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/31-seo-competitor-intel/code/CLAUDE.md

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+# CLAUDE.md
+
+## Overview
+
+Competitor intelligence and benchmarking tool for comprehensive SEO competitive analysis. Auto-discovers competitors via Ahrefs, builds competitor profile cards (DR, traffic, keywords, backlinks, content volume), creates head-to-head comparison matrices, tracks traffic trends, analyzes keyword overlap, compares content freshness/volume, and scores competitive threats. Supports Korean market competitor analysis including Naver Blog/Cafe presence.
+
+## Quick Start
+
+```bash
+pip install -r scripts/requirements.txt
+
+# Competitor profiling
+python scripts/competitor_profiler.py --target https://example.com --json
+
+# Competitive monitoring
+python scripts/competitive_monitor.py --target https://example.com --period 30 --json
+```
+
+## Scripts
+
+| Script | Purpose | Key Output |
+|--------|---------|------------|
+| `competitor_profiler.py` | Build competitor profiles and comparison matrix | Competitor cards, head-to-head matrix, threat scores |
+| `competitive_monitor.py` | Track competitive changes over time | Traffic trends, keyword movement, content velocity |
+| `base_client.py` | Shared utilities | RateLimiter, ConfigManager, BaseAsyncClient |
+
+## Competitor Profiler
+
+```bash
+# Auto-discover and profile competitors
+python scripts/competitor_profiler.py --target https://example.com --json
+
+# Specify competitors manually
+python scripts/competitor_profiler.py --target https://example.com --competitor https://comp1.com --competitor https://comp2.com --json
+
+# Limit auto-discovery count
+python scripts/competitor_profiler.py --target https://example.com --max-competitors 10 --json
+
+# Include Korean market analysis
+python scripts/competitor_profiler.py --target https://example.com --korean-market --json
+```
+
+**Capabilities**:
+- Competitor auto-discovery via Ahrefs organic-competitors
+- Competitor profile cards:
+  - Domain Rating (DR)
+  - Organic traffic estimate
+  - Total organic keywords
+  - Referring domains count
+  - Top pages count
+  - Content volume estimate
+- Head-to-head comparison matrix across all SEO dimensions
+- Keyword overlap analysis (shared, unique to target, unique to competitor, gap)
+- Content volume and freshness comparison
+- Competitive threat scoring (0-100) based on growth trajectory, keyword overlap, DR gap
+- Korean market: Naver Blog/Cafe presence detection for competitors
+
+## Competitive Monitor
+
+```bash
+# 30-day competitive monitoring
+python scripts/competitive_monitor.py --target https://example.com --period 30 --json
+
+# With specific competitors
+python scripts/competitive_monitor.py --target https://example.com --competitor https://comp1.com --period 60 --json
+
+# Traffic trend comparison
+python scripts/competitive_monitor.py --target https://example.com --scope traffic --period 90 --json
+```
+
+**Capabilities**:
+- Traffic trend comparison (6-12 month history)
+- DR trend comparison over time
+- New/lost keyword tracking per competitor
+- Referring domain growth comparison
+- Content publication velocity comparison
+- Top page changes (new top pages, declining pages)
+- Alert generation for significant competitive movements
+- Market share estimation based on organic traffic
+
+## Ahrefs MCP Tools Used
+
+| Tool | Purpose |
+|------|---------|
+| `site-explorer-metrics` | Current organic metrics |
+| `site-explorer-metrics-history` | Historical metrics trends |
+| `site-explorer-organic-competitors` | Discover organic competitors |
+| `site-explorer-organic-keywords` | Keyword rankings per domain |
+| `site-explorer-top-pages` | Top performing pages |
+| `site-explorer-pages-by-traffic` | Pages ranked by traffic |
+| `site-explorer-domain-rating` | Domain Rating |
+| `site-explorer-domain-rating-history` | DR trend |
+| `site-explorer-referring-domains` | Referring domain list |
+| `site-explorer-backlinks-stats` | Backlink overview |
+| `site-explorer-pages-history` | Page index history |
+
+## Output Format
+
+```json
+{
+  "target": "example.com",
+  "competitors": [
+    {
+      "domain": "competitor1.com",
+      "profile": {
+        "domain_rating": 55,
+        "organic_traffic": 25000,
+        "organic_keywords": 3500,
+        "referring_domains": 1200,
+        "top_pages": 150
+      },
+      "threat_score": 78,
+      "keyword_overlap": {
+        "shared": 450,
+        "unique_competitor": 800,
+        "unique_target": 600,
+        "gap": 350
+      }
+    }
+  ],
+  "comparison_matrix": {},
+  "market_position": "challenger",
+  "timestamp": "2025-01-01T00:00:00"
+}
+```
+
+## Notion Output (Required)
+
+**IMPORTANT**: All audit reports MUST be saved to the OurDigital SEO Audit Log database.
+
+### Database Configuration
+
+| Field | Value |
+|-------|-------|
+| Database ID | `2c8581e5-8a1e-8035-880b-e38cefc2f3ef` |
+| URL | https://www.notion.so/dintelligence/2c8581e58a1e8035880be38cefc2f3ef |
+
+### Required Properties
+
+| Property | Type | Description |
+|----------|------|-------------|
+| Issue | Title | Report title (Korean + date) |
+| Site | URL | Target website URL |
+| Category | Select | Competitor Intelligence |
+| Priority | Select | Based on threat level |
+| Found Date | Date | Report date (YYYY-MM-DD) |
+| Audit ID | Rich Text | Format: COMP-YYYYMMDD-NNN |
+
+### Language Guidelines
+
+- Report content in Korean (한국어)
+- Keep technical English terms as-is (e.g., Domain Rating, Organic Traffic, Threat Score)
+- URLs and code remain unchanged