e11eddf1b4
- room.gd: Add signal tracking and explicit cleanup in _exit_tree - room.gd: Guard _on_enemy_died against race condition after room freed - player.gd: Set _shield_ready = false on shield activation - player.gd: Fix coolant zone lambda syntax error - player.gd: Add apply_knockback() method for Hivemind pulse - player.gd: Fix coolant zone memory leak (use Timer child) - hud.gd: Remove deprecated boss bar code