Fix skill repo review findings

[songxuchen]

What changed

• Parse skill frontmatter with PyYAML in tests/validate.py and install PyYAML in CI.
• Update README single-skill install command to use --skill.
• Update eval docs to reflect Claude Code 2.1.232 behavior: plugin eval is documented but still early-access gated at runtime.
• Clarify auto-dubbing CLI timeout guidance for normal terminals vs agent host shells.

Validation

• python3 tests/validate.py
• YAML parse of workflow, eval cases, and every */SKILL.md frontmatter
• claude plugin validate --strict .claude-plugin/plugin.json
• claude plugin validate --strict .claude-plugin/marketplace.json
• Markdown local-link check
• git diff --check

Note: a smoke run of claude plugin eval . --case routing-video-scoring --runs 1 --no-publish ... still exits with plugin eval is currently in early access, which is now documented.

[sapient-app]

Lightsage docs evals

Waiting for the staging docs URL before running evals.

Lightsage will start the selected PR evals automatically when GitHub reports a successful docs deployment for this PR. This usually happens within 15 minutes.

Commit: efa40df
Status: waiting for staging docs URL