Introduce Measure-SkillCoverage.ps1 under eng/skill-coverage/ that
measures how much of a SKILL.md's teaching content is verified by
eval.yaml test scenarios — analogous to code coverage for skill files.
The script extracts testable 'coverage points' from four structural
sections of a skill file (Validation checklist, Common Pitfalls,
Workflow Steps, and code patterns from fenced blocks), then
cross-references them against eval.yaml assertions and rubric
criteria using regex matching and keyword overlap heuristics.
Features:
- Per-skill and aggregate (-All) analysis across all plugins
- Table output with colored pass/fail and per-category percentages
- JSON output for machine consumption (single object or array)
- Distinguishes deterministic assertions from rubric-only coverage
- MinCoverage threshold for CI gating
- Tracks source line numbers for all coverage point categories
Amaury Levé