Previously `claw state` errored with "no worker state file found ... — run a
worker first" but there is no `claw worker` subcommand, so claws had no
discoverable path from the error to a fix.
Changes:
- Rewrite the missing-state error to name the two concrete commands that
produce .claw/worker-state.json:
* `claw` (interactive REPL, writes state on first turn)
* `claw prompt <text>` (one non-interactive turn)
Also tell the user what to rerun: `claw state [--output-format json]`.
- Expand the State --help topic with "Produces state", "Observes state",
and "Exit codes" lines so the worker-state contract is discoverable
before the user hits the error.
- Add regression test state_error_surfaces_actionable_worker_commands_139
asserting the error contains `claw prompt`, REPL mention, and the
rerun path, plus that the help topic documents the producer contract.
Verified live:
$ claw state
error: no worker state file found at .claw/worker-state.json
Hint: worker state is written by the interactive REPL or a non-interactive prompt.
Run: claw # start the REPL (writes state on first turn)
Or: claw prompt <text> # run one non-interactive turn
Then rerun: claw state [--output-format json]
JSON mode preserves the full hint inside the error envelope so CI/claws
can match on `claw prompt` without losing the canonical prefix.
Full workspace test green except pre-existing resume_latest flake (unrelated).
Closes ROADMAP #139.
541c5bb95d