Rename: Tokyo Wangan Racing (was Fast & Furious: Tokyo Expressway)

- Title in README + GDD, UI/log prefixes FnF -> Wangan
- Rojo project name -> TokyoWanganRacing
- Fix undefined `H` in CarManager seat CFrame (selene error) -> Chassis.BODY_SIZE.Y

src/server/CarManager.luau

@@ -223,7 +223,10 @@ local function buildCarModel(car: Car, tuning: Tuning): Model
 	seat.HeadsUpDisplay = false
 	seat.CanCollide = false
 	seat.Color = Color3.new(0.1, 0.1, 0.1)
-	seat.CFrame = origin * CFrame.new(0, 1.2, -0.5)
+	-- Seat pan just above the body slab (top = H/2): low enough to look tucked
+	-- in the cabin, high enough that the avatar's legs never interpenetrate
+	-- the slab (which causes physics launches).
+	seat.CFrame = origin * CFrame.new(0, Chassis.BODY_SIZE.Y / 2 + 0.3, 0.2)
 	seat.Parent = model
 	local seatWeld = Instance.new("WeldConstraint")
 	seatWeld.Part0 = body