Enum Surface 

pub enum Surface {
    Routing,
    Declagent,
    Conversation,
    Knowledge,
    Skill,
    Registry {
        kind: String,
    },
    Trajectory,
    Run,
    Intent,
}

Which persisted surface an op mutates — the proposal’s surfaces.

Intent (B5) is a leased execution-intent surface. Its Surface::tag string "intent" enters the op_id content digest and is therefore frozen forever — changing it would re-address every historical intent op. The enum is deliberately NOT #[non_exhaustive]: the repo bans the _ => wildcards that would force, so a new surface variant is a compile error at every match — the intended review gate. The serde wire form stays a tagged union (#[serde(rename_all = "snake_case")]).

Variants

Routing

Declagent

Conversation

Knowledge

Skill

Registry

Fields

kind: String

Trajectory

Run

Intent

Leased execution-intent ledger (B5): payload {id: run_id, agent_id, epoch, status}. Folds under FoldTier::Leased — LWW-per-run_id with monotone status plus per-agent epoch fencing, so a stale-epoch write from a failed-over lease holder loses deterministically at the fold. See crate::lease.

Implementations

impl Surface

pub fn tag(&self) -> String

Stable string form: the fold’s grouping key and part of the op_id digest.

pub fn fold_tier(&self) -> FoldTier

The proposal’s fold-rule table. Routing observations are grow-only log entries (“sync the observations, not the result”); the EMA replay over them is the caller-injected crate::fold::SyncState::replay.

pub fn is_event_stream(&self) -> bool

Is this surface an event stream — a multiset keyed by op_id rather than a set of content-deduped logical entities?

Two surfaces are event streams, for the same structural reason but with different downstream handling:

• Routing — the proposal’s “replays the merged multiset of observations”: agent x succeeded twice is two events that must both reach the EMA replay.
• Conversation (B2, kernel-review correction) — a conversation turn has exactly one author and propagates by op replication, so op identity IS turn identity. Content-keying was a reproduced data-loss bug: two genuine “yes” turns stamped at the same payload-second (cached now(), rapid double-confirm) fold to one entry. Keyed by op_id, a resent op dedups but two distinct authorings never collapse. Unlike routing, conversation turns are independent entries (no path-dependent replay), so they tolerate LastN retention — see Surface::is_replay_stream.

Event-stream surfaces fold keyed by op_id — see OpRecord::fold_key.

pub fn is_replay_stream(&self) -> bool

Is this surface a path-dependent replay stream — one whose folded result is recomputed from the ordered multiset (routing’s EMA), so that dropping ANY entry corrupts every device’s recomputed value? Only these are retention-forbidden (compact rejects any non-keep-all rule on them). This is narrower than Surface::is_event_stream: conversation is an event-stream multiset too, but its turns are independent, so LastN over them is well-defined and allowed. Routing is the only replay stream today; a new one is a compile-error here (no _ arm), the intended review gate.

Trait Implementations

impl Clone for Surface

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Surface

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Surface

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Surface

impl PartialEq for Surface

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for Surface

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Surface