Stable gameplay rules
- `actions` is action points per turn and `move` is standard movement range.
- `level` is treated as an ability tier and becomes `range = 2 + level` unless a direct `range` exists.
- `targeting` is narrowed to three stable values in the MVP: `0`, `3`, and `4`.
- `effect_area` still drives splash or cross masks, centered on the chosen tile.