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>

.claude/commands/seo-vitals.md

@@ -0,0 +1,40 @@
+# SEO Core Web Vitals
+
+Google PageSpeed Insights and Core Web Vitals analysis.
+
+## Triggers
+- "check page speed", "Core Web Vitals", "PageSpeed audit"
+
+## Capabilities
+
+1. **Performance Metrics** - LCP, FID, CLS scores
+2. **Mobile/Desktop** - Separate analysis for each
+3. **Optimization Tips** - Actionable recommendations
+4. **Historical Tracking** - Compare over time
+
+## Scripts
+
+```bash
+# Analyze single URL
+python ourdigital-custom-skills/15-seo-core-web-vitals/code/scripts/pagespeed_client.py \
+  --url https://example.com
+
+# Mobile and desktop
+python ourdigital-custom-skills/15-seo-core-web-vitals/code/scripts/pagespeed_client.py \
+  --url https://example.com --strategy both
+
+# Batch analysis
+python ourdigital-custom-skills/15-seo-core-web-vitals/code/scripts/pagespeed_client.py \
+  --urls urls.txt --output vitals_report.json
+```
+
+## Environment
+- `PAGESPEED_API_KEY` - Google API key (optional, higher quota)
+
+## Metrics Explained
+
+| Metric | Good | Needs Improvement | Poor |
+|--------|------|-------------------|------|
+| LCP | ≤2.5s | 2.5-4s | >4s |
+| FID | ≤100ms | 100-300ms | >300ms |
+| CLS | ≤0.1 | 0.1-0.25 | >0.25 |