docs: update Features & Categories section with comprehensive categorization

.gemini/antigravity/brain/2b094595-c6a8-459f-b382-555c5c55e88e/task.md

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+# Task: Create 7 New Skills from GitHub Repository Analysis
+
+## Phase 1 - High Impact
+
+- [ ] Create `prompt-library` skill
+- [ ] Create `javascript-mastery` skill
+- [ ] Create `llm-app-patterns` skill
+
+## Phase 2 - Medium Impact
+
+- [ ] Create `workflow-automation` skill
+- [ ] Create `autonomous-agent-patterns` skill
+
+## Phase 3 - Niche
+
+- [ ] Create `bun-development` skill
+- [ ] Create `github-workflow-automation` skill
+
+## Finalization
+
+- [ ] Update `skills_index.json` with all new skills
+- [ ] Update `README.md` with new skill entries
+- [ ] Run validation script

.gemini/scratchpad.md

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+# Scratchpad: GitHub Repository Analysis for Skill Extraction
+
+## Background and Motivation
+
+The user wanted to analyze popular GitHub repositories to identify useful skills/patterns that could be converted into new Antigravity skills. The goal was to expand the "Antigravity Awesome Skills" collection with high-quality, community-inspired capabilities.
+
+### Target Repositories
+
+1. n8n-io/n8n - Workflow automation
+2. f/awesome-chatgpt-prompts - Prompt collection
+3. langgenius/dify - LLM app platform
+4. google-gemini/gemini-cli - Gemini CLI
+5. oven-sh/bun - JavaScript runtime
+6. leonardomso/33-js-concepts - JS learning
+7. cline/cline - Autonomous coding agent
+8. openai/codex - OpenAI Codex
+9. cursor/cursor - AI code editor
+
+## Key Challenges and Analysis
+
+### Research Phase ✅ COMPLETED
+
+- Analyzed README content and key features of all 9 repositories
+- Identified extractable patterns from each
+- Cross-referenced with 62+ existing skills to avoid duplicates
+- Proposed 7 new skills with detailed descriptions
+
+### Created Skills
+
+1. **prompt-library** (from awesome-chatgpt-prompts)
+2. **javascript-mastery** (from 33-js-concepts)
+3. **llm-app-patterns** (from dify)
+4. **workflow-automation** (from n8n)
+5. **autonomous-agent-patterns** (from cline/codex)
+6. **bun-development** (from bun)
+7. **github-workflow-automation** (from gemini-cli)
+
+## High-level Task Breakdown
+
+- [x] **Task 1**: Research each repository's README and features
+- [x] **Task 2**: Identify extractable skills/patterns from each
+- [x] **Task 3**: Cross-reference with existing skills to avoid duplicates
+- [x] **Task 4**: Document proposed new skills with descriptions
+- [x] **Task 5**: Present findings for user review
+- [x] **Task 6**: User approved plan
+- [x] **Task 7**: Create 7 skill directories and SKILL.md files
+- [x] **Task 8**: Update skills_index.json and README.md
+- [x] **Task 9**: Run validation script - ALL PASSED
+
+## Project Status Board
+
+- [x] All tasks completed!
+- [x] Validation passed: 69 skills verified
+
+## Executor's Feedback or Assistance Requests
+
+**COMPLETED** - All 7 skills created and validated.
+
+## Lessons
+
+- cursor/cursor has minimal public documentation, not suitable for skill extraction
+- Some repos (cline + codex) have overlapping patterns and can be combined into one skill
+- Skills validation script confirms YAML frontmatter and basic structure