docs(skills): Add claude-skills-reference library to SKILLS-INDEX

- Forked alirezarezvani/claude-skills to Gitea (MIT License)
- 2,375 files across 20+ categories
- Reference library for future skill mining
- Added External Skills Libraries section

Chronicler #73

docs/skills/SKILLS-INDEX.md

@@ -521,6 +521,37 @@ docs/skills/
 
 ---
 
+## 📦 External Skills Libraries
+
+### claude-skills-reference (Gitea)
+**Location:** https://git.firefrostgaming.com/firefrost-gaming/claude-skills-reference  
+**Source:** Fork of [alirezarezvani/claude-skills](https://github.com/alirezarezvani/claude-skills)  
+**License:** MIT  
+**Added:** 2026-04-09 by Chronicler #73
+
+**Contents:** 2,375 files across 20+ categories — a comprehensive AI skills library for full review.
+
+| Category | Items | Highlights |
+|----------|-------|------------|
+| engineering/ | 45 | mcp-server-builder, ci-cd-pipeline-builder, docker-development |
+| engineering-team/ | 59 | senior-backend, senior-frontend, senior-devops, senior-architect |
+| marketing-skill/ | 55 | content-strategy, copywriting, launch-strategy, email-sequence |
+| product-team/ | 18 | landing-page-generator, product-analytics, roadmap-communicator |
+| project-management/ | 14 | scrum-master, meeting-analyzer, jira-expert |
+| c-level-advisor/ | 34 | cto-advisor, cfo-advisor, ceo-advisor, founder-coach |
+| business-growth/ | 6 | customer-success-manager, revenue-operations |
+| finance/ | 5 | saas-metrics-coach, financial-analyst |
+| ra-qm-team/ | 29 | GDPR, ISO compliance, FDA, quality management |
+| commands/ | 23 | Quick slash commands (OKR, sprint, PRD, changelog) |
+
+**How to Use:**
+1. Browse the repo for skills relevant to your task
+2. Copy useful skills to `docs/skills/` in the operations manual
+3. Add entry to this SKILLS-INDEX
+4. Commit both files
+
+---
+
 ## 🔗 Related Documents
 
 - `docs/standards/FFG-STD-004-memorial-protocol.md` — Memorial standard (chronicler-handoff encodes this)