Chosen action: MoveRight
Reasoning: Step 0, agent 0. I'm at position (-4, 1.5) facing forward (0°). The map shows I'm in a corridor on the left side of the room. My teammate (agent 1) is directly behind me at z=2.5. I need to divide the map and move towards uncovered areas away from my teammate. Looking at the action hints: MoveBack goes to [-16,5] which is uncovered with 6 new cells and improves frontier distance. MoveLeft goes to [-17,6] uncovered with 3 new cells. MoveRight goes to [-15,6] uncovered with 5 new cells. RotateLeft would face 270° (west) with 12 estimated new cells but doesn't improve frontier. Since my teammate is behind me (north), I should move away from them. MoveRight takes me east toward the right side of the room, away from agent 1, with 5 new uncovered cells and improves frontier distance. This divides the space effectively - I go right while my teammate can explore the upper/corridor area.