Merge commit '5a0d28e200d89dca2b8004d9cd624629a1409a3f' into codex/bounded-background-tasks-v2
# Conflicts: # .agents/notes/implemented/architecture/2026-06-20-generic-long-running-tool-runtime.i18n.yaml # .agents/notes/implemented/architecture/2026-06-20-generic-long-running-tool-runtime.md # .agents/notes/implemented/architecture/2026-06-20-generic-long-running-tool-runtime.zh.md
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@@ -16,7 +16,7 @@ Tasks belong to their owner and backend, not the producer tool fiber, so produce
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Service disposal closes listeners, cancels all live tasks, awaits their records, and detaches effects from surviving owner scopes. If teardown cancellation throws, the service force-fails the record and warns that work may be orphaned instead of deadlocking. A cancellation that returns but never settles `done` remains indistinguishable from a slow stop and can stall teardown.
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Settlement is first-wins: the earliest terminal outcome — producer settlement, a rejected `done` contained as `failed`, or a teardown force-failure — records once, notifies listeners once with per-listener containment, and releases waiters. Pending waits mark the task reported before listeners run so completion reporters do not duplicate notices.
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Settlement is first-wins: the earliest terminal outcome — producer settlement, a rejected `done` contained as `failed`, or a teardown force-failure — records once, releases waiters, and notifies listeners once with per-listener containment. Pending waits mark the task reported before listeners run so completion reporters do not duplicate notices, and a teardown cancel marks it for the same reason: nothing will read a notice addressed to an owner being destroyed. Completion is the last thing a settlement announces, after the record is committed and the visible-set change is published, because a reporter may open a model turn synchronously and every other observer must already have seen the settled record.
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Controllers and listeners are layered by the scope that registered them, in the tools-registry shape: a registration files into its registering context's scope, and a read unions the global layer with the owner's scope chain. One process-wide registry therefore answers per-owner questions per owner — `start()` refuses `background tasks unavailable: no task controller serves this agent (load @deepseek-ai/dsh-tool-tasks in its composition)` for an owner whose own composition attaches none, however many other compositions attach theirs, and a settlement reaches only the listeners its owner's composition registered.
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