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/19-seo-keyword-strategy/desktop/SKILL.md

@@ -0,0 +1,91 @@
+---
+name: seo-keyword-strategy
+description: |
+  Keyword strategy and research for SEO campaigns. Triggers: keyword research, keyword analysis, keyword gap, search volume, keyword clustering, intent classification.
+---
+
+# SEO Keyword Strategy & Research
+
+## Purpose
+
+Expand seed keywords, classify search intent, cluster topics, and identify competitor keyword gaps for comprehensive keyword strategy development.
+
+## Core Capabilities
+
+1. **Keyword Expansion** - Matching terms, related terms, search suggestions
+2. **Korean Market** - Suffix expansion, Naver autocomplete, Korean intent patterns
+3. **Intent Classification** - Informational, navigational, commercial, transactional
+4. **Topic Clustering** - Group keywords into semantic clusters
+5. **Gap Analysis** - Find competitor keywords missing from target site
+
+## MCP Tool Usage
+
+### Ahrefs for Keyword Data
+```
+mcp__ahrefs__keywords-explorer-overview: Get keyword metrics
+mcp__ahrefs__keywords-explorer-matching-terms: Find keyword variations
+mcp__ahrefs__keywords-explorer-related-terms: Discover related keywords
+mcp__ahrefs__keywords-explorer-search-suggestions: Autocomplete suggestions
+mcp__ahrefs__keywords-explorer-volume-by-country: Country volume comparison
+mcp__ahrefs__site-explorer-organic-keywords: Competitor keyword rankings
+```
+
+### Web Search for Naver Discovery
+```
+WebSearch: Naver autocomplete and trend discovery
+```
+
+## Workflow
+
+### 1. Seed Keyword Expansion
+1. Input seed keyword (Korean or English)
+2. Query Ahrefs matching-terms and related-terms
+3. Get search suggestions for long-tail variations
+4. Apply Korean suffix expansion if Korean market
+5. Deduplicate and merge results
+
+### 2. Intent Classification & Clustering
+1. Classify each keyword by search intent
+2. Group keywords into topic clusters
+3. Identify pillar topics and supporting terms
+4. Calculate cluster-level metrics (total volume, avg KD)
+
+### 3. Gap Analysis
+1. Pull organic keywords for target and competitors
+2. Identify keywords present in competitors but missing from target
+3. Score opportunities by volume/difficulty ratio
+4. Prioritize by intent alignment with business goals
+
+## Output Format
+
+```markdown
+## Keyword Strategy Report: [seed keyword]
+
+### Overview
+- Total keywords discovered: [count]
+- Topic clusters: [count]
+- Total search volume: [sum]
+
+### Top Clusters
+| Cluster | Keywords | Total Volume | Avg KD |
+|---------|----------|-------------|--------|
+| ... | ... | ... | ... |
+
+### Top Opportunities
+| Keyword | Volume | KD | Intent | Cluster |
+|---------|--------|-----|--------|---------|
+| ... | ... | ... | ... | ... |
+
+### Keyword Gaps (vs competitors)
+| Keyword | Volume | Competitor Position | Opportunity Score |
+|---------|--------|-------------------|-------------------|
+| ... | ... | ... | ... |
+```
+
+## Notion Output (Required)
+
+All audit reports MUST be saved to OurDigital SEO Audit Log:
+- **Database ID**: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
+- **Properties**: Issue (title), Site (url), Category, Priority, Found Date, Audit ID
+- **Language**: Korean with English technical terms
+- **Audit ID Format**: KW-YYYYMMDD-NNN