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/ahrefs.md

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+# Ahrefs
+
+## Tools Used
+
+### site-explorer-all-backlinks
+- **Purpose**: Get all backlinks for a target domain
+- **Parameters**: target, mode (domain/prefix/url), limit, order_by
+- **Returns**: List of backlinks with source URL, domain, DR, anchor, dofollow status
+
+### site-explorer-backlinks-stats
+- **Purpose**: Backlink statistics overview
+- **Parameters**: target, mode
+- **Returns**: Total backlinks, referring domains, dofollow/nofollow counts
+
+### site-explorer-referring-domains
+- **Purpose**: List all referring domains
+- **Parameters**: target, mode, limit, order_by
+- **Returns**: Domains with DR, backlinks count, traffic, country
+
+### site-explorer-anchors
+- **Purpose**: Anchor text distribution
+- **Parameters**: target, mode, limit, order_by
+- **Returns**: Anchor texts with backlink and referring domain counts
+
+### site-explorer-broken-backlinks
+- **Purpose**: Find broken backlinks for recovery
+- **Parameters**: target, mode, limit, order_by
+- **Returns**: Broken links with source, target URL, HTTP code, DR
+
+### site-explorer-domain-rating
+- **Purpose**: Get Domain Rating for a target
+- **Parameters**: target
+- **Returns**: Domain Rating value and Ahrefs rank
+
+### site-explorer-domain-rating-history
+- **Purpose**: DR trend over time
+- **Parameters**: target, date_from
+- **Returns**: Historical DR data points
+
+### site-explorer-refdomains-history
+- **Purpose**: Referring domains trend over time
+- **Parameters**: target, mode, date_from
+- **Returns**: Historical referring domain counts
+
+### site-explorer-linked-domains
+- **Purpose**: Domains linked from the target
+- **Parameters**: target, mode, limit
+- **Returns**: Outgoing linked domains with counts
+
+## Configuration
+
+- Ahrefs MCP tools are available via `mcp__ahrefs__*` prefix
+- No API key needed when using MCP (handled by tool server)
+- Rate limits: Follow Ahrefs plan limits (typically 500 rows/request)
+
+## Examples
+
+```
+# Get backlink stats
+mcp__ahrefs__site-explorer-backlinks-stats(target="example.com", mode="domain")
+
+# Get referring domains sorted by DR
+mcp__ahrefs__site-explorer-referring-domains(target="example.com", mode="domain", limit=500, order_by="domain_rating:desc")
+
+# Get anchor text distribution
+mcp__ahrefs__site-explorer-anchors(target="example.com", mode="domain", limit=200)
+
+# Find broken backlinks
+mcp__ahrefs__site-explorer-broken-backlinks(target="example.com", mode="domain", limit=100)
+```

custom-skills/22-seo-link-building/desktop/tools/notion.md

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+# Notion
+
+## Tools Used
+
+### notion-create-pages
+- **Purpose**: Save link building audit reports to SEO Audit Log
+- **Database ID**: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
+- **Required Properties**:
+  - Issue (title): Report title in Korean with date
+  - Site (url): Audited website URL
+  - Category (select): "Link Building"
+  - Priority (select): Critical / High / Medium / Low
+  - Found Date (date): YYYY-MM-DD
+  - Audit ID (rich_text): LINK-YYYYMMDD-NNN
+
+### notion-update-page
+- **Purpose**: Update existing audit entries with follow-up findings
+
+## Configuration
+
+- Notion MCP tools available via `mcp__notion__*` prefix
+- Authentication handled by MCP tool server
+
+## Examples
+
+```
+# Create a link building audit report
+mcp__notion__notion-create-pages(
+  parent={"database_id": "2c8581e5-8a1e-8035-880b-e38cefc2f3ef"},
+  properties={
+    "Issue": {"title": [{"text": {"content": "백링크 프로필 분석 - example.com (2025-01-15)"}}]},
+    "Site": {"url": "https://example.com"},
+    "Category": {"select": {"name": "Link Building"}},
+    "Priority": {"select": {"name": "High"}},
+    "Found Date": {"date": {"start": "2025-01-15"}},
+    "Audit ID": {"rich_text": [{"text": {"content": "LINK-20250115-001"}}]}
+  }
+)
+```

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

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+# 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?")
+```