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fix pre-step lifecycle regressions

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_Kerman
2026-07-31 19:40:59 +08:00
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docs/architecture.md
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@@ -121,7 +121,7 @@ Each step assembles ordered prompt sections, tool schemas, and variables; unknow
`agent/pre-step` receives the exclusive batch already removed from the inbox and finalizes whether the loop enters the proposed step. Its `PreStepContext` carries the exact upcoming turn and step plus the cancellation signal. `{ kind: 'reject' }` opens no step; `{ kind: 'enter', messages }` supplies the complete batch appended after `step/start`. A tool continuation with no newly claimed inbox input submits an empty batch so listeners can still contribute current-step context. Waterfall rewrites settle only in the final returned `messages` value.
Pruning precedes summaries; overflow retries require durable progress. `agent/request-error` may authorize one retry turn between failed-step and turn close; cancellation wins. Adapter-owned `retryPolicy` makes normal mode bounded; always mode delegates specialized recovery before retrying until success or cancellation ([compaction](../.agents/notes/implemented/architecture/2026-07-10-after-call-compaction-pressure-and-overflow-recovery.md), [retry foundation](../.agents/notes/implemented/architecture/2026-06-21-bounded-llm-request-recovery.md), [provider policy](../.agents/notes/implemented/feature/2026-07-24-provider-retry-policies.md)).
Pruning precedes summaries; overflow retries require durable progress. `agent/request-error` may authorize a same-step retry before the step closes; cancellation wins, and the retry reuses that step's frozen prompt assembly. Adapter-owned `retryPolicy` makes normal mode bounded; always mode delegates specialized recovery before retrying until success or cancellation ([compaction](../.agents/notes/implemented/architecture/2026-07-10-after-call-compaction-pressure-and-overflow-recovery.md), [retry foundation](../.agents/notes/implemented/architecture/2026-06-21-bounded-llm-request-recovery.md), [provider policy](../.agents/notes/implemented/feature/2026-07-24-provider-retry-policies.md)).
### Failure Boundaries