Release Notes:
- Rebuilt the terminal emulator with selectable QProcess or Pexpect backends, added the pexpect dependency, and removed bitsandbytes for a more reliable shell experience across platforms.
- The engagement setup dialog is now a resizable QDialog that remembers your last folder, pre-fills Chroma/Threat DB paths, and seeds the Ollama URL so you can reopen projects faster.
- Clear screen now wipes the central display area in both the main window and terminal emulator instead of injecting a shell command, keeping the UI tidy regardless of backend state.
- Hardened window lifecycle management by initializing the help window attribute and ensuring the splash/progress window closes as soon as Nebula loads.
- Updated Python compatibility to 3.11–3.13.9, refreshed dependencies/documentation, and restored the public index page.