feat(skills): bulk-add root SKILL.md to 61 skills (native Agent Skills loadability)

Run the additive migration pass from SKILL-MIGRATION-GUIDE: generate a root SKILL.md
for every skill that lacked one, copied from its desktop/SKILL.md (or code/SKILL.md),
with name set to the directory name and description + body preserved verbatim.

- scripts/migrate_skill_root.py: the reusable, non-destructive migrator (dry-run default).
- 61 new root SKILL.md (desktop source for most; code/SKILL.md for 61/62/92).
- Untouched: 16/17/95 (already had root); desktop/ and code/ packaging left intact.
- All 64 root SKILL.md validate: frontmatter <=1024, kebab name, description present.

Still MANUAL (no SKILL.md source — commands/README only), need hand-authored root SKILL.md:
81-mac-optimizer, 90-reference-curator, 91-multi-agent-guide, 94-dintel-bootstrap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom-skills/11-seo-comprehensive-audit/SKILL.md

@@ -0,0 +1,109 @@
+---
+name: 11-seo-comprehensive-audit
+description: |
+  Comprehensive SEO audit orchestrator. Runs 6-stage audit pipeline (Technical, On-Page, CWV, Schema, Local, GSC) and produces a unified report with weighted health score.
+  Triggers: comprehensive SEO, full SEO audit, 종합 SEO 감사, site audit, SEO health check.
+---
+
+# Comprehensive SEO Audit
+
+## Purpose
+
+Orchestrate a full-spectrum SEO audit by running 6 specialized analyses and synthesizing results into a unified health score and actionable report.
+
+## Pipeline Stages
+
+| # | Stage | Source Skill | Default |
+|---|-------|-------------|---------|
+| 1 | Technical SEO | 12-seo-technical-audit | Always |
+| 2 | On-Page SEO | 13-seo-on-page-audit | Always |
+| 3 | Core Web Vitals | 14-seo-core-web-vitals | Always |
+| 4 | Schema Validation | 16-seo-schema-validator | Always |
+| 5 | Local SEO | 18-seo-local-audit | Skippable |
+| 6 | Search Console | 15-seo-search-console | Skippable |
+
+## Workflow
+
+### 1. Initialization
+1. Receive target URL from user
+2. Confirm which stages to run (all 6 by default)
+3. Set up audit tracking ID: `COMP-YYYYMMDD-NNN`
+
+### 2. Execute Stages (Sequential)
+For each active stage:
+1. Run the sub-skill analysis
+2. Collect JSON results
+3. Extract score and issues
+
+### 3. Synthesis
+1. Compute weighted health score (0-100)
+2. Assign grade (A/B+/B/C/D/F)
+3. Prioritize critical and high-severity findings
+4. Generate recommendations
+
+### 4. Notion Report
+1. Create summary page: `종합 SEO 감사 보고서 - [domain] - YYYY-MM-DD`
+2. Create individual pages for Critical/High findings
+3. Database: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
+
+## Health Score Weights
+
+| Category | Weight |
+|----------|--------|
+| Technical SEO | 20% |
+| On-Page SEO | 20% |
+| Core Web Vitals | 25% |
+| Schema | 15% |
+| Local SEO | 10% |
+| Search Console | 10% |
+
+Skipped stages redistribute weight proportionally.
+
+## Output Format
+
+```markdown
+## 종합 SEO 감사 보고서: [domain]
+
+**Health Score**: [score]/100 ([grade])
+**Date**: YYYY-MM-DD
+**Audit ID**: COMP-YYYYMMDD-NNN
+
+### Stage Results
+| Stage | Score | Issues |
+|-------|-------|--------|
+| Technical SEO | XX/100 | N issues |
+| On-Page SEO | XX/100 | N issues |
+| Core Web Vitals | XX/100 | N issues |
+| Schema | XX/100 | N issues |
+| Local SEO | XX/100 | N issues |
+| Search Console | XX/100 | N issues |
+
+### Critical Findings
+1. [Finding with recommendation]
+
+### Recommendations (Priority Order)
+1. [Action item]
+```
+
+## MCP Tool Usage
+
+### Firecrawl
+```
+mcp__firecrawl__scrape: Fetch page content for on-page and schema analysis
+```
+
+### Notion
+```
+mcp__notion__*: Create audit report pages in SEO database
+```
+
+### Perplexity
+```
+mcp__perplexity__search: Research best practices for recommendations
+```
+
+## Limitations
+
+- Local SEO stage requires manual input for NAP/GBP data
+- Search Console stage requires GSC API credentials
+- Health score accuracy improves when all 6 stages are active