feat(net): 9 more GameEvent payload parsers

Extends GameEvents.cs with parsers for commonly-observed events that
had been routed-but-unparsed by the F.1 dispatcher:

- UseDone (0x01C7): u32 weenieError — Use/UseWithTarget completion.
- InventoryPutObjectIn3D (0x019A): u32 itemGuid — server dropped item.
- InventoryServerSaveFailed (0x00A0): u32 itemGuid — rollback signal.
- CloseGroundContainer (0x0052): u32 containerGuid.
- TradeFailure (0x0207): u32 errorCode.
- AddToTrade (0x0200): (itemGuid, slotIndex).
- AcceptTrade (0x0202): u32 initiatorGuid.
- QueryItemManaResponse (0x0264): (itemGuid, f32 manaPercent).
- CharacterConfirmationRequest (0x0274): (type, contextId, otherGuid,
  string16L message) — server-driven modal confirmations.

All defensive: return null on truncated payloads rather than throwing,
matching the existing style. Caller can keep the dispatcher alive even
on malformed events.

Build green, tests unchanged (no new tests — these are simple passthroughs).

Ref: r08 §4 payloads for each opcode.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/AcDream.Core.Net/Messages/GameEvents.cs

@@ -375,6 +375,94 @@ public static class GameEvents
             BinaryPrimitives.ReadUInt32LittleEndian(payload.Slice(8)));
     }
 
+    // ── Other small-payload events ──────────────────────────────────────────
+
+    /// <summary>0x01C7 UseDone: the Use/UseWithTarget completion signal (WeenieError code).</summary>
+    public static uint? ParseUseDone(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x019A InventoryPutObjectIn3D: server dropped item to ground.</summary>
+    public static uint? ParsePutObjectIn3D(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x00A0 InventoryServerSaveFailed: revert a speculative local inventory op.</summary>
+    public static uint? ParseInventoryServerSaveFailed(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x0052 CloseGroundContainer: server closed a ground container view.</summary>
+    public static uint? ParseCloseGroundContainer(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x0207 TradeFailure: server trade error code.</summary>
+    public static uint? ParseTradeFailure(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x0200 AddToTrade: (itemGuid, slotIndex).</summary>
+    public readonly record struct AddToTrade(uint ItemGuid, uint SlotIndex);
+
+    public static AddToTrade? ParseAddToTrade(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 8) return null;
+        return new AddToTrade(
+            BinaryPrimitives.ReadUInt32LittleEndian(payload),
+            BinaryPrimitives.ReadUInt32LittleEndian(payload.Slice(4)));
+    }
+
+    /// <summary>0x0202 AcceptTrade: initiator guid.</summary>
+    public static uint? ParseAcceptTrade(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 4) return null;
+        return BinaryPrimitives.ReadUInt32LittleEndian(payload);
+    }
+
+    /// <summary>0x0264 QueryItemManaResponse: (itemGuid, manaPercent).</summary>
+    public readonly record struct QueryItemManaResponse(uint ItemGuid, float ManaPercent);
+
+    public static QueryItemManaResponse? ParseQueryItemManaResponse(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 8) return null;
+        return new QueryItemManaResponse(
+            BinaryPrimitives.ReadUInt32LittleEndian(payload),
+            BinaryPrimitives.ReadSingleLittleEndian(payload.Slice(4)));
+    }
+
+    /// <summary>0x0274 CharacterConfirmationRequest — server-driven modal confirm.</summary>
+    public readonly record struct CharacterConfirmationRequest(
+        uint Type,
+        uint ContextId,
+        uint OtherGuid,
+        string Message);
+
+    public static CharacterConfirmationRequest? ParseCharacterConfirmationRequest(ReadOnlySpan<byte> payload)
+    {
+        if (payload.Length < 12) return null;
+        int pos = 0;
+        uint type      = BinaryPrimitives.ReadUInt32LittleEndian(payload);             pos += 4;
+        uint contextId = BinaryPrimitives.ReadUInt32LittleEndian(payload.Slice(pos));  pos += 4;
+        uint otherGuid = BinaryPrimitives.ReadUInt32LittleEndian(payload.Slice(pos));  pos += 4;
+        try
+        {
+            string msg = ReadString16L(payload, ref pos);
+            return new CharacterConfirmationRequest(type, contextId, otherGuid, msg);
+        }
+        catch { return null; }
+    }
+
     // ── Shared string reader (matches LoginRequest.ReadString16L) ───────────
 
     private static string ReadString16L(ReadOnlySpan<byte> source, ref int pos)