implement waves

src/lib/sim/BuildingSystem.h

@@ -71,6 +71,27 @@ public:
     // Increase a building's HP by amount, clamped to maxHp.
     void healBuilding(EntityId id, float amount);
 
+    // Reduce a building's HP by amount; hp may go below 0 (step 9 processes deaths).
+    void damageBuilding(EntityId id, float amount);
+
+    // Bypass the construction queue and create a fully-operational Building
+    // immediately. Used for pre-placed structures (HQ, defence stations).
+    // surfaceMask comes from the relevant config struct.
+    EntityId placeImmediate(BuildingType type,
+                            const std::vector<std::string>& surfaceMask,
+                            QPoint anchor, Rotation rotation,
+                            float hp, float maxHp);
+
+    // Remove an operational building by id without refund (used for deaths).
+    // Returns true if found and removed.
+    bool removeBuilding(EntityId id);
+
+    // Set the weapon component on an already-placed defence station.
+    void initStationWeapon(EntityId id, const StationWeapon& weapon);
+
+    // Mutable iteration over all operational buildings (used by CombatSystem).
+    void forEachBuilding(std::function<void(Building&)> fn);
+
 private:
     struct BeltEntry
     {