Add SEO skills 33-34 and fix bugs in skills 19-34

New skills:
- Skill 33: Site migration planner with redirect mapping and monitoring
- Skill 34: Reporting dashboard with HTML charts and Korean executive reports

Bug fixes (Skill 34 - report_aggregator.py):
- Add audit_type fallback for skill identification (was only using audit_id prefix)
- Extract health scores from nested data dict (technical_score, onpage_score, etc.)
- Support subdomain matching in domain filter (blog.ourdigital.org matches ourdigital.org)
- Skip self-referencing DASH- aggregated reports

Bug fixes (Skill 20 - naver_serp_analyzer.py):
- Remove VIEW tab selectors (removed by Naver in 2026)
- Add new section detectors: books (도서), shortform (숏폼), influencer (인플루언서)

Improvements (Skill 34 - dashboard/executive report):
- Add Korean category labels for Chart.js charts (기술 SEO, 온페이지, etc.)
- Add Korean trend labels (개선 중 ↑, 안정 →, 하락 중 ↓)
- Add English→Korean issue description translation layer (20 common patterns)

Documentation improvements:
- Add Korean triggers to 4 skill descriptions (19, 25, 28, 31)
- Expand Skill 32 SKILL.md from 40→143 lines (was 6/10, added workflow, output format, limitations)
- Add output format examples to Skills 27 and 28 SKILL.md
- Add limitations sections to Skills 27 and 28
- Update README.md, CLAUDE.md, AGENTS.md for skills 33-34

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom-skills/33-seo-migration-planner/README.md

@@ -0,0 +1,91 @@
+# SEO Migration Planner
+
+SEO 사이트 이전 계획 및 모니터링 도구 - 사전 위험 평가, 리디렉트 매핑, 이전 후 트래픽/인덱싱 추적.
+
+## Overview
+
+Pre-migration risk assessment, redirect mapping, URL inventory, crawl baseline capture, and post-migration traffic/indexation monitoring for site migrations. Supports domain moves, platform changes, URL restructuring, HTTPS migrations, and subdomain consolidation.
+
+## Dual-Platform Structure
+
+```
+33-seo-migration-planner/
+├── code/                              # Claude Code version
+│   ├── CLAUDE.md                      # Action-oriented directive
+│   ├── commands/
+│   │   └── seo-migration-planner.md   # Slash command
+│   └── scripts/
+│       ├── migration_planner.py       # Pre-migration planning
+│       ├── migration_monitor.py       # Post-migration monitoring
+│       ├── base_client.py             # Shared async utilities
+│       └── requirements.txt
+│
+├── desktop/                           # Claude Desktop version
+│   ├── SKILL.md                       # MCP-based workflow
+│   ├── skill.yaml                     # Extended metadata
+│   └── tools/
+│       ├── ahrefs.md                  # Ahrefs MCP tools
+│       ├── firecrawl.md               # Firecrawl MCP tools
+│       └── notion.md                  # Notion MCP tools
+│
+└── README.md
+```
+
+## Quick Start
+
+### Claude Code
+```bash
+/seo-migration-planner https://example.com --type domain-move --new-domain https://new-example.com
+```
+
+### Python Script
+```bash
+pip install -r code/scripts/requirements.txt
+
+# Pre-migration planning
+python code/scripts/migration_planner.py --domain https://example.com --type domain-move --new-domain https://new-example.com --json
+
+# Post-migration monitoring
+python code/scripts/migration_monitor.py --domain https://new-example.com --migration-date 2025-01-15 --baseline baseline.json --json
+```
+
+## Features
+
+### Pre-Migration Planning
+- URL inventory via Firecrawl crawl
+- Ahrefs traffic/keyword/backlink baseline
+- Per-URL risk scoring (0-100)
+- Redirect map generation (301 mappings)
+- Type-specific pre-migration checklist (Korean)
+
+### Post-Migration Monitoring
+- Pre vs post traffic comparison
+- Redirect health check (broken, chains, loops)
+- Indexation change tracking
+- Keyword ranking monitoring
+- Recovery timeline estimation
+- Automated alert generation
+
+## Migration Types
+
+| Type | Description |
+|------|-------------|
+| `domain-move` | Old domain -> new domain |
+| `platform` | CMS/framework migration |
+| `url-restructure` | Path/slug changes |
+| `https` | HTTP -> HTTPS |
+| `subdomain` | Subdomain -> subfolder |
+
+## Notion Output
+
+Reports are saved to the OurDigital SEO Audit Log database:
+- **Title**: `사이트 이전 계획 - [domain] - YYYY-MM-DD`
+- **Database ID**: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
+- **Audit ID Format**: MIGR-YYYYMMDD-NNN
+
+## Triggers
+
+- site migration, domain move, redirect mapping
+- platform migration, URL restructuring
+- HTTPS migration, subdomain consolidation
+- 사이트 이전, 도메인 이전, 리디렉트 매핑