[WIP] Milestone 1.4: Windows Support (Week 7-8)

[Copilot]

• Fix existing clippy warnings in test files
• Abstract platform-specific code into traits
• Implement Windows executor for process spawning
• Add PowerShell and CMD interpreter support
• Handle Windows path separators and environment variables
• Test on Windows CI environment
• Update documentation for Windows users

Initial analysis shows the repository already has some Windows-specific handling in src/process.rs using cfg!(target_os = "windows") to choose between cmd /C and sh -c. We need to abstract this into a proper trait-based architecture as outlined in the ROADMAP.md.

Current Windows handling:

• Basic Windows command execution using cmd /C
• Path handling in plugins (but Unix-specific separators in some areas)
• Cross-platform testing setup in integration tests

Fixes #60.

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