chore(gates): retire the external pre-commit hook contract

Why: .pre-commit-hooks.yaml and its release-tag gate served external
consumers that do not exist. No repo on the Gitea instance pins these
hooks, and the README names apm as the only supported install path. The
mechanism was also already failing: skill-size-check.sh changed after
v2.0.1 with no tag cut, and the gate cannot fire through Gitea's merge
button. (Simplification audit finding 36.)

Implementation Notes:
- Delete .pre-commit-hooks.yaml, scripts/check-release-needed.sh,
  tests/test-check-release-needed.sh and tests/test-vale-hooks-consumer.sh,
  and remove the check-release-needed pre-push hook. The repo: local
  skill-size-check and vale-audit-prefilter-* hooks are unchanged.
- ADR-0014 is amended, not retired: its runtime decision to bundle Vale
  inside factory-audit stands. The amendment keeps the entry[0]-only
  constraint (LESSONS.md:101,105) in case the export returns. ADR-0025
  gets a pointer.
- test-vale-wrap.sh: drop case 33 (the cross-manifest drift check) and
  case 28's hook-scope half, which read the published manifest. Case 32
  now also requires each hook to select every tracked file of its class,
  which keeps case 33's one-plugin-narrowing guard, with a mutation test.
- test-skill-size-check.sh and test-adr0020-contract.sh now assert the
  hook contract and verbose: true on .pre-commit-config.yaml only.
- gates.md: pre-push count goes from 9 to 8 authored hooks (11 to 10
  reported), and the Release table, the External consumers section and
  the two-manifest scope table are removed. README and script/test
  comments no longer describe the export as live. The resolver comment
  is edited identically in both copies.
- The v1.0.0/v2.0.0/v2.0.1 tags are left in place; they are inert.

ADR: 0014
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/test-adr0020-contract.sh

@@ -9,10 +9,10 @@
 #      ADR-0025 merged skill-audit and agent-audit, which dropped the count from
 #      three copies to two: factory-audit now holds ONE copy in a sourced
 #      lib-boundary-resolver.sh, and scripts/skill-size-check.sh keeps its
-#      embedded copy because it is a repo-root hook consumed through
-#      .pre-commit-hooks.yaml, where entry[0] is the only token pre-commit
-#      rewrites — it cannot reach a file inside the plugin at a path any consumer
-#      has. Nothing but this file asserts the two copies are still identical, and
+#      embedded copy because it is a repo-root hook kept fit for a published
+#      hook manifest (retired; ADR-0014), where entry[0] is the only token
+#      pre-commit rewrites — it could not reach a file inside the plugin at a
+#      path any consumer has. Nothing but this file asserts the two copies are still identical, and
 #      a one-line edit to a single copy is invisible: every constant-agreement
 #      assertion in tests/test-skill-size-check.sh still passes, because the
 #      CONSTANTS are not what drifted.
@@ -590,14 +590,14 @@ for probe in "scripts/skill-size-check.sh|$HOOK|$SUBJECT_SKILL_DIR/SKILL.md" \
 done
 
 # ---------------------------------------------------------------------------
-# 3. verbose: true on the skill-size-check hook, in BOTH manifests
+# 3. verbose: true on the skill-size-check hook
 # ---------------------------------------------------------------------------
-# .pre-commit-config.yaml governs this repo; .pre-commit-hooks.yaml is what a
-# CONSUMER repo gets when it points at this one. Dropping the flag from either
-# silences the SUGGESTION tier for that audience alone, which is the hardest
-# version of the defect to notice.
+# pre-commit prints nothing for a passing hook, so dropping the flag silences
+# the SUGGESTION tier without failing anything. The published
+# .pre-commit-hooks.yaml that once carried a second copy of this hook was
+# retired (ADR-0014, 2026-09-16 amendment); if it returns, assert it here too.
 echo ""
-echo "--- the skill-size-check hook declares verbose: true in both manifests ---"
+echo "--- the skill-size-check hook declares verbose: true ---"
 VERBOSE_REPORT="$(python3 - "$REPO_ROOT" <<'PY'
 import os
 import sys
@@ -632,27 +632,6 @@ else:
     emit('FAIL', '.pre-commit-config.yaml: skill-size-check has verbose=%r — '
                  'pre-commit prints nothing for a passing hook, so every '
                  'ADR-0020 SUGGESTION is swallowed' % (found.get('verbose'),))
-
-# Consumer manifest: a flat list of hooks.
-path = os.path.join(root, '.pre-commit-hooks.yaml')
-try:
-    with open(path, encoding='utf-8') as fh:
-        hooks = yaml.safe_load(fh) or []
-except Exception as exc:
-    emit('FAIL', '.pre-commit-hooks.yaml did not parse: %s' % exc)
-    hooks = []
-found = None
-for hook in hooks:
-    if isinstance(hook, dict) and hook.get('id') == 'kyberforge-skill-size-check':
-        found = hook
-if found is None:
-    emit('FAIL', '.pre-commit-hooks.yaml declares no hook with id kyberforge-skill-size-check')
-elif found.get('verbose') is True:
-    emit('PASS', '.pre-commit-hooks.yaml: kyberforge-skill-size-check is verbose: true')
-else:
-    emit('FAIL', '.pre-commit-hooks.yaml: kyberforge-skill-size-check has verbose=%r — '
-                 'a consumer repo would never see the SUGGESTION tier'
-                 % (found.get('verbose'),))
 PY
 )"
 while IFS=$'\t' read -r status msg; do