feat(terminal): Kitty only — drop Ghostty (#95)

Ghostty's OpenGL 4.3 floor broke the Acer (HD 4000 / 4.2). Dual-terminal
support (default Ghostty + install-time Kitty fallback) was more complexity
than it was worth.

- Remove ghostty.nix / nomarchy.ghostty.enable
- Kitty always installed and themed from theme-state
- Default nomarchy.terminal = kitty; SUPER+Return, doctor, calendar,
  what-changed use kitty --class=com.nomarchy.*
- Drop install-time glxinfo probe and mesa-demos on the installer
- Docs/REQUIREMENTS no longer list OpenGL 4.3 as a terminal floor

Verified: V0 flake check; option-docs; installer-safety; template HM has
kitty, no ghostty; menu/calendar emit classed kitty launches.

tools/doctor-float.nix

@@ -1,5 +1,5 @@
 # V2 harness for the floating Doctor terminal (System › Doctor /
-# nomarchy-menu doctor → ghostty --class=com.nomarchy.doctor).
+# nomarchy-menu doctor → kitty --class=com.nomarchy.doctor).
 #
 # Boots headless softGL Hyprland (same stack as theme-shot), launches the
 # real menu path, then asserts via hyprctl that the window is floating
@@ -8,8 +8,8 @@
 #
 #   nix build --impure -f tools/doctor-float.nix --no-link --print-out-paths
 #
-# Maintainer harness — not a checks.* gate (full desktop VM). Ghostty
-# under softGL is best-effort (MEMORY); if the client never appears the
+# Maintainer harness — not a checks.* gate (full desktop VM). Kitty under
+# softGL is best-effort (MEMORY); if the client never appears the
 # scripted float asserts fail loudly rather than claiming success.
 let
   flake = builtins.getFlake ("git+file://" + toString ../.);
@@ -82,7 +82,7 @@ pkgs.testers.runNixOSTest {
     # Real product path: Waybar / System › Doctor both call this.
     machine.execute(f"{hy} dispatch exec nomarchy-menu doctor' >/dev/null 2>&1")
 
-    # Wait for the classed Ghostty client (softGL may be slow).
+    # Wait for the classed Kitty client (softGL may be slow).
     def clients():
         raw = machine.succeed(f"{hy} clients -j'").strip()
         try:
@@ -104,17 +104,15 @@ pkgs.testers.runNixOSTest {
     dump = machine.succeed(f"{hy} clients -j'")
     assert doctor is not None, (
         "no client with class com.nomarchy.doctor after nomarchy-menu doctor "
-        f"(Ghostty under softGL may have failed — clients dump):\n{dump}"
+        f"(Kitty under softGL may have failed — clients dump):\n{dump}"
     )
 
     assert doctor.get("floating") is True, (
         f"doctor window is not floating: {json.dumps(doctor, indent=2)}"
     )
 
-    # Product contract: float + center. Ghostty often keeps its default
-    # 800×600 even when a size rule is present (client geometry wins);
-    # the size rule remains as a best-effort hint. Assert center from
-    # the actual size so a smaller Ghostty window still counts.
+    # Product contract: float + center. Size rule is best-effort if the
+    # client geometry wins; assert center from the actual size.
     at = doctor.get("at") or [0, 0]
     size = doctor.get("size") or [0, 0]
     w, h = int(size[0]), int(size[1])

tools/test-live-iso.sh

@@ -39,7 +39,7 @@ ACCEL_ARG=()
 
 echo "Launching ISO: $ISO"
 # virtio-vga-gl + gl=on gives the guest real OpenGL — Hyprland and
-# Ghostty need it; without GL the session may fail to start.
+# the session needs it; without GL Hyprland may fail to start.
 exec qemu-system-x86_64 \
     "${ACCEL_ARG[@]}" \
     -m 4096 -smp 2 \

tools/theme-shot.nix

@@ -1,7 +1,7 @@
 # Themed-desktop capture harness (item 28 slice c) — boots the full
 # desktop headlessly (software-GL Hyprland) at 1920x1080 and QMP-dumps
 # screenshots into $out: desktop.png, menu.png (rofi root open), and
-# btop.png (Ghostty running btop, when the terminal starts under softGL).
+# btop.png (Kitty running btop, when the terminal starts under softGL).
 # Also asserts nomarchy-doctor-status JSON (class:bad) — the harness
 # seeds an untracked theme-state.json, so doctor always reports ✖.
 # Maintainer tool, NOT a checks.* gate (a full-desktop VM is far too
@@ -91,13 +91,13 @@ pkgs.testers.runNixOSTest {
     machine.execute(hy + " exec nomarchy-menu' >/dev/null 2>&1")
     machine.sleep(8)
     machine.screenshot("menu")
-    # Close menu, launch btop in Ghostty for the per-theme btop.theme shot.
-    # softGL may fail to start Ghostty — btop.png is best-effort then; the
+    # Close menu, launch btop in Kitty for the per-theme btop.theme shot.
+    # softGL may still fail to start a GPU terminal — btop.png is best-effort;
     # file assertions above still prove the theme is baked into the guest.
     machine.execute("su - nomarchy -c 'pkill -x rofi' >/dev/null 2>&1 || true")
     machine.sleep(1)
     machine.execute(
-      hy + " exec ghostty --gtk-single-instance=false -e btop' >/dev/null 2>&1"
+      hy + " exec kitty -e btop' >/dev/null 2>&1"
     )
     machine.sleep(12)
     machine.screenshot("btop")