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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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2
examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
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examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl
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@@ -1,6 +1,6 @@
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examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl
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examples/headless-agent/tests/semantic-checkpoint-snapshots/tool-outcome-unknown/session.expected.jsonl
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47
examples/headless-agent/tests/subagent-inheritance-snapshots/parent-override/parent.expected.jsonl
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@@ -3,26 +3,27 @@
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