Staging re-test (2026-07-31, post-74482 image roll): auto-created
threads still stuck on their initial titles; connector telemetry shows
zero thread_rename ops. Root cause is an ordering flaw in the 74482
consume path: BOTH the title-callback registration gate and the
schedule gate read the send-result feedback cache
(_relay_auto_thread_info) — but registration runs BEFORE delivery on
the non-streaming lane, and the auto-title thread races delivery even
when registration survives. The cache read can only succeed AFTER the
connector answers the send, so the rename lane deterministically
disqualified itself on the title turn.
Fix — decide shape early, facts late:
- New _is_relay_discord_channel_lane: SHAPE-only predicate (relay
Discord channel event, no thread) used by the registration and
schedule gates; no cache read before delivery.
- _rename_discord_auto_thread_for_session_title: on the relay lane,
poll the adapter's feedback cache (0.5s ticks, ≤10s) — delivery is
typically right behind the title. True miss (connector didn't
auto-thread: policy off, DM, send failed) no-ops exactly as before.
Tests: shape-gate matrix; late-arriving feedback -> rename fires with
only_if_current_name guard; never-arriving feedback -> no-op. Relay
suite 174 passed.
4a8eeb5d1c