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feat(session): project the inherited-history boundary into the log

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A plugin owning a standalone open/close bracket cannot tell a dead marker
from a live one: an unmatched `compact/start` reads identically whether the
previous writer died mid-compaction or a compaction is running now.
`Session.firstLiveSeq` already holds that answer exactly, but only in memory.

Append the log-only `session/inherited` event at that seq from the seeded
constructor — the single waist all six seeded-start paths pass through
(resume, configured startup on a persisted id, `sessions.fork()`, a subagent
fork child, `adopt()`'s live prefix, and a bare seeded `create`). Read it
through the new `isInheritedSeq(events, seq)`.

The constructor placement means persistence needs no changes: the marker is
already in `events` when a backend captures the creation seed, so it rides
the ordinary seed path with no load-time write. It also covers fork, where
the inherited bracket's owner may still be running — the case a
persistence-layer boundary could not reach.

Activity ordering excludes the boundary through `lastActivityTime()`, since
lazy resume makes browsing a pickup and the three call sites would otherwise
float every opened session to the top of a picker or list.
This commit is contained in:
Hypatia May
2026-07-30 11:38:51 +08:00
parent 2a53806275
commit b341155652
41 changed files with 850 additions and 122 deletions
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29
docs/persistence-catalog.md
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@@ -78,7 +78,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
}[T]
```
Sources: [`packages/core/session/src/types.ts:256`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:263`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:292`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:324`](../packages/core/session/src/types.ts)
Sources: [`packages/core/session/src/types.ts:276`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:283`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:312`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:344`](../packages/core/session/src/types.ts)
## Events
@@ -404,6 +404,33 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:33`](../packages/s
### `session/*`
#### `session/inherited` — log-only
```ts persistence-catalog
/**
* The log-only durable projection of {@link Session.firstLiveSeq}: everything
* BELOW it was inherited through a constructor seed — resume, fork, or replay
* — and no writer in this session's lifecycle produced it. Appended as the
* first live event of every seeded session.
*
* A plugin owning a standalone open/close bracket (`compact/start` …
* `compact/end`) needs it because inherited history and live work are
* otherwise byte-identical: an unmatched opening marker below this boundary
* belongs to an ended lifecycle, so it is dead whether the writer crashed,
* the process succeeded it, or the events were forked out of a parent that is
* still running. Read it through `isInheritedSeq`.
*
* NOT a liveness signal about other writers: a concurrently live session may
* hold an open bracket over the same stored history with its own boundary
* elsewhere, so tolerating concurrent writers needs a signal beyond the log.
*
* The payload is empty by design — position and `time` carry the meaning.
*/
'session/inherited': Record<string, never>
```
Source: [`packages/core/session/src/types.ts:272`](../packages/core/session/src/types.ts)
#### `session/title` — log-only
```ts persistence-catalog