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/22-seo-link-building/desktop/tools/websearch.md

@@ -0,0 +1,24 @@
+# WebSearch
+
+## Tools Used
+
+### WebSearch
+- **Purpose**: Research link building strategies, competitor insights, and industry best practices
+- **Usage**: Supplement Ahrefs data with web research for context
+
+### WebFetch
+- **Purpose**: Fetch specific web pages for content analysis and link prospecting
+- **Usage**: Verify link opportunities, check page content relevance
+
+## Examples
+
+```
+# Research link building strategies for a niche
+WebSearch("link building strategies for SaaS companies 2025")
+
+# Research Korean link building opportunities
+WebSearch("네이버 블로그 백링크 전략 2025")
+
+# Check if a target page is relevant for outreach
+WebFetch("https://example.com/resources", "What topics does this page cover?")
+```