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/28-seo-knowledge-graph/desktop/SKILL.md

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+---
+name: seo-knowledge-graph
+description: |
+  Knowledge Graph and entity SEO analysis. Triggers: knowledge panel, entity SEO, knowledge graph, PAA, FAQ schema, Wikipedia, Wikidata, brand entity.
+---
+
+# Knowledge Graph & Entity SEO
+
+Analyze brand entity presence in Google Knowledge Graph, Knowledge Panels, People Also Ask (PAA), and FAQ rich results. Check entity attribute completeness, Wikipedia/Wikidata presence, and Korean equivalents (Naver knowledge iN, Naver encyclopedia).
+
+## Capabilities
+
+### Knowledge Graph Analysis
+- Knowledge Panel detection and attribute extraction
+- Entity attribute completeness scoring (name, description, logo, type, social profiles, website, founded, CEO)
+- Wikipedia article presence check
+- Wikidata entity presence check (QID lookup)
+- Naver encyclopedia (네이버 백과사전) presence
+- Naver knowledge iN (지식iN) presence
+
+### Entity SEO Audit
+- People Also Ask (PAA) monitoring for brand-related queries
+- FAQ schema presence tracking (FAQPage schema -> SERP appearance)
+- Entity markup audit (Organization, Person, LocalBusiness schema on website)
+- Social profile linking validation (sameAs in schema)
+- Brand SERP analysis (what appears when you search the brand name)
+- Entity consistency across web properties
+
+## Workflow
+
+### Knowledge Graph Analysis
+
+1. Use **WebSearch** to search for the entity name on Google
+2. Analyze search results for Knowledge Panel indicators
+3. Use **WebFetch** to check Wikipedia article existence
+4. Use **WebFetch** to check Wikidata QID existence
+5. Use **WebFetch** to check Naver encyclopedia and 지식iN
+6. Score entity attribute completeness
+7. Save report to **Notion** SEO Audit Log
+
+### Entity SEO Audit
+
+1. Use **WebFetch** to fetch the website and extract JSON-LD schemas
+2. Validate Organization/Person/LocalBusiness schema completeness
+3. Check sameAs links accessibility
+4. Use **WebSearch** to search brand name and analyze SERP features
+5. Monitor PAA questions for brand keywords
+6. Use **Ahrefs serp-overview** for SERP feature detection
+7. Save report to **Notion** SEO Audit Log
+
+## Tools Used
+
+| Tool | Purpose |
+|------|---------|
+| WebSearch | Search for entity/brand to detect Knowledge Panel |
+| WebFetch | Fetch Wikipedia, Wikidata, Naver pages, website schemas |
+| Ahrefs `serp-overview` | SERP feature detection for entity keywords |
+| Notion | Save audit reports to SEO Audit Log database |
+
+## Notion Output
+
+All reports must be saved to the OurDigital SEO Audit Log database.
+
+| Field | Value |
+|-------|-------|
+| Database ID | `2c8581e5-8a1e-8035-880b-e38cefc2f3ef` |
+| Category | Knowledge Graph & Entity SEO |
+| Audit ID | KG-YYYYMMDD-NNN |
+
+Report content should be written in Korean (한국어), keeping technical English terms as-is.
+
+## Reference Scripts
+
+Located in `code/scripts/`:
+- `knowledge_graph_analyzer.py` -- Knowledge Panel and entity presence analysis
+- `entity_auditor.py` -- Entity SEO signals and PAA/FAQ audit
+- `base_client.py` -- Shared async client utilities