fix(guild_chat): wait_interval as raw int + capture-replay request field name

Remove StringifiedIntConverter from GuildChatMessagesResponse.WaitInterval so the
wire emits a raw JSON number (3) matching prod, not a quoted string ("3").
Update GuildChatPollTests (2 assertions) and GuildCaptureReplayTests (1 assertion +
comment) to expect JsonValueKind.Number. Fix last_message_id → start_message_id typo
in GuildChatMessages_Member_ReturnsProdShape request body.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/GuildChat/GuildChatMessagesResponse.cs

@@ -1,6 +1,5 @@
 using MessagePack;
 using System.Text.Json.Serialization;
-using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Common.Guild;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.GuildChat;
@@ -25,7 +24,7 @@ public class GuildChatMessagesResponse
     public List<ChatMessageDto> ChatMessage { get; set; } = new();
 
     /// <summary>Server-driven polling interval in seconds. Client uses this for the next poll.</summary>
-    [JsonPropertyName("wait_interval"), Key("wait_interval"), JsonConverter(typeof(StringifiedIntConverter)),
+    [JsonPropertyName("wait_interval"), Key("wait_interval"),
      JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public int WaitInterval { get; set; }
 }

SVSim.UnitTests/Integration/Guild/GuildCaptureReplayTests.cs

@@ -215,11 +215,11 @@ public class GuildCaptureReplayTests
         Assert.That(createResp.IsSuccessStatusCode, Is.True,
             $"guild/create failed: {await createResp.Content.ReadAsStringAsync()}");
 
-        // Poll messages — last_message_id=0 means "give me everything"
+        // Poll messages — start_message_id=0 means "give me everything"
         var resp = await client.PostAsync("/guild_chat/messages",
             JsonContent.Create(new
             {
-                last_message_id = 0,
+                start_message_id = 0,
                 viewer_id = Vid, steam_id = Sid, steam_session_ticket = Stk,
             }));
 
@@ -236,17 +236,12 @@ public class GuildCaptureReplayTests
         Assert.That(chatArr.ValueKind, Is.EqualTo(JsonValueKind.Array),
             "'chat_message' must be a JSON array");
 
-        // wait_interval must be present and parse to a positive integer.
-        // Prod ships it as a raw JSON number (3); our server uses StringifiedIntConverter
-        // so it emits a quoted string ("3"). We accept either form here to avoid a
-        // broader DTO change that would require updating all existing GuildChatPollTests.
+        // wait_interval must be a raw JSON number matching prod (prod sends 3, not "3").
         Assert.That(root.TryGetProperty("wait_interval", out var waitEl), Is.True,
             "Response must have 'wait_interval' field");
-        int waitValue = waitEl.ValueKind == JsonValueKind.Number
-            ? waitEl.GetInt32()
-            : int.Parse(waitEl.GetString()!);
-        Assert.That(waitValue, Is.GreaterThan(0),
-            "'wait_interval' must be positive");
+        Assert.That(waitEl.ValueKind, Is.EqualTo(JsonValueKind.Number),
+            "'wait_interval' must be a raw JSON number (prod sends 3, not \"3\")");
+        Assert.That(waitEl.GetInt32(), Is.GreaterThan(0), "'wait_interval' must be positive");
 
         // maintenance_card_list must be present as array
         Assert.That(root.TryGetProperty("maintenance_card_list", out var maintArr), Is.True,

SVSim.UnitTests/Integration/Guild/GuildChatPollTests.cs

@@ -330,9 +330,12 @@ public class GuildChatPollTests
         Assert.That(messages.GetArrayLength(), Is.EqualTo(0),
             "chat_message must be empty for a viewer not in a guild");
 
-        // wait_interval is stringified; idle default is ChatPollIdleSeconds (10)
-        int waitInterval = GetStringifiedInt(root, "wait_interval");
-        Assert.That(waitInterval, Is.GreaterThan(0), "wait_interval must be positive");
+        // wait_interval is a raw JSON number; idle default is ChatPollIdleSeconds (10)
+        Assert.That(root.TryGetProperty("wait_interval", out var waitEl), Is.True,
+            "Response must have 'wait_interval' field");
+        Assert.That(waitEl.ValueKind, Is.EqualTo(JsonValueKind.Number),
+            "'wait_interval' must be a raw JSON number (prod sends 3, not \"3\")");
+        Assert.That(waitEl.GetInt32(), Is.GreaterThan(0), "wait_interval must be positive");
     }
 
     // =========================================================================
@@ -354,11 +357,11 @@ public class GuildChatPollTests
 
         // Leader gets messages → active interval
         var activePoll = await PollAsync(leaderClient, startMessageId: 0, direction: 1);
-        int activeWait = GetStringifiedInt(activePoll, "wait_interval");
+        int activeWait = activePoll.GetProperty("wait_interval").GetInt32();
 
         // Lonely viewer not in a guild → idle interval
         var idlePoll = await PollAsync(lonelyClient, startMessageId: 0, direction: 1);
-        int idleWait = GetStringifiedInt(idlePoll, "wait_interval");
+        int idleWait = idlePoll.GetProperty("wait_interval").GetInt32();
 
         Assert.That(activeWait, Is.LessThan(idleWait),
             $"Active interval ({activeWait}s) must be less than idle interval ({idleWait}s)");