cleanup

# cleanup Invoke the babysitter:babysit skill (using the Skill tool) and follow its instructions (SKILL.md). Create and run a cleanup process using the process at `skills\babysit\process\cradle\cleanup-runs.js/processes/cleanup-runs.js`. Implementation notes (for the process): - Parse arguments for `--dry-run` flag (if present, set dryRun: true in inputs) and `--keep-days N` (default: 7) - The process scans .a5c/runs/ for completed/failed runs, aggregates insights, writes summaries, then removes old data - Always show the user what will be removed before removing (in interactive mode via breakpoints) - In non-interactive mode (yolo), proceed with cleanup using defaults - The insights file goes to docs/run-history-insights.md - Only remove terminal runs (completed/failed) older than the keep-days threshold - Never remove active/in-progress runs - Remove orphaned process files not referenced by remaining runs - After cleanup, show remaining run count and disk usage