test(doctor): V2 float harness for System › Doctor

Headless softGL Hyprland harness (tools/doctor-float.nix): launches
nomarchy-menu doctor, asserts class/floating/center via hyprctl, dumps
before/after screenshots. Ran boreal + summer-night — both PASS
(floating centered sheet; Ghostty keeps ~800×600). MEMORY recipe.

Verified: V2 — THEME=boreal and THEME=summer-night doctor-float green;
screenshots viewed (desktop-before vs doctor-float under both themes).

agent/MEMORY.md

@@ -7,10 +7,17 @@ here the moment a debugging session teaches you something a future
 iteration would otherwise rediscover.
 
 ## Testing & VM recipes
+- **Doctor float V2:** `THEME=<slug> nix build --impure -f tools/doctor-float.nix`
+  — softGL Hyprland, `nomarchy-menu doctor`, asserts
+  `class=com.nomarchy.doctor` + `floating` + centered midpoints +
+  screenshots. Ghostty *does* start here under softGL (classed one-shot);
+  size often stays Ghostty’s default 800×600 (client geometry wins over
+  the percent `size` windowrule).
 - **theme-shot softGL cannot start Ghostty** — `btop.png` is best-effort
   (usually identical to desktop). Guest asserts on
   `~/.config/btop/themes/nomarchy.theme` prove baking; the TUI look is
-  hardware/GL tier (HARDWARE-QUEUE).
+  hardware/GL tier (HARDWARE-QUEUE). Doctor float is the counter-example
+  that a *classed* one-shot Ghostty can still map under softGL.
 - **Waybar `custom/doctor` tripwire:** status helper must invoke
   `nomarchy-doctor` by **absolute store path** (waybar's env can miss
   system PATH → `command -v … || exit 0` self-hides forever); empty