Cancel Ralph

Cancel the active Ralph Wiggum loop.

Action

1. Read prd.json.session if it exists
2. Update status to "terminated"
3. Report current progress to the user

Report Format

Ralph loop cancelled.

Session: {session name}
Iterations completed: {n}/{max}
Tasks completed: {n}/{total}

Progress preserved in:
- prd.json.items (completed tasks still marked)
- prd.json.session (session state)
- progress.txt (session log)

To resume: /ralph

That's it. Just cancel and report.