fix: Set Gemini 2.5 Pro Preview as default and improve portability

Changes:
- Restored Gemini 2.5 Pro Preview as the default model
- Removed hardcoded paths from claude_config_example.json
- Added MCP_DISCOVERY.md explaining how Claude discovers MCP servers
- Updated README with natural language usage examples

The server now defaults to the most capable Gemini 2.5 Pro Preview model
as requested, and all paths are now relative for better portability.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -2,6 +2,15 @@
 
 A Model Context Protocol (MCP) server that enables integration with Google's Gemini models, optimized for Gemini 2.5 Pro Preview with 1M token context window.
 
+## How It Works with Claude
+
+Once configured, Claude automatically discovers this server's capabilities. You can use natural language to invoke Gemini:
+- "Ask Gemini about..."
+- "Use Gemini to analyze this file..."
+- "Have Gemini review this code..."
+
+See [MCP_DISCOVERY.md](MCP_DISCOVERY.md) for detailed information about how Claude discovers and uses MCP servers.
+
 ## Features
 
 - **Chat with Gemini**: Send prompts to Gemini 2.5 Pro Preview by default
@@ -115,7 +124,7 @@ When working with large files in Claude Code, you can use the Gemini server like
 
 ## Models
 
-The server defaults to `gemini-2.5-pro-preview-06-05` which supports:
+The server defaults to `gemini-2.5-pro-preview-06-05` (the latest and most capable model) which supports:
 - 1 million token context window
 - Advanced reasoning capabilities
 - Code understanding and analysis