Why: the library now defines requirement-level conformance for tool rules
and hooks (draft.8); the composition's existing gate mechanisms should be
honestly graded against A1-A7 rather than implicitly assumed compliant.
Evidence: matrix rows cite the 19/19 scratch suite negatives, the live data/
dirty-tree interception, and PR records; commit-msg python3 dependency
verified fail-closed by reading the hook's test path.
Impact: docs-only; guidelines gitlink advances to c9ab623 (draft.8); no
workflow or code change.
Refs: Development-Guidelines PR#2 (c9ab623); policy/adoption.md
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