Fixed chats not loading in the v26.10.1 pre-release and added a trim smoke test (#1128)

app/TrimSmokeTest/Program.cs

@@ -0,0 +1,34 @@
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace AIStudio.TrimSmokeTest;
+
+/// <summary>
+/// Checks whether a trimmed build can still read and write the JSON of AI Studio, see TrimSmokeTest.csproj.
+/// </summary>
+public static class Program
+{
+    public static int Main()
+    {
+        //
+        // Several types of the app initialize a static logger from this factory, which only the start of
+        // the app assigns. Without it, they die in their type initializer, see app/Tests/TestHost.cs:
+        //
+        AIStudio.Program.LOGGER_FACTORY = NullLoggerFactory.Instance;
+
+        var failures = new List<string>();
+        foreach (var root in JsonRoots.ALL)
+            failures.AddRange(JsonContractWalker.FindBrokenContracts(root));
+
+        failures.AddRange(JsonRoundTrips.FindLosses());
+        if (failures.Count is 0)
+        {
+            Console.WriteLine($"- All {JsonRoots.ALL.Count} JSON roots can be read and written.");
+            return 0;
+        }
+
+        foreach (var failure in failures)
+            Console.WriteLine($"- Error: {failure}");
+
+        return 1;
+    }
+}