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ee4cad3ada
The bridge now holds each session's `AgentHandle` disposer in its `SessionRecord` and runs it on teardown (client disconnect or fiber dispose) instead of the old `abort()` + `whenIdle()` drain that left agents registered. A bare client disconnect now leaves NO registered agent and NO session-store entry — not an idled-but-still-registered one. The queue-aware `cancel()` inside the disposer also closes the former pre-step best-effort window (a turn about to start is dropped), so teardown reaches true quiescence. The `session/load`-races-teardown leak is fixed: if the bridge closed while `resume()` was pending, the just-resumed handle is disposed before throwing, so it leaves no orphan (it has no SessionRecord, so quiesce() never sees it). Tests: the disconnect test now asserts (through the SAME memoized teardown) that the agent is unregistered AND its session removed; a durability test re-loads the persisted log after dispose and asserts the closing turn/end is on disk (guards the teardown-order contract); a sibling-isolation test proves one handle's dispose() leaves other agents untouched. Docs: agent / agent-loop / acp READMEs, architecture.md, and the stale in-code quiesce() ownership comment updated to the per-agent disposal model; the now-resolved TODO(rfc010-agent-disposal) / TODO(rfc010-cancel-prestep) teardown notes removed.