Wire the Phase 3 ratchet into CI by passing the PR base SHA to
eval-coverage.py --modified-from. Expand changed-skill detection from
SKILL.md-only diffs to the entire skill directory so that references,
scripts, fixtures, README, and eval manifest edits all count as
modifications. Add a monotonic coverage floor that fails CI when
coverage decreases between the base and candidate revisions.
Add script tests for ratchet-mode detection and coverage-decrease
behaviour. Update AGENTS.md and CONTRIBUTING.md to describe the
behaviour CI now enforces.
Closes#102
Signed-off-by: Magnus Hedemark <magnus919@pm.me>
Phase 1: New skills (not in grandfathered-skills.txt) must have
evals/evals.json with at least 5 test cases. All 107 existing skills
are grandfathered.
Phase 2: scripts/eval-coverage.py reports coverage (skills with/without
evals, case counts, reference-priority sorting). Added as informational
CI step.
Phase 3: Ratchet thresholds — at 25% coverage, modified skills without
evals get a warning; at 50%, they fail CI. Enforced via
--modified-from flag for PR-scoped checks.
Closes#90
