feat(settings-audit): Add Claude Code settings optimizer skill

- Add new 00-claude-code-setting skill for token usage optimization
- Includes audit scripts for MCP servers, CLAUDE.md, and extensions
- Auto-fix capability with backup for serverInstructions and frontmatter
- Add YAML frontmatter to 17 command files
- Target: keep baseline under 30% of 200K context limit

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

custom-skills/00-claude-code-setting/README.md

@@ -0,0 +1,79 @@
+# Claude Code Settings Optimizer
+
+Self-audit and optimize Claude Code configuration for maximum token efficiency.
+
+## Purpose
+
+- Analyze token usage across MCP servers, CLAUDE.md, and extensions
+- Identify optimization opportunities
+- Auto-fix common issues with backup safety
+- Keep working context at 70%+ of 200K limit
+
+## Quick Start
+
+```bash
+# Install
+cd custom-skills/00-claude-code-setting/code
+chmod +x install.sh
+./install.sh
+
+# Run audit
+python3 scripts/run_audit.py
+
+# Apply fixes
+python3 scripts/auto_fix.py --apply
+```
+
+## What Gets Analyzed
+
+| Component | Checks |
+|-----------|--------|
+| **MCP Servers** | serverInstructions presence, token estimates, load strategy |
+| **CLAUDE.md** | Line count, token estimate, structure quality |
+| **Commands** | Frontmatter, description, size limits |
+| **Skills** | SKILL.md presence, size limits |
+| **Agents** | Tool restrictions |
+
+## Target Metrics
+
+| Metric | Target | Max |
+|--------|--------|-----|
+| CLAUDE.md tokens | 2,000 | 3,000 |
+| MCP tokens (with Tool Search) | 5,000 | 10,000 |
+| Baseline total | <30% | <40% |
+| Available for work | >70% | — |
+
+## Files
+
+```
+00-claude-code-setting/
+├── README.md
+└── code/
+    ├── CLAUDE.md              # Skill directive
+    ├── install.sh             # Installation script
+    ├── commands/
+    │   └── settings-audit.md  # /settings-audit command
+    ├── scripts/
+    │   ├── run_audit.py       # Main orchestrator
+    │   ├── analyze_tokens.py  # Token analysis
+    │   ├── analyze_extensions.py
+    │   └── auto_fix.py        # Auto-fix with backup
+    └── references/
+        └── token-optimization.md
+```
+
+## Auto-Fix Capabilities
+
+**Safe (automatic with backup):**
+- Add serverInstructions to MCP servers
+- Add frontmatter to commands
+
+**Manual review required:**
+- Disabling MCP servers
+- Restructuring CLAUDE.md
+- Removing extensions
+
+## Requirements
+
+- Python 3.8+
+- PyYAML (optional, for better frontmatter parsing)