refactor: Reorganize skill numbering and update documentation

Skill Numbering Changes:
- 01-03: OurDigital core (was 30-32)
- 31-32: Notion tools (was 01-02)
- 99_archive: Renamed from _archive for sorting

New Files:
- AGENTS.md: Claude Code agent routing guide
- requirements.txt for 00-claude-code-setting, 32-notion-writer, 43-jamie-youtube-manager

Documentation Updates:
- CLAUDE.md: Updated skill inventory (23 skills)
- AUDIT_REPORT.md: Current completion status (91%)
- Archived REFACTORING_PLAN.md (most tasks complete)

Removed:
- ga-agent-skills/ (moved to separate repo ~/Project/dintel-ga4-agent)

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

custom-skills/43-jamie-youtube-manager/code/scripts/requirements.txt

@@ -0,0 +1,7 @@
+# Jamie YouTube Manager
+# YouTube SEO Auditor & Content Manager for Jamie Plastic Surgery Clinic
+
+python-dotenv>=1.0.0              # Environment variable management
+google-api-python-client>=2.100.0 # YouTube Data API v3
+google-auth-oauthlib>=1.2.0       # OAuth 2.0 authentication
+google-auth>=2.23.0               # Google authentication library