Migration from MCP to Direct Tool Calling

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Description

Migrate from MCP client/server architecture to direct tool calling with Claude API.

Acceptance Criteria

• Remove MCP client/server components
• Implement direct tool calling with Claude API:
  • Tool definitions in Claude API format
  • Tool handlers using GitHub API
  • Response processing without MCP
• Ensure backward compatibility with existing PR data format
• Maintain feature parity with existing implementation
• Update tests to reflect the new architecture
• Documentation updates for the architectural change

Technical Details

• Replace MCP server with direct tool implementation
• Update Claude API integration to use native tool calling
• Ensure all existing functionality is preserved
• Update test mocks and fixtures
• Document the architectural changes