Live profiling of the built app (debugger pause inside the hot sqlite
call) showed AgentAwarenessRelay.publishThread grinding at ~8 full shell
snapshots per second after boot. Two causes:

- streamDomainEvents was eventSink.stream() with no cursor, which
  replays every stored event from genesis before going live — so each
  boot fed the relay the entire event history as fresh activity, and it
  queued a publish per activity-relevant event for hours. It now tails
  from the current high-water mark; the relay's startup snapshot publish
  already covers initial state, and the sink subscribes before reading
  the cursor so no live event is lost.
- publishThreadUnsafe materialized the full shell snapshot to find one
  thread; it now uses getThreadShell (archived/deleted map to the
  tombstone path exactly as the active-list lookup did).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>