Run an end-to-end test for the Meta Skill Installer.

Goal: install a real ClawHub skill for CalDAV calendar capability.
Reference page: https://clawhub.ai/skills/caldav-calendar

Follow this exact workflow:
1. State the missing capability in one sentence.
2. Search ClawHub for CalDAV-related skills and choose the best candidate.
3. Stage-install to a temporary directory first (never install directly to active skills path).
4. Run security review on the staged skill:
   DATA_DIR="${SMC_DATA_DIR:-$HOME/.super-multica}"
   node "$DATA_DIR/skills/meta-skill-installer/scripts/review-skill-security.mjs" "<staged skill path>"
5. If riskLevel is safe, install to "$DATA_DIR/skills".
6. Verify final install by checking "$DATA_DIR/skills/<slug>/SKILL.md" exists.
7. Return a short report: selected slug, riskLevel, final install path.
