implement cost formula for asteroid expansion

src/lib/sim/Simulation.h

@@ -72,6 +72,12 @@ public:
     // The seed this run was (re)initialized with; written to the replay header.
     unsigned int getSeed()        const;
     int    buildingBlocksStock()  const;
+    // Current asteroid width in tiles = base width + purchased expansions
+    // (REQ-EXP-UNLOCK, REQ-GW-ASTEROID-EXPAND).
+    int    currentAsteroidWidth_tiles() const;
+    // Building block cost of the next expansion, floored to an integer
+    // (REQ-EXP-COST); x = number of expansions already purchased.
+    int    currentExpansionCost()  const;
     bool   isGameOver()           const;
     bool   isWon()                const;
     int    artifactCount()        const;
@@ -136,6 +142,11 @@ private:
     // Clears the pending choices after application.
     void applySchematicChoice(int choiceIndex);
 
+    // Unlocks one asteroid expansion if affordable (REQ-EXP-UNLOCK): checks the
+    // current cost against the stock, deducts it, increments the expansion
+    // counter, and widens the buildable asteroid. No-op if blocks are short.
+    void tryExpandAsteroid();
+
     // Mutable subsystem accessors; same chokepoint rule as the mutators above.
     BuildingSystem&       buildingsMutable();
     BeltSystem&           beltsMutable();
@@ -165,6 +176,7 @@ private:
     Tick     m_nextDepartureTick;
     BuildingId m_nextBuildingId;
     int      m_buildingBlocksStock;
+    int      m_expansionsPurchased = 0;  // REQ-EXP-COST formula variable x
     bool     m_gameOver    = false;
     bool     m_isWon       = false;
     int      m_artifactCount = 0;