feat: initial commit of public agent skills

.gitignore

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+# OS / Editor Files
+.DS_Store
+Thumbs.db
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
+
+# Local Environment & Secrets
+.env
+.env.*
+!.env.example
+*.local
+*.secret
+*.token
+*.key
+*.pem
+credentials.json
+secrets/
+
+# Temporary / Log files
+*.log
+tmp/
+temp/

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.

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}