skill-frontmatter was a 62-line bash script inlined in .pre-commit-config.yaml, re-parsing SKILL.md frontmatter with grep and awk to check for name/description/metadata.version fields. skill-size-check.sh already parses the same frontmatter block with PyYAML for its ADR-0020 checks, so the two checks belonged in one script. Adds a ~20-line required-frontmatter check (name, description, metadata.version as three-part semver) to scripts/skill-size-check.sh. Removes the inline skill-frontmatter hook from .pre-commit-config.yaml and deletes tests/test-skill-frontmatter.sh (366 lines). Removes the 79-line "the other hook on that scope" discussion from docs/spec/gates.md and its now-dangling cross-reference, replacing both with a one-line note of the fold, and updates the pre-push hook counts there. Updates fixture builders in test-skill-size-check.sh, test-adr0020-body-checks.sh, test-adr0020-targets.sh, test-adr0020-differential.sh, and test-vale-hooks-consumer.sh to carry valid metadata.version so the new check doesn't spuriously fail existing fixtures that predate it. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YR2CjVumUbEGWcMikcoXBD
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