Add a hist subcommand backed by a daemon posting-history log

[leynos]

Stacked on #149 (which stacks on #148). Merge order: #148, then #149, then this.

What

• The daemon appends one JSON line per posting attempt — successful or failed — to <queue_path>/history.jsonl. Success records are written when an entry completes; a failure record is written for each failed attempt (the entry stays queued and retries after a cooldown). A history write failure never stops the retry loop, and malformed lines are skipped on read so one corrupt record cannot hide the rest.
• New hist protocol operation returning records in chronological order, optionally limited to the most recent N.
• New comenq hist [-n|--limit LIMIT] subcommand rendering identifier, age, ok/FAIL status, repository, a one-line body summary, and the failure description for failed attempts.

Testing

• Store unit tests: empty history, round-trip ordering, malformed-line skipping.
• Protocol round-trip tests for hist and history replies.
• Client tests: CLI parsing (-n/--limit), request/reply round trip, rendering.
• BDD: new history.feature (empty history, ordered success/failure records, limit) and extended worker.feature scenarios asserting the worker records successes and failures through the real posting path.
• Full gates green: fmt, clippy + Whitaker dylint, 188 tests + all cucumber features, markdownlint, nixie.

🤖 Generated with Claude Code

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