Check for available aircraft as task precondition.

This makes it so that the mission planning effects are applied only if
the package can be fulfilled. For example, breakthrough will be used
only if all the BAI missions were fulfilled, not if they will *attempt*
to be fulfilled.

game/commander/tasks/theatercommandertask.py

@@ -5,16 +5,12 @@ from typing import TYPE_CHECKING
 
 from game.commander.theaterstate import TheaterState
 from game.htn import PrimitiveTask
-from game.profiling import MultiEventTracer
 
 if TYPE_CHECKING:
-    from gen.flights.ai_flight_planner import CoalitionMissionPlanner
+    from game.coalition import Coalition
 
 
-# TODO: Refactor so that we don't need to call up to the mission planner.
 class TheaterCommanderTask(PrimitiveTask[TheaterState]):
     @abstractmethod
-    def execute(
-        self, mission_planner: CoalitionMissionPlanner, tracer: MultiEventTracer
-    ) -> None:
+    def execute(self, coalition: Coalition) -> None:
         ...