Update README: rename "Run (Windows dev)" to "Run (dev)", add a Linux (Ubuntu/Debian) prerequisites section with required apt packages and instructions to install Node/Rust and run dev, and clarify the Linux VM build step. Tweak src-tauri/src/main.rs to scope the windows_subsystem attribute to only non-debug Windows builds (add target_os = "windows" to the cfg_attr) to avoid extra console windows in release builds on Windows.
Initialize the Nebula OS Tauri project: add frontend (src/) with HTML, JS, CSS and SVG assets, plus a sample greet UI. Add src-tauri Rust backend (Cargo.toml, build.rs, main/lib) with a greeting command, tauri.conf.json, capability schema and platform icons. Add package.json (dev dependency on @tauri-apps/cli), .gitignore files and VSCode recommended extensions. Expand README with project vision, architecture and phase roadmap to document the Windows-first development plan.
andrew