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/java/communication/callingserver/SKILL.md

@@ -0,0 +1,91 @@
+---
+name: azure-communication-callingserver-java
+description: Azure Communication Services CallingServer (legacy) Java SDK. Note - This SDK is deprecated. Use azure-communication-callautomation instead for new projects. Only use this skill when maintaining legacy code.
+package: com.azure:azure-communication-callingserver
+---
+
+# Azure Communication CallingServer (Java) - DEPRECATED
+
+> **⚠️ DEPRECATED**: This SDK has been renamed to **Call Automation**. For new projects, use `azure-communication-callautomation` instead. This skill is for maintaining legacy code only.
+
+## Migration to Call Automation
+
+```xml
+<!-- OLD (deprecated) -->
+<dependency>
+    <groupId>com.azure</groupId>
+    <artifactId>azure-communication-callingserver</artifactId>
+    <version>1.0.0-beta.5</version>
+</dependency>
+
+<!-- NEW (use this instead) -->
+<dependency>
+    <groupId>com.azure</groupId>
+    <artifactId>azure-communication-callautomation</artifactId>
+    <version>1.6.0</version>
+</dependency>
+```
+
+## Class Name Changes
+
+| CallingServer (Old) | Call Automation (New) |
+|---------------------|----------------------|
+| `CallingServerClient` | `CallAutomationClient` |
+| `CallingServerClientBuilder` | `CallAutomationClientBuilder` |
+| `CallConnection` | `CallConnection` (same) |
+| `ServerCall` | Removed - use `CallConnection` |
+
+## Legacy Client Creation
+
+```java
+// OLD WAY (deprecated)
+import com.azure.communication.callingserver.CallingServerClient;
+import com.azure.communication.callingserver.CallingServerClientBuilder;
+
+CallingServerClient client = new CallingServerClientBuilder()
+    .connectionString("<connection-string>")
+    .buildClient();
+
+// NEW WAY
+import com.azure.communication.callautomation.CallAutomationClient;
+import com.azure.communication.callautomation.CallAutomationClientBuilder;
+
+CallAutomationClient client = new CallAutomationClientBuilder()
+    .connectionString("<connection-string>")
+    .buildClient();
+```
+
+## Legacy Recording
+
+```java
+// OLD WAY
+StartRecordingOptions options = new StartRecordingOptions(serverCallId)
+    .setRecordingStateCallbackUri(callbackUri);
+
+StartCallRecordingResult result = client.startRecording(options);
+String recordingId = result.getRecordingId();
+
+client.pauseRecording(recordingId);
+client.resumeRecording(recordingId);
+client.stopRecording(recordingId);
+
+// NEW WAY - see azure-communication-callautomation skill
+```
+
+## For New Development
+
+**Do not use this SDK for new projects.** 
+
+See the `azure-communication-callautomation-java` skill for:
+- Making outbound calls
+- Answering incoming calls
+- Call recording
+- DTMF recognition
+- Text-to-speech / speech-to-text
+- Adding/removing participants
+- Call transfer
+
+## Trigger Phrases
+
+- "callingserver legacy", "deprecated calling SDK"
+- "migrate callingserver to callautomation"