lint: ruff-clean testbed (blocking file write to thread, unused vars)

testbed/tests/test_render.py

@@ -21,7 +21,7 @@ def test_wall_nearby_is_bright_gray():
     room = Room()
     room.capsule.yaw_deg = 180.0  # face north wall 1.5m away
     px = Raycaster().render(room)[0].load()
-    r, g, b = px[80, 60]
+    r, g, _b = px[80, 60]
     assert abs(r - g) < 8 and r > 80  # gray wall, little fog at 1.5m
 
 
@@ -30,11 +30,11 @@ def test_beacon_glow_visible_when_facing_it():
     room.capsule.x, room.capsule.z, room.capsule.yaw_deg = 11.0, 11.0, 45.0
     img, _ = Raycaster().render(room)
     px = img.load()
-    r, g, b = px[80, 60]
+    r, _, b = px[80, 60]
     assert b > r  # inactive beacon glows cyan
     room.beacon.active = True
     px = Raycaster().render(room)[0].load()
-    r, g, b = px[80, 60]
+    r, _, b = px[80, 60]
     assert r > b  # active beacon glows warm yellow
 
 
@@ -42,7 +42,7 @@ def test_beacon_occluded_by_crate():
     room = Room()
     # Beacon behind crate_red from spawn: center pixel must not be cyan.
     px = Raycaster().render(room)[0].load()
-    r, g, b = px[80, 60]
+    _r, _g, b = px[80, 60]
     assert b < 90