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/00-our-settings-audit/desktop/skill.yaml

@@ -0,0 +1,39 @@
+# OurDigital Settings Audit
+# Comprehensive error diagnosis and context optimization
+
+name: our-settings-audit
+
+description: |
+  Diagnose all Claude Desktop errors and optimize context usage.
+  Covers 8 error categories: context limits, output interruption,
+  length/file errors, usage limits, server capacity, MCP connection,
+  account issues, and output quality problems.
+
+allowed-tools:
+  - Read
+  - Glob
+  - Grep
+
+license: Internal-use Only
+
+triggers:
+  - settings audit
+  - settings check
+  - audit settings
+  - exceed response limit
+  - response could not be generated
+  - length limit
+  - file too large
+  - conversation limit
+  - 5-hour limit
+  - messages left
+  - rate limit
+  - capacity constraints
+  - server error
+  - MCP error
+  - server connection failed
+  - account disabled
+  - login error
+  - output cutoff
+  - token error
+  - gibberish output