Fork-based PRs (like PR #498) caused all CI checks to fail due to:
- ci-quality-gate: checkout failed because fork branch names don't exist
in the base repo. Now uses commit SHA for PR events.
- skill-security-audit: comment posting failed with read-only GITHUB_TOKEN.
Now continues on error and writes results to job summary as fallback.
- claude-code-review: fallback comment step failed silently. Now continues
on error and writes status to job summary.
https://claude.ai/code/session_01X1RKFAkEwxgg6gQvJG1KCa
Integrates skill-security-auditor as automated CI check per #241:
- Detects which skill directories changed in the PR (diff-based)
- Runs skill_security_auditor.py --strict --json on each changed skill
- Posts findings as a formatted PR comment with severity breakdown
- Blocks merge on FAIL verdict (critical findings)
- Skips non-skill paths (.github, docs, scripts, etc.)
- Updates existing comment on re-push (no comment spam)
- Concurrency grouping prevents parallel runs on same PR