test(vehicle): add -reversetest and record the reverse is wheel-spin, not throttle

-reversetest holds negative throttle; forward throttle drives -224.9 km/h and reverse
throttle -99.5 km/h, both backward, so the throttle sign is not the cause - the wheel
spin is inverted relative to the engine torque. Mesh orientation is fine (nose +X).
Next: check the imported wheel-bone reference pose (axle may land on X/Z, not Y).

MEMORY.md

@@ -1048,3 +1048,15 @@ Historical task context from 2026-11-09/10; later vehicle findings above may sup
   X, not the bone's Y), the engine torque sign, or the throttle sign. Next probe: run the
   `-drivetest` with `SetThrottleInput(-1.0)` to split "throttle inverted" from "wheel spin
   inverted" in one run.
+
+## 2026-11-10 — Vehicle reverse: both throttle signs drive backward
+
+- `-reversetest` (negative throttle) shows the throttle sign is not the cause: forward
+  throttle → −224.9 km/h, reverse throttle → −99.5 km/h — **both backward**, so the wheel
+  spin is inverted relative to the engine torque, not the input mapping.
+- The mesh orientation is fine (imported bounds 476 × 228 cm, nose at +X). The earlier axle
+  flip (inward→outward) was a no-op, so the next check is the **imported wheel-bone
+  reference pose**: the axle (bone Y) may be landing on Unreal X or Z, not Y, so the wheel
+  spins about the wrong axis. `FPhysicsAssetUtils`-style body setup is not the cause either
+  (physics already simulates).
+- Kept `-reversetest` in the drive test as the diagnostic for this.