fix(gift): drop RowVersion (SQLite incompatible) + restore wire reward_type map

[Timestamp] byte[] doesn't work under SQLite (the test backend) — EF
expects the DB to populate it on insert, but SQLite has no equivalent
of Postgres's xmin. The WHERE Status = Unclaimed filter plus
IInventoryService's viewer-level concurrency is the practical defense;
RowVersion was only a backstop. Regenerated the migration without the
RowVersion column.

Wire reward_type on the gift endpoint uses a gift-specific scheme that
diverges from UserGoodsType for currencies: wire 1 = Crystal (enum=2),
wire 9 = Rupy (enum=9), wire 4 = Item (enum=4). A naked cast resolves
wire 1 to UserGoodsType.RedEther and silently grants the wrong wallet
— restored the explicit WireRewardTypeToUserGoodsType map from the old
tutorial controller.

Retrofits existing GiftControllerTests to call SeedTutorialPresentsAsync
on the new helper (RegisterViewer doesn't auto-seed; only the prod
signup path does). All 7 existing tests pass.

SVSim.Database/Migrations/20260609004113_AddViewerPresents.Designer.cs

@@ -12,7 +12,7 @@ using SVSim.Database;
 namespace SVSim.Database.Migrations
 {
     [DbContext(typeof(SVSimDbContext))]
-    [Migration("20260609003820_AddViewerPresents")]
+    [Migration("20260609004113_AddViewerPresents")]
     partial class AddViewerPresents
     {
         /// <inheritdoc />
@@ -2902,12 +2902,6 @@ namespace SVSim.Database.Migrations
                     b.Property<int>("RewardType")
                         .HasColumnType("integer");
 
-                    b.Property<byte[]>("RowVersion")
-                        .IsConcurrencyToken()
-                        .IsRequired()
-                        .ValueGeneratedOnAddOrUpdate()
-                        .HasColumnType("bytea");
-
                     b.Property<string>("Source")
                         .HasMaxLength(64)
                         .HasColumnType("character varying(64)");

SVSim.Database/Migrations/20260609004113_AddViewerPresents.cs

@@ -34,8 +34,7 @@ namespace SVSim.Database.Migrations
                     Message = table.Column<string>(type: "text", nullable: false),
                     CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
                     ClaimedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    Source = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: true),
+                    Source = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: true)
-                    RowVersion = table.Column<byte[]>(type: "bytea", rowVersion: true, nullable: false)
                 },
                 constraints: table =>
                 {

SVSim.Database/Migrations/SVSimDbContextModelSnapshot.cs

@@ -2899,12 +2899,6 @@ namespace SVSim.Database.Migrations
                     b.Property<int>("RewardType")
                         .HasColumnType("integer");
 
-                    b.Property<byte[]>("RowVersion")
-                        .IsConcurrencyToken()
-                        .IsRequired()
-                        .ValueGeneratedOnAddOrUpdate()
-                        .HasColumnType("bytea");
-
                     b.Property<string>("Source")
                         .HasMaxLength(64)
                         .HasColumnType("character varying(64)");

SVSim.Database/Models/ViewerPresent.cs

@@ -1,5 +1,3 @@
-using System.ComponentModel.DataAnnotations;
-
 namespace SVSim.Database.Models;
 
 /// <summary>
@@ -39,13 +37,6 @@ public class ViewerPresent
     /// this today — the tutorial-step advance is route-gated, not Source-gated.
     /// </summary>
     public string? Source { get; set; }
-
-    /// <summary>
-    /// EF Core optimistic concurrency for the claim path. Two concurrent claims of the
-    /// same PresentId: first wins, second's CommitAsync throws DbUpdateConcurrencyException.
-    /// </summary>
-    [Timestamp]
-    public byte[] RowVersion { get; set; } = Array.Empty<byte>();
 }
 
 public enum PresentStatus : byte

SVSim.EmulatedEntrypoint/Controllers/GiftController.cs

@@ -84,8 +84,12 @@ public class GiftController : SVSimController
         {
             if (state == 1)
             {
+                // Wire reward_type on the gift endpoint follows a gift-specific scheme that
+                // diverges from UserGoodsType for currencies: wire "1" means Crystal (enum=2),
+                // wire "9" means Rupy (enum=9), wire "4" means Item (enum=4). A naked cast would
+                // resolve wire 1 -> UserGoodsType.RedEther and silently grant the wrong wallet.
                 var granted = await tx.GrantAsync(
-                    (UserGoodsType)p.RewardType,
+                    WireRewardTypeToUserGoodsType(p.RewardType),
                     p.RewardDetailId,
                     (int)p.RewardCount);
 
@@ -161,6 +165,14 @@ public class GiftController : SVSimController
         };
     }
 
+    private static UserGoodsType WireRewardTypeToUserGoodsType(int wireType) => wireType switch
+    {
+        1 => UserGoodsType.Crystal,
+        4 => UserGoodsType.Item,
+        9 => UserGoodsType.Rupy,
+        _ => throw new InvalidOperationException($"Unmapped gift wire reward_type {wireType}"),
+    };
+
     private async Task<(List<ViewerPresent> Unclaimed, List<ViewerPresent> History)> ReadTopWindowAsync(
         long viewerId, int page)
     {

SVSim.UnitTests/Controllers/GiftControllerTests.cs

@@ -16,6 +16,7 @@ public class GiftControllerTests
     {
         using var factory = new SVSimTestFactory();
         long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var response = await client.PostAsync("/tutorial/gift_top",
@@ -54,6 +55,7 @@ public class GiftControllerTests
         using var factory = new SVSimTestFactory();
         await factory.SeedGlobalsAsync();
         long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var pre = await factory.GetViewerCurrencyAsync(viewerId);
@@ -100,6 +102,7 @@ public class GiftControllerTests
         using var factory = new SVSimTestFactory();
         await factory.SeedGlobalsAsync();
         long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var json = $$"""{"present_id_array":["71478626"],"state":1,{{BaseAuthBlock}}}""";
@@ -129,6 +132,7 @@ public class GiftControllerTests
         using var factory = new SVSimTestFactory();
         await factory.SeedGlobalsAsync();
         long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var json = $$"""{"present_id_array":["71478626","71478627"],"state":1,{{BaseAuthBlock}}}""";
@@ -167,6 +171,7 @@ public class GiftControllerTests
         // 100, not the hardcoded 41 the endpoint used to emit, or the client's tutorial
         // state machine regresses on a no-op retry.
         long viewerId = await factory.SeedViewerAsync(tutorialState: 100);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var json = $$"""{"present_id_array":["71478626"],"state":1,{{BaseAuthBlock}}}""";
@@ -192,6 +197,7 @@ public class GiftControllerTests
         // found and incremented, not duplicated. The (ViewerId, ItemId) unique index
         // added 2026-05-25 would otherwise throw on SaveChanges → 500 to the client.
         await factory.SeedOwnedItemAsync(viewerId, itemId: 1, count: 5, itemName: "PreOwnedItem");
+        await factory.SeedTutorialPresentsAsync(viewerId);
 
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
@@ -224,6 +230,7 @@ public class GiftControllerTests
         using var factory = new SVSimTestFactory();
         await factory.SeedGlobalsAsync();
         long viewerId = await factory.SeedViewerAsync(tutorialState: 31);
+        await factory.SeedTutorialPresentsAsync(viewerId);
         using var client = factory.CreateAuthenticatedClient(viewerId);
 
         var preFirst = await factory.GetViewerCurrencyAsync(viewerId);