feat(gates): enforce metadata.version bumps on changed skills at pre-push

check-skill-version-bump fails a push when a skill directory changed
against its merge-base with main (tests/ excluded) without a strictly
higher metadata.version than main. New, renamed and deleted skills are
exempt; every plugin is covered. Recorded as a dated section in
ADR-0022 and documented in gates.md.

Patch-bumps the 17 skills that changed on this branch without a bump,
so the branch passes its own gate. Simplification audit finding 33.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

plugins/bin/.apm/skills/research/SKILL.md

@@ -6,7 +6,7 @@ description: >-
   documentation written from existing code or specs -> `write-docs`. Not a bug
   or incident -> `diagnose`.
 metadata:
-  version: "1.0.0"
+  version: "1.0.1"
   category: research
 allowed-tools:
   - Grep