refactor: replace yukifoo references with official Exafunction repository

[MariaChrysafis]

Refactor: Integrate TypeScript SDK via Node.js Bridge

Summary

This PR replaces the CLI-based architecture with direct TypeScript SDK integration through a Node.js bridge. Instead of spawning Claude CLI processes, the Go SDK now communicates with a custom Node.js bridge script that wraps the official @anthropic-ai/claude-code TypeScript SDK.

Key Changes:

• New Architecture: Created bridge/claude-bridge.js that wraps the TypeScript SDK
• Communication Protocol: Changed from CLI arguments to JSON over stdin/stdout
• Option Mapping: Implemented Go options → TypeScript SDK options translation
• Maintained API: All existing Go API methods remain unchanged for backward compatibility
• Updated Dependencies: Now requires Node.js 18+ alongside the TypeScript SDK
• Module Path: Updated from yukifoo/claude-code-sdk-go to Exafunction/claude-code-sdk-go

The bridge script handles both streaming and non-streaming modes, maps all configuration options, and provides comprehensive error handling with stack traces.

Review & Testing Checklist for Human

⚠️ HIGH RISK - Major architectural change requiring thorough testing

• End-to-end testing: Test with real Anthropic API credentials to verify the bridge works correctly
• Option mapping verification: Test various Go Options configurations to ensure they're properly translated to TypeScript SDK options
• Streaming mode testing: Verify both Query() and QueryStream() work correctly with the new bridge
• Error handling: Test error scenarios (invalid options, network issues, API errors) to ensure proper error propagation
• Bridge installation: Verify the setup process (cd bridge && npm install) works in clean environments

Test Plan Recommendation

1. Set up environment with Node.js 18+ and run cd bridge && npm install
2. Configure Anthropic API key and test basic queries
3. Test streaming responses with QueryStream()
4. Test various Options configurations (tools, MCP, permissions, etc.)
5. Test error scenarios (invalid API key, network issues)

Notes

• Integration test currently fails due to missing API authentication, which is expected in CI
• Large node_modules/ directory committed - consider using .gitignore for production
• ES modules require Node.js 18+ (specified in package.json engines)
• All existing Go API surface maintained for backward compatibility

Session: https://app.devin.ai/sessions/d0cf3915c88d47a8819123a102cc48ca
Requested by: @MariaChrysafis

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