feat: enhance chat tool discovery for collaborative thinking

- Update chat tool description to emphasize collaborative thinking capabilities
- Add explicit triggers for brainstorming and sharing ideas with Gemini
- Enhance prompt parameter description to include "current thinking"
- Update README to highlight chat as a thinking partner
- Update MCP_DISCOVERY.md with current tool names and enhanced examples
- Bump version to 2.5.0

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

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

setup.py

@@ -14,7 +14,7 @@ if readme_path.exists():
 
 setup(
     name="gemini-mcp-server",
-    version="2.3.0",
+    version="2.5.0",
     description="Model Context Protocol server for Google Gemini",
     long_description=long_description,
     long_description_content_type="text/markdown",