EB-2: felt spend - turrets burn a shared Charge pool, ledger-fed Fabricator mints it from Ore

Mined Ore now has an ongoing sink: a ledger-fed Fabricator converts Ore->Charge
(1 Ore -> 3 Charge / 30t) and turrets spend Charge per shot, soft-failing (no
shot, no cooldown burn) when the shared pool runs dry.

- ResourceId.Charge=4 rides the existing [GhostField] StorageEntry ledger (no new wire).
- TurretFireSystem: single ledger resolve + atomic spend / soft-fail / partial-refund.
- Fabricator.InputFromLedger (byte, server-only) feeds input from the shared ledger,
  read live in-loop so two machines split a finite pool; both modes deposit to ledger.
- HudSystem: violet Charge chip + global quiet-turret cue when siege && Charge==0.
- StorageMath.TotalOf backs the affordability read; catalog re-enables the Fabricator (4 entries).

See DR-033.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/_Project/Scripts/Simulation/HomeBase/StorageMath.cs

@@ -58,5 +58,18 @@ namespace ProjectM.Simulation
 
             return 0;
         }
+
+        /// <summary>Total count of <paramref name="itemId"/> across the buffer (0 if absent / itemId 0). EB-2 ledger
+        /// affordability read; mirrors MachineSlotMath.TotalOf. Pure, non-generic, Burst-safe.</summary>
+        public static int TotalOf(DynamicBuffer<StorageEntry> buffer, ushort itemId)
+        {
+            if (itemId == 0)
+                return 0;
+            int total = 0;
+            for (int i = 0; i < buffer.Length; i++)
+                if (buffer[i].ItemId == itemId)
+                    total += buffer[i].Count;
+            return total;
+        }
     }
 }