debug: Add extensive logging for unit movement bug investigation

- Log when move_unit command is received
- Log unit IDs and targets being set
- Log actual movement with positions
- Log when units reach destination
- Added DEBUG_MOVEMENT_BUG.md with investigation guide

app.py

@@ -676,11 +676,17 @@ class ConnectionManager:
                 dist = (dx*dx + dy*dy) ** 0.5
                 
                 if dist > 5:
+                    old_x, old_y = unit.position.x, unit.position.y
                     unit.position.x += (dx / dist) * unit.speed
                     unit.position.y += (dy / dist) * unit.speed
                     # Apply dispersion after movement
                     self.apply_unit_dispersion(unit)
+                    
+                    # Debug log for movement (only log occasionally to avoid spam)
+                    if self.game_state.tick % 20 == 0:  # Every second (20 ticks/sec)
+                        print(f"   🚶 Unit {unit.id} ({unit.type}) moving: ({old_x:.1f},{old_y:.1f}) -> ({unit.position.x:.1f},{unit.position.y:.1f}), dist={dist:.1f}")
                 else:
+                    print(f"   ✅ Unit {unit.id} ({unit.type}) reached destination ({unit.position.x:.1f},{unit.position.y:.1f})")
                     unit.target = None
                     unit.manual_order = False  # Clear manual order flag when destination reached
                     # If Harvester reached manual destination, resume AI
@@ -1133,16 +1139,20 @@ class ConnectionManager:
         if cmd_type == "move_unit":
             unit_ids = command.get("unit_ids", [])
             target = command.get("target")
+            print(f"🎮 MOVE_UNIT command received: unit_ids={unit_ids}, target={target}")
             if target and "x" in target and "y" in target:
                 base_target = Position(target["x"], target["y"])
+                print(f"   Moving to position ({base_target.x:.1f}, {base_target.y:.1f})")
                 
                 # If multiple units, spread them in a formation
                 if len(unit_ids) > 1:
+                    print(f"   Setting formation for {len(unit_ids)} units")
                     # Formation pattern: circular spread around target
                     radius = 30.0  # Distance between units in formation
                     for idx, uid in enumerate(unit_ids):
                         if uid in self.game_state.units:
                             unit = self.game_state.units[uid]
+                            print(f"     Unit {uid} ({unit.type}) - setting target")
                             
                             # Calculate offset position in circular formation
                             angle = (idx * 360.0 / len(unit_ids)) * (3.14159 / 180.0)
@@ -1167,9 +1177,11 @@ class ConnectionManager:
                                 unit.ore_target = None
                 else:
                     # Single unit - move to exact target
+                    print(f"   Setting single unit target")
                     for uid in unit_ids:
                         if uid in self.game_state.units:
                             unit = self.game_state.units[uid]
+                            print(f"     Unit {uid} ({unit.type}) at ({unit.position.x:.1f},{unit.position.y:.1f}) -> ({base_target.x:.1f},{base_target.y:.1f})")
                             unit.target = base_target
                             
                             # FIX: Clear combat target and set manual order flag