Add SEO skills 19-28, 31-32 with full Python implementations

12 new skills: Keyword Strategy, SERP Analysis, Position Tracking,
Link Building, Content Strategy, E-Commerce SEO, KPI Framework,
International SEO, AI Visibility, Knowledge Graph, Competitor Intel,
and Crawl Budget. ~20K lines of Python across 25 domain scripts.
Updated skill 11 pipeline table and repo CLAUDE.md.
Enhanced skill 18 local SEO workflow from jamie.clinic audit.

Note: Skill 26 hreflang_validator.py pending (content filter block).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom-skills/27-seo-ai-visibility/desktop/tools/websearch.md

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+# WebSearch & WebFetch Tools
+
+## WebSearch
+
+Use web search to supplement AI visibility analysis with additional context:
+- Research competitor AI optimization strategies
+- Find industry benchmarks for AI search visibility
+- Look up latest AI search engine algorithm updates
+- Discover best practices for AI citation optimization
+
+## WebFetch
+
+Use web fetch to retrieve specific pages for deeper analysis:
+- Fetch competitor pages that are frequently cited in AI answers
+- Retrieve structured data (Schema Markup) from cited pages
+- Analyze content structure of top-cited URLs
+- Check E-E-A-T signals on referenced pages