Additional Tool Transformation Examples for Client Wrapping

[strawgate]

Adds comprehensive documentation showing how to expose Python client methods directly as MCP tools using Tool Transformation.

This addresses the enhancement request in #1878 by adding three progressive examples demonstrating:

1. Basic client method wrapping - Shows how to wrap a GitHub client method with Tool.from_function() and Tool.from_tool()
2. Hiding client-specific arguments - Demonstrates hiding internal parameters like debug flags and auth tokens
3. Reusable argument patterns - Full example showing how to scale this pattern across multiple tools with shared transformations

This pattern eliminates boilerplate wrapper functions and treats tools as annotation layers around client methods, making it easier to:

• Keep implementation logic in the client
• Maintain consistent annotations across tools
• Scale to larger numbers of tools
• Avoid maintaining duplicate implementations

Closes #1878

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[jlowin]

This is great!