feat: sync all 140 Microsoft skills with collision protection

- Add find_github_skills() to discover skills in .github/skills/ not
  reachable via the skills/ symlink tree (picks up 11 missing skills)
- Add collision protection: if a target directory exists and was not
  from a previous Microsoft sync, append -ms suffix instead of overwriting
- Microsoft mcp-builder → mcp-builder-ms (community version preserved)
- Microsoft skill-creator → skill-creator-ms (community version preserved)
- Total skills: 856 (was 845, +11 newly discovered)

README.md

@@ -1,6 +1,6 @@
-# 🌌 Antigravity Awesome Skills: 845+ Agentic Skills for Claude Code, Gemini CLI, Cursor, Copilot & More
+# 🌌 Antigravity Awesome Skills: 856+ Agentic Skills for Claude Code, Gemini CLI, Cursor, Copilot & More
 
-> **The Ultimate Collection of 845+ Universal Agentic Skills for AI Coding Assistants — Claude Code, Gemini CLI, Codex CLI, Antigravity IDE, GitHub Copilot, Cursor, OpenCode, AdaL**
+> **The Ultimate Collection of 856+ Universal Agentic Skills for AI Coding Assistants — Claude Code, Gemini CLI, Codex CLI, Antigravity IDE, GitHub Copilot, Cursor, OpenCode, AdaL**
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Claude Code](https://img.shields.io/badge/Claude%20Code-Anthropic-purple)](https://claude.ai)
@@ -16,7 +16,7 @@
 
 If this project helps you, you can [support it here](https://buymeacoffee.com/sickn33) or simply ⭐ the repo.
 
-**Antigravity Awesome Skills** is a curated, battle-tested library of **845 high-performance agentic skills** designed to work seamlessly across all major AI coding assistants:
+**Antigravity Awesome Skills** is a curated, battle-tested library of **856 high-performance agentic skills** designed to work seamlessly across all major AI coding assistants:
 
 - 🟣 **Claude Code** (Anthropic CLI)
 - 🔵 **Gemini CLI** (Google DeepMind)
@@ -38,7 +38,7 @@ This repository provides essential skills to transform your AI assistant into a
 - [🎁 Curated Collections (Bundles)](#curated-collections)
 - [🧭 Antigravity Workflows](#antigravity-workflows)
 - [📦 Features & Categories](#features--categories)
-- [📚 Browse 845+ Skills](#browse-845-skills)
+- [📚 Browse 856+ Skills](#browse-856-skills)
 - [🤝 How to Contribute](#how-to-contribute)
 - [🤝 Community](#community)
 - [☕ Support the Project](#support-the-project)
@@ -280,7 +280,7 @@ The repository is organized into specialized domains to transform your AI into a
 
 Counts change as new skills are added. For the current full registry, see [CATALOG.md](CATALOG.md).
 
-## Browse 845+ Skills
+## Browse 856+ Skills
 
 We have moved the full skill registry to a dedicated catalog to keep this README clean.