feat(plugin): command metadata, scoped skills, local-tier support, layered hooks, Stop audit

Wave 3 - adoption hardening. Patterns adapted (in original prose, with
attribution) from MIT-licensed shanraisshan/claude-code-best-practice.

Commands (command/enhance-claude-md.md, command/sync-claude-md.md):
- Add allowed-tools / disallowedTools / argument-hint / when_to_use so the
  commands auto-suggest in the slash menu and avoid permission prompts.
- disallowedTools blocks WebFetch + WebSearch on both commands.
- Drop the previous broken hooks block (array-of-{matcher, commands} shape
  did not match canonical schema; was never firing).

Skills:
- skill/karpathy-guidelines/SKILL.md: paths: glob over 23 code-file
  extensions, so the guardrails auto-load only when editing source, not
  markdown or data.
- skill/SKILL.md: model: haiku, effort: medium, paths: scoped to CLAUDE.md
  + AGENTS.md + .claude/rules/*.md so validator/generator passes run
  cheaply without changing the user-facing model.

CLAUDE.local.md personal tier:
- skill/validator.py BestPracticesValidator now accepts filename=; any
  *.local.md basename waives the 150-line cap.
- hooks/validate-claude-md.py reads the exempt suffix from hooks-config.
- .gitignore covers CLAUDE.local.md, **/CLAUDE.local.md,
  .claude/settings.local.json, hooks/hooks-config.local.json.

Layered hook config:
- hooks/hooks-config.json: committed defaults
  (validateClaudeMd.enabled/maxLines/exemptFilenameSuffix/exitCodeOnViolation,
  stopAuditLine.enabled).
- hooks/validate-claude-md.py merges hooks-config.json +
  hooks-config.local.json key-by-key; honours enabled=false (silent
  exit 0), configurable cap, configurable exit code.

Stop audit hook:
- hooks/audit-claude-md.py walks the project tree, prints one stderr
  line: total tracked / OVER cap / near cap (>=80%). Respects
  stopAuditLine.enabled from config.
- hooks/hooks.json registers Stop event with matcher "".

Guardian fail-closed contract:
- agent/claude-md-guardian.md Safety & Validation section now explicitly
  requires Skill-tool invocation (no inline paraphrase of SKILL.md),
  abort on missing validated output, never auto-commit, and respect
  local hook config.

Verified (8/8 smoke tests):
- Both commands parse with new fields and no broken hooks block.
- karpathy paths: 23 globs, includes .py/.ts/.go/.rs.
- skill model=haiku effort=medium with CLAUDE.md path scope.
- Validator: *.local.md (300 lines) -> pass; CLAUDE.md (300) -> fail;
  legacy ctor without filename -> default behavior preserved.
- hooks-config.json valid; validateClaudeMd.enabled=true, maxLines=150.
- Hook validator: default rc=2 on bloated, rc=0 when local override
  disables it, rc=0 on *.local.md (exempt).
- Stop hook entry present; audit script: rc=0 with "5 CLAUDE.md tracked".
- Regression: large-fullstack root still 52 lines with chain imports.

skill/SKILL.md

@@ -1,6 +1,25 @@
 ---
 name: claude-md-enhancer
 description: Analyzes, generates, and enhances CLAUDE.md files for any project type using best practices, modular architecture support, and tech stack customization. Use when setting up new projects, improving existing CLAUDE.md files, or establishing AI-assisted development standards.
+model: haiku
+effort: medium
+paths:
+  - "**/CLAUDE.md"
+  - "**/CLAUDE.local.md"
+  - "**/AGENTS.md"
+  - "**/.cursorrules"
+  - "**/.windsurfrules"
+  - "**/.claude/rules/*.md"
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Glob
+  - Grep
+  - "Bash(ls:*)"
+  - "Bash(find:*)"
+  - "Bash(git:*)"
+  - "Bash(wc:*)"
 permissions:
   allow:
     - Read
@@ -8,9 +27,9 @@ permissions:
     - Edit
     - Glob
     - Grep
-    - Bash(ls:*)
-    - Bash(find:*)
-    - Bash(git:*)
+    - "Bash(ls:*)"
+    - "Bash(find:*)"
+    - "Bash(git:*)"
 ---
 
 # CLAUDE.md File Enhancer