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>

CLAUDE.md

@@ -14,11 +14,11 @@ This is a Claude Skills collection repository containing:
 
 ## Custom Skills Summary
 
-### Claude Code Settings (00)
+### Claude Settings Audit (00)
 
 | # | Skill | Purpose | Trigger |
 |---|-------|---------|---------|
-| 00 | claude-code-setting | Settings optimization & token audit | "audit settings", "optimize Claude Code" |
+| 00 | our-settings-audit | Error diagnosis & token optimization (8 categories) | "settings audit", "exceed response limit", "MCP error" |
 
 ### OurDigital Core Workflows (01-09)
 
@@ -170,7 +170,7 @@ triggers: []              # Explicit trigger keywords
 ```
 our-claude-skills/
 ├── custom-skills/
-│   ├── 00-claude-code-setting/
+│   ├── 00-our-settings-audit/
 │   │
 │   ├── 01-ourdigital-research/
 │   ├── 02-ourdigital-designer/