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agent-loop lifecycle: dispose drains machine.done to true quiescence. cancel()'s own running-to-idle transition can legitimately re-enter through an automation listener (goal-session's idle drive runs synchronously to its first await) and replace done with a fresh admission after the single capture; teardown now re-cancels and re-awaits until the slot stabilizes, so the scope never unwinds under a live run. tools: a nested concludeTurn() stages on its own execution and promotes to the enclosing composite only on the call's authoritative successful verdict. A post-execute policy that converts the nested success into an error no longer lets a recovering composite stop the turn on a failed terminal operation (the Code Mode structured-output shape). goal-session: the driver owns its round durability barrier again. The loop's persistence is eager write-behind with no turn-end flush, so the old post-turn agent/error signal for flush failures never fires; a settled round now sets needsCheckpoint and re-enters drive, flushing before the next reservation and disarming on failure instead of queueing an autonomous round on state that was never persisted.