id.clone(),
                op_count: 1,
            },
        ],
        Some(&repo.op_scope()),
        &transaction_id,
    )?;
    objects::fault_inject::maybe_panic_at("git_checkpoint_after_oplog_before_finalize");
    repo.finish_git_checkpoint_intent(state_id, &git_commit)?;
    Ok(record)
}

fn coalesce_snapshot_and_checkpoint(
    repo: &Repository,
    state_id: &StateId,
    git_commit: &str,
) -> Result<()> {
    let snapshot_batch = repo
        .oplog()
        .recent_batches_scoped(8, Some(&repo.op_scope()))?
        .into_iter()
        .find(|batch| {
            batch.entries.iter().any(|entry| {
                matches!(
                    &entry.operation,
                    OpRecord::Snapshot { new_state, .. } if new_state == state_id
                )
            })
        })
        .ok_or_else(|| anyhow!("capture succeeded but its oplog batch was not found"))?;
    let checkpoint_batch = repo
        .oplog()
        .recent_batches_scoped(8, Some(&repo.op_scope()))?
        .into_iter()
        .find(|batch| {
            batch.entries.iter().any(|entry| {
                matches!(
                    &entry.operation,
                    OpRecord::GitCheckpoint { new_git_oid, .. } if new_git_oid == git_commit
                )
            })
        })
        .ok_or_else(|| anyhow!("Git checkpoint succeeded but its oplog batch was not found"))?;
    repo.oplog()
        .coalesce_batches(snapshot_batch.id, checkpoint_batch.id)
        .context(
            "capture completed but failed to record its state and Git checkpoint as one undo batch",
        )?;
    Ok(())
}

fn checkpoint_summary(plan: &SavePlan, state: &State) -> String {
    plan.intent
        .clone()
        .or_else(|| state.intent.clone())
        .unwrap_or_else(|| format!("Checkpoint {}", state.state_id.short()))
}

fn current_thread_name(repo: &Repository) -> String {
    match repo.head_ref() {
        Ok(Head::Attached { thread }) => thread.to_string(),
        _ => String::new(),
    }
}

fn git_rev_parse_head(root: &std::path::Path) -> Option<String> {
    let git = SleyRepository::discover(root).ok()?;
    git.head().ok()?.oid.map(|id| id.to_string())
}

#[cfg(test)]
mod tests {
    use repo::RepositoryCapability;
    use tempfile::TempDir;

    use super::*;

    #[test]
    fn capture_interface_owns_mutation_and_returns_the_report_contract() {
        let temp = TempDir::new().expect("create temp repository");
        let repo = Repository::init_default(temp.path()).expect("initialize repository");
        std::fs::write(temp.path().join("tracked.txt"), "captured\n")
            .expect("write worktree change");
        let ctx = ExecutionContext::builder()
            .repo(repo)
            .principal_fallback(Some(("Ada".into(), "ada@example.com".into())))
            .build();
        let report = capture(
            &ctx,
            CaptureOptions {
                intent: "exercise the deep capture interface".into(),
                confidence: Some(0.9),
                force: false,
                agent: CaptureAgentOptions::default(),
                machine_contract_input: None,
            },
        )
        .expect("capture succeeds");

        assert_eq!(report.output_kind, "capture");
        assert_eq!(report.captured_path_count, 1);
        assert_eq!(report.principal.name, "Ada");
        assert_eq!(report.principal.email, "ada@example.com");
        assert_eq!(report.principal_source, "user_config");
        assert_eq!(CaptureReport::CONTRACT.schema_name, "capture");
        assert_eq!(
            ctx.require_repo()
                .expect("repository")
                .head()
                .expect("read head")
                .expect("captured head")
                .short(),
            report.state_id
        );

        let wire = serde_json::to_value(&report).expect("serialize report");
        assert_eq!(wire["output_kind"], "capture");
        assert!(wire.get("diagnostics").is_none());
        assert!(wire.get("captured_thread_targets_integration").is_none());
    }

    #[test]
    fn manual_resolution_land_action_quotes_untrusted_thread_ids() {
        let temp = TempDir::new().expect("create temp repository");
        let repo = Repository::init_default(temp.path()).expect("initialize repository");

        assert_eq!(
            manual_resolution_land_action(&repo, "bad;echo pwn", None),
            "heddle land --thread 'bad;echo pwn'"
        );
        assert_eq!(
            manual_resolution_land_action(&repo, "-danger", None),
            "heddle land --thread=-danger"
        );
    }

    #[test]
    fn clean_overlay_refuses_before_requiring_identity() {
        let temp = TempDir::new().expect("create temp repository");
        SleyRepository::init(temp.path()).expect("initialize Git repository");
        let repo = Repository::init_git_overlay_sidecar(temp.path())
            .expect("initialize Git-overlay sidecar");
        let ctx = ExecutionContext::builder().repo(repo).build();

        let error = capture(
            &ctx,
            CaptureOptions {
                intent: "nothing changed".into(),
                confidence: None,
                force: false,
                agent: CaptureAgentOptions::default(),
                machine_contract_input: None,
            },
        )
        .expect_err("clean overlay must refuse capture");

        assert!(error.to_string().contains("nothing to capture"));
    }

    #[test]
    fn capture_rejects_missing_intent_before_mutation() {
        let temp = TempDir::new().expect("create temp repository");
        let repo = Repository::init_default(temp.path()).expect("initialize repository");
        std::fs::write(temp.path().join("tracked.txt"), "uncaptured\n")
            .expect("write worktree change");
        let ctx = ExecutionContext::builder()
            .repo(repo)
            .principal_fallback(Some(("Ada".into(), "ada@example.com".into())))
            .build();
        let before = ctx.require_repo().expect("repository").head().unwrap();

        let error = capture(
            &ctx,
            CaptureOptions {
                intent: "   ".into(),
                confidence: None,
                force: false,
                agent: CaptureAgentOptions::default(),
                machine_contract_input: None,
            },
        )
        .expect_err("blank intent must be rejected by the operation interface");

        assert!(
            error
                .to_string()
                .contains("refusing to capture without an intent")
        );
        assert_eq!(
            ctx.require_repo().expect("repository").head().unwrap(),
            before
        );
    }

    #[test]
    fn attribution_cleaning_only_rejects_the_placeholder_token() {
        assert_eq!(clean_attribution_value("  unknown  ".into()), None);
        assert_eq!(clean_attribution_value("   ".into()), None);
        assert_eq!(
            clean_attribution_value("unknown-model-v2".into()),
            Some("unknown-model-v2".into())
        );
    }

    #[test]
    fn identity_freeze_waits_for_the_repository_write_lock() {
        use std::{sync::mpsc, time::Duration};

        let temp = TempDir::new().expect("create temp repository");
        let repo = Repository::init_default(temp.path()).expect("initialize repository");
        let hold = repo.locker().write().expect("hold repository lock");
        let root = repo.root().to_path_buf();
        let (tx, rx) = mpsc::channel();
        let worker = std::thread::spawn(move || {
            let repo = Repository::open(root).expect("open worker repository");
            let patch = IdentityCursor {
                provider: Some("anthropic".into()),
                model: Some("opus".into()),
                ..IdentityCursor::default()
            };
            let frozen = freeze_identity_for_capture(&repo, &patch);
            let _ = tx.send(frozen.is_ok());
        });

        assert!(
            rx.recv_timeout(Duration::from_millis(150)).is_err(),
            "identity mutation must wait for the repository lock"
        );
        drop(hold);
        assert!(
            rx.recv_timeout(Duration::from_secs(2))
                .expect("worker should finish after lock release")
        );
        worker.join().expect("join identity worker");
    }

    #[test]
    fn reserved_capture_paths_consider_selected_additions_and_modifications_only() {
        let status = WorktreeStatus {
            added: vec![std::path::PathBuf::from("services/api/.env.local")],
            modified: Vec::new(),
            deleted: vec![std::path::PathBuf::from("old/.env")],
        };
        assert_eq!(
            reserved_capture_path(&status).as_deref(),
            Some("services/api/.env.local")
        );

        let deletion_only = WorktreeStatus {
            deleted: vec![std::path::PathBuf::from(".env")],
            ..WorktreeStatus::default()
        };
        assert!(reserved_capture_path(&deletion_only).is_none());
    }

    #[test]
    fn plan_creates_new_state_routing() {
        let attr = Attribution::human(Principal::new("Ada", "ada@example.com"));
        let capture = SavePlan::capture("wip", attr.clone());
        assert!(plan_creates_new_state(&capture, true));
        assert!(plan_creates_new_state(&capture, false));

        let checkpoint = SavePlan::checkpoint(Some("cp".into()), attr.clone(), false);
        assert!(!plan_creates_new_state(&checkpoint, true));
        assert!(plan_creates_new_state(&checkpoint, false));

        let staged =
            SavePlan::checkpoint(Some("cp".into()), attr, true).with_supplied_tree(Tree::new());
        assert!(plan_creates_new_state(&staged, true));
    }

    #[test]
    fn plan_writes_git_checkpoint_respects_scope_and_capability() {
        let attr = Attribution::human(Principal::new("Ada", "ada@example.com"));
        let mut capture = SavePlan::capture("wip", attr);
        assert!(!plan_writes_git_checkpoint(
            &capture,
            RepositoryCapability::GitOverlay
        ));
        capture.git_scope = GitScope::WorktreeAll;
        assert!(plan_writes_git_checkpoint(
            &capture,
            RepositoryCapability::GitOverlay
        ));
        assert!(!plan_writes_git_checkpoint(
            &capture,
            RepositoryCapability::NativeHeddle
        ));
    }

    #[test]
    fn save_plan_builders_set_expected_defaults() {
        let attr = Attribution::human(Principal::new("Ada", "ada@example.com"));
        let capture = SavePlan::capture("intent", attr.clone());
        assert_eq!(capture.verb, SaveVerb::Capture);
        assert_eq!(capture.git_scope, GitScope::None);
        assert!(!capture.coalesce_snapshot_and_checkpoint);

        let staged = SavePlan::checkpoint(None, attr, true);
        assert_eq!(staged.git_scope, GitScope::Staged);
        assert!(!staged.require_clean_worktree);
        assert!(staged.reuse_current_state);
    }

    #[test]
    fn tree_leaf_name_returns_the_final_component() {
        assert_eq!(tree_leaf_name("a/b/c.rs"), "c.rs");
        assert_eq!(tree_leaf_name("solo"), "solo");
    }
}