- New keymaps::RU: 53-entry Cyrillic layout (ЙЦУКЕН/GOST).
- Extends KeymapKind enum with RU variant (value 6).
- From<usize> clamp returns US for any out-of-range value.
- Display/FromStr parse 'ru' to KeymapKind::RU.
- KeymapData::new dispatches to the RU table.
- Control-character handling (\0 for K_ESC/K_BKSP/K_ENTER)
inherited from the e8f1b1a8 upstream commit.
Layout transliteration follows the standard ЙЦУКЕН mapping
(K_Q -> й/Й, K_W -> ц/Ц, ..., K_DOT -> ./,). Shift produces
uppercase Cyrillic. Backslash/pipe key is shared with US at
K_BACKSLASH. Per Linux 7.x drivers/tty/vt/keymap.c Russian
table conventions.
Red Bear OS
75f5480f84