Stabilize abort coordinator test

MeetingAssistant.Tests/RecordingCoordinatorTests.cs

@@ -843,6 +843,7 @@ public sealed class RecordingCoordinatorTests
         };
         var audioSource = new ControlledAudioSource();
         var summaryPipeline = new CapturingMeetingSummaryPipeline();
+        var metadataProvider = new BlockingMeetingMetadataProvider(new MeetingMetadata("", [], ""));
         var coordinator = new MeetingRecordingCoordinator(
             audioSource,
             new TestSpeechRecognitionPipelineFactory(new EchoStreamingTranscriptionProvider()),
@@ -853,12 +854,14 @@ public sealed class RecordingCoordinatorTests
             new InMemoryRecordedAudioStore(),
             summaryPipeline,
             Options.Create(options),
-            NullLogger<MeetingRecordingCoordinator>.Instance);
+            NullLogger<MeetingRecordingCoordinator>.Instance,
+            meetingMetadataProvider: metadataProvider);
 
+        try
+        {
             var started = await coordinator.StartAsync(CancellationToken.None);
             await audioSource.WriteAsync(new AudioChunk([1, 0], 16000, 1), CancellationToken.None);
-        await WaitUntilAsync(() =>
-            FileContainsText(started.AssistantContextPath!, "state: transcribing"));
+            await WaitUntilAsync(() => File.Exists(started.AssistantContextPath!));
             var attachmentPath = Path.Combine(
                 Path.GetDirectoryName(started.AssistantContextPath!)!,
                 "Attachments",
@@ -885,6 +888,11 @@ public sealed class RecordingCoordinatorTests
             await Task.Delay(250);
             Assert.False(File.Exists(started.AssistantContextPath));
         }
+        finally
+        {
+            metadataProvider.Release();
+        }
+    }
 
     [Fact]
     public async Task AbortDoesNothingWhenRecordingIsIdle()