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/26-seo-international/desktop/tools/ahrefs.md

@@ -0,0 +1,43 @@
+# Ahrefs
+
+## Tools Used
+
+### site-explorer-metrics-by-country
+- **Purpose**: Get country-level organic traffic distribution
+- **Usage**: Analyze which countries drive traffic to identify international SEO opportunities
+- **Parameters**: `target` (domain), `country` (optional filter)
+- **Example**:
+  ```
+  mcp__ahrefs__site-explorer-metrics-by-country:
+    target: example.com
+  ```
+
+### site-explorer-organic-keywords
+- **Purpose**: Get organic keyword rankings filtered by country
+- **Usage**: Analyze keyword performance in specific markets
+- **Parameters**: `target` (domain), `country` (ISO country code)
+- **Example**:
+  ```
+  mcp__ahrefs__site-explorer-organic-keywords:
+    target: example.com
+    country: kr
+  ```
+
+## Configuration
+
+- Ahrefs MCP server must be connected in Claude Desktop
+- API access requires active Ahrefs subscription
+
+## Common Patterns
+
+### Country Traffic Analysis
+1. Call `site-explorer-metrics-by-country` to get traffic distribution
+2. Identify top countries by organic traffic share
+3. Compare with hreflang implementation coverage
+4. Flag countries with traffic but no localized version
+
+### Keyword Gap by Market
+1. Call `site-explorer-organic-keywords` with country filter
+2. Compare keyword counts across target markets
+3. Identify markets with low keyword coverage
+4. Recommend content localization priorities