Add .github/workflows/verify-skills.yml — installs pyyaml and runs
scripts/verify_skills.py on push and pull_request, failing the build if any skill
would not load. GitHub Actions runs it; Gitea Actions also reads .github/workflows/
when Actions is enabled, so it covers both remotes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
