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.

skills/official/microsoft/plugins/wiki-qa/SKILL.md

@@ -0,0 +1,34 @@
+---
+name: wiki-qa
+description: Answers questions about a code repository using source file analysis. Use when the user asks a question about how something works, wants to understand a component, or needs help navigating the codebase.
+---
+
+# Wiki Q&A
+
+Answer repository questions grounded entirely in source code evidence.
+
+## When to Activate
+
+- User asks a question about the codebase
+- User wants to understand a specific file, function, or component
+- User asks "how does X work" or "where is Y defined"
+
+## Procedure
+
+1. Detect the language of the question; respond in the same language
+2. Search the codebase for relevant files
+3. Read those files to gather evidence
+4. Synthesize an answer with inline citations
+
+## Response Format
+
+- Use `##` headings, code blocks with language tags, tables, bullet lists
+- Cite sources inline: `(src/path/file.ts:42)`
+- Include a "Key Files" table mapping files to their roles
+- If information is insufficient, say so and suggest files to examine
+
+## Rules
+
+- ONLY use information from actual source files
+- NEVER invent, guess, or use external knowledge
+- Think step by step before answering