`keybindings.json`

Action → array of key / mouse names. Author arrays replace the default list for that action (merge is per-action overlay).

{
  "dialogue_advance": ["Space", "Enter", "MouseLeft"],
  "dialogue_back": ["Backspace"],
  "pause": ["Escape"]
}

Usually you need

Action	Role
`dialogue_advance`	Advance / confirm
`dialogue_back`	Rollback
`pause` / `save` / `load` / `quit`	Session
`choice_1` … `choice_5`	Numbered picks
`choice_prev` / `choice_next` / `choice_cycle` / `choice_confirm`	Choice nav
`debug_*`	Debug overlay

Locale overlay: keybindings_<locale>.json. Concept: Keybindings. Save and session (dialogue_back).