feat(skill-writer): skill-writer ask subcommand

[pixelastic]

Parent

#28

What to build

Add the ask subcommand to the skill-writer script.

skill-writer ask --scope <id> "<prompt>" must:

• Run claude --dangerously-skip-permissions --continue --print --output-format stream-json "<prompt>" inside ~/local/tmp/claude/skill-writer/<scope>/worktree/
• Append claude's stdout to ~/local/tmp/claude/skill-writer/<scope>/history.jsonl
• No output on stdout

--continue resumes the most recent claude session in the worktree directory, which is always the session from the last skill-writer test run in that scope.

Acceptance criteria

• skill-writer ask --scope foo "why didn't you follow the skill?" runs claude with --continue in the worktree
• Output is appended to history.jsonl (not overwritten)
• history.jsonl contains both the test session and the ask session in order
• Script produces no stdout
• Missing scope directory produces a clear error on stderr and exits non-zero

Blocked by

• feat(skill-writer): skill-writer test core #29