Run Re-Do

Assets/_Project/Scripts/Simulation/Meta/MetaSpendRequest.cs

@@ -0,0 +1,18 @@
+using Unity.NetCode;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Client → server permanent meta-upgrade purchase: <see cref="UpgradeId"/> keys the baked meta catalog. The
+    /// TIER is SERVER-COMPUTED (a purchase always buys owned+1) — putting a tier on the wire would invite
+    /// desync/cheat. Server-validated (<c>RunInfo.Lifecycle==Staging</c> phase gate, class mask, prereq, MaxTier,
+    /// Aether affordability) with DR-014 in-loop ledger atomicity so two same-tick purchases on barely-enough Aether
+    /// cannot both pass. UNCONDITIONAL wire type. Declared at Step 3 (wire front-load); consumed by
+    /// <c>MetaSpendSystem</c> from Step 13.
+    /// </summary>
+    public struct MetaSpendRequest : IRpcCommand
+    {
+        /// <summary>Meta-catalog upgrade id (append-only key).</summary>
+        public byte UpgradeId;
+    }
+}