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/10-seo-technical-audit/desktop/SKILL.md

@@ -0,0 +1,94 @@
+---
+name: seo-technical-audit
+version: 1.0.0
+description: Technical SEO auditor for crawlability fundamentals. Triggers: robots.txt, sitemap validation, crawlability, indexing check, technical SEO.
+allowed-tools: mcp__firecrawl__*, mcp__perplexity__*, mcp__notion__*
+---
+
+# SEO Technical Audit
+
+## Purpose
+
+Analyze crawlability fundamentals: robots.txt rules, XML sitemap structure, and URL accessibility. Identify issues blocking search engine crawlers.
+
+## Core Capabilities
+
+1. **Robots.txt Analysis** - Parse rules, check blocked resources
+2. **Sitemap Validation** - Verify XML structure, URL limits, dates
+3. **URL Accessibility** - Check HTTP status, redirects, broken links
+
+## MCP Tool Usage
+
+### Firecrawl for Page Data
+```
+mcp__firecrawl__scrape: Fetch robots.txt and sitemap content
+mcp__firecrawl__crawl: Check multiple URLs accessibility
+```
+
+### Perplexity for Best Practices
+```
+mcp__perplexity__search: Research current SEO recommendations
+```
+
+## Workflow
+
+### 1. Robots.txt Check
+1. Fetch `[domain]/robots.txt` using Firecrawl
+2. Parse User-agent rules and Disallow patterns
+3. Identify blocked resources (CSS, JS, images)
+4. Check for Sitemap declarations
+5. Report critical issues
+
+### 2. Sitemap Validation
+1. Locate sitemap (from robots.txt or `/sitemap.xml`)
+2. Validate XML syntax
+3. Check URL count (max 50,000)
+4. Verify lastmod date formats
+5. For sitemap index: parse child sitemaps
+
+### 3. URL Accessibility Sampling
+1. Extract URLs from sitemap
+2. Sample 50-100 URLs for large sites
+3. Check HTTP status codes
+4. Identify redirects and broken links
+5. Report 4xx/5xx errors
+
+## Output Format
+
+```markdown
+## Technical SEO Audit: [domain]
+
+### Robots.txt Analysis
+- Status: [Valid/Invalid/Missing]
+- Sitemap declared: [Yes/No]
+- Critical blocks: [List]
+
+### Sitemap Validation
+- URLs found: [count]
+- Syntax: [Valid/Errors]
+- Issues: [List]
+
+### URL Accessibility (sampled)
+- Checked: [count] URLs
+- Success (2xx): [count]
+- Redirects (3xx): [count]
+- Errors (4xx/5xx): [count]
+
+### Recommendations
+1. [Priority fixes]
+```
+
+## Common Issues
+
+| Issue | Impact | Fix |
+|-------|--------|-----|
+| No sitemap in robots.txt | Medium | Add `Sitemap:` directive |
+| Blocking CSS/JS | High | Allow Googlebot access |
+| 404s in sitemap | High | Remove or fix URLs |
+| Missing lastmod | Low | Add dates for freshness signals |
+
+## Limitations
+
+- Cannot access password-protected sitemaps
+- Large sitemaps (10,000+ URLs) require sampling
+- Does not check render-blocking issues (use Core Web Vitals skill)