Address a fresh-eye review of the disposal/injection fixes:
- disposal now snapshots, clears, and marks disposed BEFORE emitting
agent/inbox/discard (mirroring cancel's snapshot→clear→emit), so a
re-entrant send/cancel from a discard listener throws 'disposed' or
finds an empty inbox instead of leaking or double-discarding an id.
The discard is unconditional (even on unpublished setup-rollback) to
match send's unconditional enqueue, keeping every id balanced.
- restore the turnRecorded guard on the idle-injection flush: a
turn/start rejected pre-commit (append reentrancy / internal-dispatch
veto) records nothing and owes no flush; the previous unconditional
flush emitted a phantom-turn agent/error. The isTurnOpen/turnRecorded
branches are reachable (reentrant inject from a session/event
listener) and now covered by a regression test rather than v8-ignored.
- rewrite the agent/inbox/discard event JSDoc to enumerate all three
emitters (cancel, terminal turn-stop, disposal) — every enqueued id
gets exactly one terminal dequeue-or-discard.
Per-file coverage stays 100%.
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