- vterm_open shows an error dialog when the command cannot start,
instead of a tab that silently vanishes
- on_text_command hands paste straight to vterm_paste_text;
VtermPasteCommand only forwarded
- VtermCloseCommand was bound nowhere; closing the tab already kills
the process
- wheel_lines fallback matches the shipped 1; README said three
- Architecture.md: per-theme scheme files and managers, command table
