feat: enhance Windows UART compatibility with platform-specific handling

[wizzomafizzo]

Summary

• Add Windows-specific timeout adjustments (100ms vs 50ms) for better USB-to-serial driver compatibility
• Implement Windows post-write delay (15ms) for proper buffer flushing
• Add Windows port recovery mechanism for stuck COM port situations
• Include comprehensive Windows-specific test coverage
• Platform detection utilities for cross-platform handling

Problem Addressed

Windows USB-to-serial drivers have different timing characteristics compared to native UART or other platforms, which can cause:

• Timeout issues with standard 50ms read timeouts
• Buffer flushing problems without proper post-write delays
• COM ports getting "stuck" requiring recovery mechanisms

Solution

This PR implements platform-specific handling that:

1. Detects Windows platform and applies appropriate timing adjustments
2. Increases read timeouts from 50ms to 100ms on Windows for stability
3. Adds post-write delays to ensure proper buffer flushing on Windows
4. Provides recovery mechanisms for stuck COM port scenarios
5. Maintains compatibility with existing non-Windows behavior

Test Coverage

• Windows platform detection tests
• Timeout value verification for both Windows and non-Windows
• Post-write delay timing verification
• Port recovery mechanism validation
• Integration function testing

Research & Best Practices

Implementation follows industry best practices for Windows COM port handling:

• Timeout adjustments for Windows USB-to-serial drivers
• Buffer management with drain/retry logic
• Platform-specific timing accommodations
• Graceful error handling and recovery

The go.bug.st/serial library (v1.6.4) provides additional capabilities like SetDTR(), SetRTS(), and buffer management methods that could be leveraged for future enhancements if specific issues arise.

Test plan

• All existing tests pass
• Windows-specific tests added and passing
• Cross-platform compatibility maintained
• No breaking changes to existing API