- Document the {"type":"compact"} forced-compression control message
  (bypasses threshold, no stream_start, rejected if a run is active,
  TUI /compact + Ctrl+X C).
- Fix image limits: 8 images, 50 MB total payload (was 10 / 5 MB each).
- tool_started/tool_call: document metadata + tool_call_id fields.
- recall_update action: add skipped (scheduled|cancelled|skipped|fired|
  rescheduled).
- session_sync: document the session_id/profile_id payload.
- Add missing events: model_info, todo_updated, terminal_output,
  terminal_closed.
- Document close code 4003 (auth/access denied) alongside 4004.

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