feat: initial commit of public agent skills

README.md

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+# Public Agent & Antigravity Skills
+
+A collection of public, reusable agent skills, cheatsheets, and operational workflows for AI coding assistants and automation agents.
+
+---
+
+## 📂 Skills Index
+
+*(Public skills will be added here as generic, open workflows)*
+
+---
+
+## 🛠️ Usage
+
+To use these skills with Antigravity:
+1. Clone or symlink desired skills into your project's `.agents/skills/` or global `~/.gemini/config/skills/`.
+2. The agent will discover them automatically through progressive disclosure.