feat: Add installation tool, Claude.ai export, and skill standardization (#1)

## Summary

- Add portable installation tool (`install.sh`) for cross-machine setup
- Add Claude.ai export files with proper YAML frontmatter
- Add multi-agent-guide v2.0 with consolidated framework template
- Rename `00-claude-code-setting` → `00-our-settings-audit` (avoid reserved word)
- Add YAML frontmatter to 25+ SKILL.md files for Claude Desktop compatibility

## Commits Included

- `93f604a` feat: Add portable installation tool for cross-machine setup
- `9b84104` feat: Add Claude.ai export for portable skill installation
- `f7ab973` fix: Add YAML frontmatter to Claude.ai export files
- `3fed49a` feat(multi-agent-guide): Add v2.0 with consolidated framework
- `3be26ef` refactor: Rename settings-audit skill and add YAML frontmatter

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

custom-skills/_ourdigital-shared/claude-ai-export/INSTALL-CLAUDE-AI.md

@@ -0,0 +1,53 @@
+# Installing OurDigital Skills in Claude.ai
+
+## Option 1: Upload Bundle (Recommended)
+
+1. Go to [claude.ai](https://claude.ai)
+2. Create a new **Project** (e.g., "OurDigital Workspace")
+3. Click **Project Knowledge** → **Add Content**
+4. Upload `ourdigital-skills-bundle.md`
+5. Done! Use "our" or "ourdigital" prefix to trigger skills
+
+## Option 2: Add as Custom Instructions
+
+1. Go to Claude.ai → **Settings** → **Custom Instructions**
+2. Copy the content from `ourdigital-skills-bundle.md`
+3. Paste into Custom Instructions
+4. Save
+
+## Option 3: Individual Skills
+
+Upload only the skills you need from the `individual/` folder:
+- `01-brand-guide.md`
+- `02-blog.md`
+- `03-journal.md`
+- etc.
+
+## Testing After Install
+
+Try these prompts:
+```
+our brand guide
+our blog "AI 마케팅의 미래"
+our research SEO trends 2026
+our 견적서 GTM 구축
+```
+
+## Files in This Export
+
+```
+claude-ai-export/
+├── INSTALL-CLAUDE-AI.md      # This file
+├── ourdigital-skills-bundle.md  # All 10 skills combined
+└── individual/               # Individual skill files
+    ├── 01-brand-guide.md
+    ├── 02-blog.md
+    └── ...
+```
+
+## Updating Skills
+
+When skills are updated:
+1. Pull latest from GitHub
+2. Re-upload the bundle file
+3. Or regenerate with: `python scripts/export_for_claude_ai.py`