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refactor: apply repository naming contract

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Apply the accepted pre-release package, service, type, directory, and role renames as one repository-wide change.
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Tianyi Cui
2026-08-13 00:36:22 +08:00
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.agents/notes/implemented/testing/2026-06-22-fork-child-replay-seed-boundary.md
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@@ -8,9 +8,9 @@ English | [中文](2026-06-22-fork-child-replay-seed-boundary.zh.md)
The [per-session snapshot replay Agent Note](2026-06-22-subagent-snapshot-replay.md) made the snapshot tier express a nested-agent shape: a parent plus one recorded log per in-process subagent, each replayed as its own script keyed by calling session. It noted (§ Scope, final bullet) that a fork snapshot was "a trivial future addition, not a gap in the keying." That was wrong about a fork child specifically — not the keying, but the *script derivation*.
A subagent script is derived from a recorded session log by [`deriveReplayScript`](../../../../packages/support/llm-replay): it groups the log's `assistant/chunk` events by `(turn, step)` into one replay entry per `stream()` call. This is correct for a **spawn** child, whose log contains only its own model calls.
A subagent script is derived from a recorded session log by [`deriveReplayScript`](../../../../packages/test-support/llm-replay): it groups the log's `assistant/chunk` events by `(turn, step)` into one replay entry per `stream()` call. This is correct for a **spawn** child, whose log contains only its own model calls.
A **fork** child is different. The fork backend seeds the child session with a *balanced completed-turn prefix of the parent's log* ([`dsh-subagent-inprocess`](../../../../packages/subagent/subagent-inprocess)), and that seed becomes the child session's persisted `log` (`Session`'s constructor copies the seed into `this.log`). So a fork child's `.jsonl` begins with the **parent's** events — including the parent's `assistant/chunk` events — and only then carries the child's own turn.
A **fork** child is different. The fork backend seeds the child session with a *balanced completed-turn prefix of the parent's log* ([`dsh-subagent-in-process-driver`](../../../../packages/subagent/subagent-in-process-driver)), and that seed becomes the child session's persisted `log` (`Session`'s constructor copies the seed into `this.log`). So a fork child's `.jsonl` begins with the **parent's** events — including the parent's `assistant/chunk` events — and only then carries the child's own turn.
Deriving the child script from the whole fork-child log therefore replays the **parent's** recorded responses as the **child's** model calls: the live fork child's first `stream()` would receive the parent's first recorded chunk sequence instead of its own. The recorded scenarios are all spawn today, so this never fired — but a fork snapshot would have mis-routed silently, exactly the class of bug the snapshot tier exists to catch.