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/git/.apm/skills/git-submodules/SKILL.md

@@ -9,7 +9,7 @@ description: >
   Not the superproject's own remotes -> `git-remotes`.
 
 metadata:
-  version: "1.0.0"
+  version: "1.0.1"
   category: git
   source_keys:
     - git-scm-submodule-docs

plugins/git/.apm/skills/pc-author/SKILL.md

@@ -6,7 +6,7 @@ description: >
   shellcheck"). Not running, installing, or updating hooks -> `pc-run`.
 allowed-tools: Bash Read Write Edit
 metadata:
-  version: "1.0.0"
+  version: "1.0.1"
   category: devtools
   source_keys:
     - context7-pre-commit-com

plugins/git/.apm/skills/pc-run/SKILL.md

@@ -8,7 +8,7 @@ description: >
 compatibility: Requires pre-commit installed and available on PATH.
 
 metadata:
-  version: "1.0.1"
+  version: "1.0.2"
   category: devtools
   source_keys:
     - context7-pre-commit-com