feat(skill): cad-babysit — human-in-the-loop session over cad-stuck (skills#31)

Wraps mathias/cad#14's `cad stuck` query surface: five-phase diagnostic
order (re-derive the worklist, read issue comments FIRST, then Actions job
logs, separate infrastructure fault from task outcome, decide-or-say
DECISION-NEEDED), read-only by Iron Law — no dispatch, no label writes, no
issue close. Every diagnosis cites a locator; every operator-only call
surfaces as a structured DECISION NEEDED block instead of being decided for
them.

Built after cad#14 passed its live-estate acceptance test (7 real findings,
locators verified) — the skill is the ritual around a query already proven
to produce actionable rows, not a checklist with no input.

Bump-Type: minor

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

SKILLS_INDEX.md

@@ -30,6 +30,7 @@ This index lists all available engineering skills. Load the full SKILL.md on dem
 | `discovery-framing` | Problem-before-solution discovery/framing method | Framing/validating a problem before any solution; opportunity sizing |
 | `stage-gate-review` | Stage-gate product governance (go/no-go council) | Preparing a Product Council ask; building a go/no-go checklist; gate review |
 | `web-shot` | Screenshot a running web UI via a koala k3s Playwright job | Visual verification of a running UI when no local browser exists |
+| `cad-babysit` | Focused human-in-the-loop session working CAD's stuck queue (read-only) | Picking up whatever `cad stuck` flags, with a human present |
 | `superpowers-brainstorming` | Structured divergent brainstorming | Generating or expanding a set of ideas |
 | `superpowers-writing-plans` | Writing implementation plans | Planning substantial work before coding |
 | `superpowers-executing-plans` | Executing a written plan step by step | Running an approved plan to completion |