Audit Write Path (CLI/API)

[SorraTheOrc]

Expose --audit "..." on update/create APIs to write the audit entry.

Acceptance Criteria

• wl update <id> --audit "Ready to close: Yes\n<freeform>" writes {time,author,text,status}.
• CLI validates first-line readiness and rejects missing/ambiguous first line.
• Feature-gated via config.

Minimal implementation

• Extend CLI/API handlers to accept --audit.
• Implement parse & validation and wire feature flag.
• Integration tests (CLI + JSON export).