Cross-platform compatibility testing

[krjordan]

Ensure reliable operation across all supported platforms.

Requirements

• Test on Linux (major distros)
• Test on macOS (Intel and Apple Silicon)
• Test on Windows 10/11
• Verify packaging for each platform
• Platform-specific feature testing

Acceptance Criteria

• Builds and runs on Ubuntu 20.04+
• Works on macOS 11+ (Intel and ARM)
• Compatible with Windows 10/11
• All features work on each platform
• Installation packages available
• Platform-specific docs updated