- Add returns_result = true to HttpServerBox methods (start, stop, accept)
- Update all E2E tests to use .get_value() for Result handling
- Prepare for gradual Result-based error handling migration
This implements the first phase of ChatGPT5's Result正規化 design,
starting with network-related methods as agreed.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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