Revert test_antenna_collision.py: collision test is timing sensitive

tests/test_antenna_collision.py

@@ -7,7 +7,7 @@ so detection alignment is unambiguous.
 
 Collision setup:
   - Right antenna fixed at -0.68 rad
-  - Left antenna moves from -0.1745 to 0.70 rad (collision at ~0.60 rad)
+  - Left antenna moves from 0.0 to 0.70 rad (collision at ~0.60 rad)
   - Hold 100ms, then return to rest
   - Low PID + flexible antennas = safe, produces audible click
 
@@ -32,7 +32,7 @@ import numpy as np
 
 # Collision parameters
 RIGHT_REST = -0.68    # right antenna fixed position (rad)
-LEFT_REST = -0.1745   # left antenna rest position (rad) ~10° offset to reduce shaking
+LEFT_REST = 0.0       # left antenna rest position (rad)
 LEFT_COLLISION = 0.70 # left antenna collision target (past contact at ~0.60)
 HOLD_DURATION = 0.2   # seconds to hold at collision position