v3.13.0

• guardvibe ci github --pr generates a PR review workflow: on each pull request it runs a diff-aware scan (only newly-introduced issues) and posts them as inline review comments on the exact file + line
• Uses actions/github-script (no extra runtime dependency) with a graceful fallback; pinned + auto-upgraded
• Completes Season 3; no rule or tool changes (441 / 37); gate green (PASS/A/0)