Address a second fresh-eye review of the review fixes:
- MAJOR: late steering that lands after runTurn returns terminally
stopped (e.g. during the post-turn flush) was drained by runLoop and
dropped without a discard, leaving a dangling outstanding id the
negative-only invariant can't catch. Emit agent/inbox/discard for it,
symmetric with the in-turn terminal-stop drop.
- remove the dead cancel() idle-settle branch: whenIdle's fast path
already resolves for a lone quiet item, so no waiter is ever left for
it to settle. Document why.
- gen-cordis-api classShape now drops private/protected/#private members
and strips getter/setter bodies, so Session no longer leaks private
fields and getter bodies into the model catalog.
- document that AgentMessage intentionally omits meta (durable-only).
Adds a regression test for the late-steering discard.
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