feat: Add Official Microsoft & Gemini Skills (845+ Total)

🚀 Impact

Significantly expands the capabilities of **Antigravity Awesome Skills** by integrating official skill collections from **Microsoft** and **Google Gemini**. This update increases the total skill count to **845+**, making the library even more comprehensive for AI coding assistants.

✨ Key Changes

1. New Official Skills

- **Microsoft Skills**: Added a massive collection of official skills from [microsoft/skills](https://github.com/microsoft/skills).
  - Includes Azure, .NET, Python, TypeScript, and Semantic Kernel skills.
  - Preserves the original directory structure under `skills/official/microsoft/`.
  - Includes plugin skills from the `.github/plugins` directory.
- **Gemini Skills**: Added official Gemini API development skills under `skills/gemini-api-dev/`.

2. New Scripts & Tooling

- **`scripts/sync_microsoft_skills.py`**: A robust synchronization script that:
  - Clones the official Microsoft repository.
  - Preserves the original directory heirarchy.
  - Handles symlinks and plugin locations.
  - Generates attribution metadata.
- **`scripts/tests/inspect_microsoft_repo.py`**: Debug tool to inspect the remote repository structure.
- **`scripts/tests/test_comprehensive_coverage.py`**: Verification script to ensure 100% of skills are captured during sync.

3. Core Improvements

- **`scripts/generate_index.py`**: Enhanced frontmatter parsing to safely handle unquoted values containing `@` symbols and commas (fixing issues with some Microsoft skill descriptions).
- **`package.json`**: Added `sync:microsoft` and `sync:all-official` scripts for easy maintenance.

4. Documentation

- Updated `README.md` to reflect the new skill counts (845+) and added Microsoft/Gemini to the provider list.
- Updated `CATALOG.md` and `skills_index.json` with the new skills.

🧪 Verification

- Ran `scripts/tests/test_comprehensive_coverage.py` to verify all Microsoft skills are detected.
- Validated `generate_index.py` fixes by successfully indexing the new skills.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "antigravity-awesome-skills",
   "version": "5.0.0",
-  "description": "626+ agentic skills for Claude Code, Gemini CLI, Cursor, Antigravity & more. Installer CLI.",
+  "description": "800+ agentic skills for Claude Code, Gemini CLI, Cursor, Antigravity & more. Installer CLI.",
   "license": "MIT",
   "scripts": {
     "validate": "python3 scripts/validate_skills.py",
@@ -11,7 +11,9 @@
     "chain": "npm run validate && npm run index && npm run readme",
     "catalog": "node scripts/build-catalog.js",
     "build": "npm run chain && npm run catalog",
-    "test": "node scripts/tests/validate_skills_headings.test.js && python3 scripts/tests/test_validate_skills_headings.py"
+    "test": "node scripts/tests/validate_skills_headings.test.js && python3 scripts/tests/test_validate_skills_headings.py && python3 scripts/tests/inspect_microsoft_repo.py && python3 scripts/tests/test_comprehensive_coverage.py",
+    "sync:microsoft": "python3 scripts/sync_microsoft_skills.py",
+    "sync:all-official": "npm run sync:microsoft && npm run chain"
   },
   "devDependencies": {
     "yaml": "^2.8.2"