refactor(skills): Restructure skills to dual-platform architecture

Major refactoring of ourdigital-custom-skills with new numbering system:

## Structure Changes
- Each skill now has code/ (Claude Code) and desktop/ (Claude Desktop) versions
- New progressive numbering: 01-09 General, 10-19 SEO, 20-29 GTM, 30-39 OurDigital, 40-49 Jamie

## Skill Reorganization
- 01-notion-organizer (from 02)
- 10-18: SEO tools split into focused skills (technical, on-page, local, schema, vitals, gsc, gateway)
- 20-21: GTM audit and manager
- 30-32: OurDigital designer, research, presentation
- 40-41: Jamie brand editor and audit

## New Files
- .claude/commands/: Slash command definitions for all skills
- CLAUDE.md: Updated with new skill structure documentation
- REFACTORING_PLAN.md: Migration documentation
- COMPATIBILITY_REPORT.md, SKILLS_COMPARISON.md: Analysis docs

## Removed
- Old skill directories (02-05, 10-14, 20-21 old numbering)
- Consolidated into new structure with _archive/ for reference

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

ourdigital-custom-skills/20-gtm-audit/README.md

@@ -0,0 +1,90 @@
+# OurDigital GTM Audit
+
+Lightweight Google Tag Manager audit toolkit powered by Playwright.
+
+> **Note**: For comprehensive GTM management including dataLayer tag generation, see [14-ourdigital-gtm-manager](../14-ourdigital-gtm-manager/).
+
+## Features
+
+- **Container Detection**: Verify GTM installation, position, and duplicates
+- **DataLayer Validation**: Event structure, types, sequence checking
+- **Form Tracking**: Form discovery, field analysis, event verification
+- **E-commerce Checkout**: Full funnel flow simulation and validation
+- **Multi-Platform**: GA4, Meta Pixel, LinkedIn, Google Ads, Kakao, Naver
+
+## Installation
+
+```bash
+# Clone or download
+cd gtm-audit-claude-code
+
+# Install dependencies
+pip install -r requirements.txt
+
+# Install Playwright browsers
+playwright install chromium
+```
+
+## Usage
+
+```bash
+# Full audit
+python gtm_audit.py --url "https://yoursite.com" --journey full
+
+# Specific container validation
+python gtm_audit.py --url "https://yoursite.com" --container "GTM-XXXXXX"
+
+# Form tracking only
+python gtm_audit.py --url "https://yoursite.com/contact" --journey form
+
+# E-commerce checkout
+python gtm_audit.py --url "https://yoursite.com/cart" --journey checkout
+```
+
+## Options
+
+| Option | Description | Default |
+|--------|-------------|---------|
+| `--url` | Target URL (required) | - |
+| `--container` | Expected GTM container ID | None |
+| `--journey` | Audit type: pageview, scroll, form, checkout, datalayer, full | full |
+| `--output` | Output file path | gtm_audit_report.json |
+| `--timeout` | Page load timeout (ms) | 30000 |
+| `--headless` | Run browser headless | True |
+
+## Output
+
+Generates JSON report with:
+- Container status
+- DataLayer events and validation issues
+- Form analysis and tracking readiness
+- Checkout flow analysis
+- Network requests by destination
+- Recommendations and checklist
+
+## Using with Claude Code
+
+This project includes a `CLAUDE.md` file optimized for use with Claude Code.
+
+```bash
+# In your terminal
+claude
+
+# Then ask Claude to run audits
+> Run a GTM audit on https://example.com
+> Check the form tracking on https://example.com/contact
+> Analyze the checkout flow issues in the latest report
+```
+
+## Documentation
+
+See `docs/` folder for:
+- GA4 event specifications
+- E-commerce dataLayer schemas
+- Form tracking patterns
+- Checkout flow sequences
+- Common issues and fixes
+
+## License
+
+MIT