Keep the worker-state backlog honest with current main behavior

ROADMAP ultraworkers#62 was stale. Current main already emits `.claw/worker-state.json`
on worker status transitions and exposes the documented `claw state`
reader surface, so leaving the item open would keep sending future
backlog passes after already-landed work.

Fresh verification on the exact branch confirmed the implementation and
left the workspace green, so this commit closes the item with current
proof instead of duplicating the feature.

Constraint: User required fresh cargo fmt, cargo clippy --workspace --all-targets -- -D warnings, and cargo test --workspace before push
Constraint: OMX team runtime was explicitly requested, but the verification lane stalled before producing any diff
Rejected: Re-implement the worker-state feature from scratch | current main already contains the runtime hook, CLI surface, and regression coverage
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Reopen ultraworkers#62 only with a fresh repro showing missing `.claw/worker-state.json` writes or a broken `claw state` surface on current main
Tested: cargo test -p runtime emit_state_file_writes_worker_status_on_transition -- --nocapture; cargo test -p tools recovery_loop_state_file_reflects_transitions -- --nocapture; cargo test -p rusty-claude-cli removed_login_and_logout_subcommands_error_helpfully -- --nocapture; cargo fmt; cargo clippy --workspace --all-targets -- -D warnings; cargo test --workspace; architect review APPROVE
Not-tested: No dedicated automated end-to-end CLI regression for reading `.claw/worker-state.json` beyond parser coverage and focused smoke validation

Author: Yeachan-Heo

ROADMAP.md

@@ -489,7 +489,7 @@ Model name prefix now wins unconditionally over env-var presence. Regression tes
 
 61. **`OPENAI_BASE_URL` ignored when model name has no recognized prefix** — user report 2026-04-10 in #claw-code (MaxDerVerpeilte, Ollama). User set `OPENAI_BASE_URL=http://127.0.0.1:11434/v1` with model `qwen2.5-coder:7b` but claw asked for Anthropic credentials. `detect_provider_kind()` checks model prefix first, then falls through to env-var presence — but `OPENAI_BASE_URL` was not in the cascade, so unrecognized model names always hit the Anthropic default. **Done at `1ecdb10` 2026-04-10**: `OPENAI_BASE_URL` + `OPENAI_API_KEY` now beats Anthropic env-check. `OPENAI_BASE_URL` alone (no key, e.g. Ollama) is last-resort before Anthropic default. Source: MaxDerVerpeilte in #claw-code; traced by gaebal-gajae.
 
-62. **Worker state file surface not implemented** — dogfooded 2026-04-10. ROADMAP "Deployment Architecture Gap" section documents `.claw/worker-state.json` as the "canonical observability contract" for clawhip, but `emit_state_file()` is not wired in `WorkerRegistry::transition()`. The file is never written. **Status:** documentation exists, code does not. Fix shape: wire `emit_state_file()` to write `.claw/worker-state.json` atomically on every `WorkerStatus` transition; add `claw state` CLI subcommand to read/display it. Blocker: none. Source: Jobdori dogfood.
+62. **Worker state file surface not implemented** — **done (verified 2026-04-12):** current `main` already wires `emit_state_file(worker)` into the worker transition path in `rust/crates/runtime/src/worker_boot.rs`, atomically writes `.claw/worker-state.json`, and exposes the documented reader surface through `claw state` / `claw state --output-format json` in `rust/crates/rusty-claude-cli/src/main.rs`. Fresh proof exists in `runtime` regression `emit_state_file_writes_worker_status_on_transition`, the end-to-end `tools` regression `recovery_loop_state_file_reflects_transitions`, and direct CLI parsing coverage for `state` / `state --output-format json`. Source: Jobdori dogfood.
 
 63. **Droid session completion semantics broken: code arrives after "status: completed"** — dogfooded 2026-04-12. Ultraclaw droid sessions (use-droid via acpx) report `session.status: completed` before file writes are fully flushed/synced to the working tree. Discovered +410 lines of "late-arriving" droid output that appeared after I had already assessed 8 sessions as "no code produced." This creates false-negative assessments and duplicate work. **Fix shape:** (a) droid agent should only report completion after explicit file-write confirmation (fsync or existence check); (b) or, claw-code should expose a `pending_writes` status that indicates "agent responded, disk flush pending"; (c) lane orchestrators should poll for file changes for N seconds after completion before final assessment. **Blocker:** none. Source: Jobdori ultraclaw dogfood 2026-04-12.