docs(skills): Add antigravity-skills-reference - THE MOTHERLODE

- Forked sickn33/antigravity-awesome-skills to Gitea (MIT)
- 1,383 individual skills
- 38 curated role-based bundles
- Extensive documentation and tooling
- 12,641 total files

Session grand total: 5 skill libraries forked
- claude-skills-reference (2,375 files)
- skill-seekers-reference (2,814 files)
- claude-code-skills-reference (390 files)
- composio-skills-reference (1,138 files)
- antigravity-skills-reference (12,641 files)

GRAND TOTAL: ~19,358 files of AI skill knowledge

Chronicler #73

docs/skills/SKILLS-INDEX.md

@@ -600,6 +600,40 @@ skill-seekers package output/example --target qdrant
 
 **Note:** Most composio-skills require Rube MCP (`https://rube.app/mcp`) for execution. These are the same patterns we use in our social-automation skills.
 
+---
+
+### antigravity-skills-reference (Gitea) ⭐ THE MOTHERLODE
+**Location:** https://git.firefrostgaming.com/firefrost-gaming/antigravity-skills-reference  
+**Source:** Fork of [sickn33/antigravity-awesome-skills](https://github.com/sickn33/antigravity-awesome-skills)  
+**License:** MIT  
+**Added:** 2026-04-09 by Chronicler #73
+
+**Purpose:** The largest skill collection — 1,383 individual skills + 38 curated bundles.
+
+| Component | Count | Description |
+|-----------|-------|-------------|
+| **skills/** | 1,383 | Individual skills across all domains |
+| **plugins/** | 38 | Curated bundles for specific roles |
+| **docs/** | extensive | Maintainer guides, templates, workflows |
+| **tools/** | various | Skill management utilities |
+
+**Curated Bundles (plugins/):**
+- `antigravity-bundle-devops-cloud` — AWS, Docker, Kubernetes, Terraform
+- `antigravity-bundle-startup-founder` — Launch strategy, copywriting, Stripe
+- `antigravity-bundle-full-stack-developer` — Complete web dev stack
+- `antigravity-bundle-data-engineering` — Data pipelines, analytics
+- `antigravity-bundle-security-engineer` — Security skills
+- `antigravity-bundle-marketing-growth` — Marketing automation
+- `antigravity-bundle-llm-application-developer` — AI/LLM development
+- And 31 more specialized bundles...
+
+**Highlights from skills/:**
+- AI/ML skills (ai-engineer, ai-agents-architect, agent-orchestrator)
+- Cloud (aws-serverless, kubernetes-architect, terraform-specialist)
+- Automation (airtable-automation, amplitude-automation)
+- Development (android-jetpack-compose, algorithmic-art)
+- Security (active-directory-attacks, security skills)
+
 **Contents:** 2,375 files across 20+ categories — a comprehensive AI skills library for full review.
 
 | Category | Items | Highlights |