keep_last: on timeout, re-output the last message (via new store.peek, which
reads the outbox without consuming) instead of blanking - holds the display
steady between messages in Auto Queue.
stop_on_timeout: on timeout, send an 'agent-bridge-stop-autoqueue' event; a new
web/ JS extension toggles ComfyUI's Auto Queue off so the loop halts when the
stream goes quiet (best-effort across frontend versions). Registers WEB_DIRECTORY.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
