hypr: add AltGr hold-to-talk dictation on rutherford

The desktop's TypeMatrix has no Copilot key, so bind the guarded
hold-start/stop scripts to bare right Alt: Alt_R is the keysym that
keycode 108 produces under us,dvorak (the Lua bind helper rejects
code:NNN). The release bind carries the ALT modifier because Alt_R is
itself Mod1 and still active while its release is processed — a
modmask-0 release bind never matches, which left the daemon stuck
recording. The se group remaps right Alt to ISO_Level3_Shift and is
left alone on purpose so AltGr combos keep working there.

hypr/hosts/rutherford.lua

@@ -7,3 +7,20 @@ hl.monitor({
     position = "0x0",
     scale    = 1,
 })
+
+-- Bare AltGr (right Alt on the TypeMatrix) is the hold-to-talk dictation key
+-- here. Raw keycode 108 (KEY_RIGHTALT) so it matches in every kb group. Press
+-- starts, release stops; the scripts guard the daemon state so stray toggles
+-- (key repeat, missed release) can't invert it (see keybindings.lua).
+-- Kept per-host so machines that use AltGr for characters aren't affected.
+-- Bare AltGr (right Alt on the TypeMatrix) is the hold-to-talk dictation key
+-- here. Alt_R is the keysym right Alt produces under us,dvorak (pc's RALT);
+-- the se group remaps it to ISO_Level3_Shift for AltGr combos and is left
+-- alone on purpose. Press = start (modmask 0: Hyprland excludes the pressed
+-- key's own modifier), release = stop (modmask ALT: Alt_R is itself Mod1 and
+-- is still active while its release event is processed, so the release bind
+-- must carry ALT to match). The scripts guard the daemon state so stray
+-- toggles (key repeat, missed release) can't invert it (see keybindings.lua).
+-- Kept per-host so machines that use AltGr aren't affected.
+hl.bind("Alt_R", hl.dsp.exec_cmd("~/.config/hypr/scripts/whisrs-hold-start.sh"))
+hl.bind("ALT + Alt_R", hl.dsp.exec_cmd("~/.config/hypr/scripts/whisrs-hold-stop.sh"), { release = true })