WorkerStatus is fully tracked in worker_boot.rs but was invisible to
external observers (clawhip, orchestrators) because opencode serve's
HTTP server is upstream and not ours to extend.
Solution: atomic file-based observability.
- emit_state_file() writes .claw/worker-state.json on every push_event()
call (tmp write + rename for atomicity)
- Snapshot includes: worker_id, status, is_ready, trust_gate_cleared,
prompt_in_flight, last_event, updated_at
- Add 'claw state' CLI subcommand to read and print the file
- Add regression test: emit_state_file_writes_worker_status_on_transition
verifies spawning→ready_for_prompt transition is reflected on disk
This closes the /state dogfood gap without requiring any upstream
opencode changes. Clawhip can now distinguish a truly stalled worker
(status: trust_required or running with no recent updated_at) from a
quiet-but-progressing one.
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