feat: attach calendar metadata to active meetings

MeetingAssistant.Tests/CalendarRecordingPromptSchedulerTests.cs

@@ -123,6 +123,49 @@ public sealed class CalendarRecordingPromptSchedulerTests
         Assert.Equal(["stop", "start"], harness.Recorder.Commands);
     }
 
+    [Fact]
+    public async Task ActiveRecordingPromptAttachesTheSelectedAppointmentMetadataWithoutRestarting()
+    {
+        var harness = CreateHarness(isRecording: true, autoAcceptPrompts: false);
+        var firstMetadata = new MeetingMetadata(
+            "First planning",
+            ["Ada"],
+            "First agenda",
+            DateTimeOffset.Parse("2026-06-03T10:30:00+00:00"));
+        var secondMetadata = new MeetingMetadata(
+            "Second planning",
+            ["Grace"],
+            "Second agenda",
+            DateTimeOffset.Parse("2026-06-03T10:30:00+00:00"));
+        var firstMeeting = CreateMeeting(
+            harness.Clock,
+            id: "teams-first",
+            subject: "First planning",
+            metadata: firstMetadata);
+        var secondMeeting = CreateMeeting(
+            harness.Clock,
+            id: "teams-second",
+            subject: "Second planning",
+            metadata: secondMetadata);
+        harness.Provider.Meetings = [firstMeeting, secondMeeting];
+
+        await harness.Scheduler.SyncOnceAsync(CancellationToken.None);
+        harness.Clock.Now = firstMeeting.Start;
+        await harness.Scheduler.CheckDuePromptsAsync(CancellationToken.None);
+        await harness.PromptService.RespondAsync(
+            secondMeeting,
+            MeetingStartPromptResponse.AttachMetadataToCurrentMeeting);
+
+        Assert.All(
+            harness.PromptService.PromptRequests,
+            request => Assert.True(request.CanAttachToCurrentMeeting));
+        Assert.Equal(["attach-metadata"], harness.Recorder.Commands);
+        Assert.Same(secondMetadata, harness.Recorder.AttachedMetadata.Single());
+        Assert.Equal(0, harness.Recorder.StopCount);
+        Assert.Equal(0, harness.Recorder.StartCount);
+        Assert.True(harness.Recorder.CurrentStatus.IsRecording);
+    }
+
     [Fact]
     public async Task CanceledCachedMeetingDoesNotPromptRecording()
     {
@@ -302,14 +345,17 @@ public sealed class CalendarRecordingPromptSchedulerTests
             this.autoAccept = autoAccept;
         }
 
-        public List<CalendarMeeting> PromptedMeetings { get; } = [];
+        public List<MeetingStartPromptRequest> PromptRequests { get; } = [];
+
+        public IReadOnlyList<CalendarMeeting> PromptedMeetings =>
+            PromptRequests.Select(request => request.Meeting).ToList();
 
         public async Task ShowPromptAsync(
             MeetingStartPromptRequest request,
             Func<MeetingStartPromptResponse, CancellationToken, Task> handleResponseAsync,
             CancellationToken cancellationToken)
         {
-            PromptedMeetings.Add(request.Meeting);
+            PromptRequests.Add(request);
             pendingPrompts.Add(new PendingPrompt(request.Meeting, handleResponseAsync));
             if (autoAccept)
             {
@@ -349,6 +395,8 @@ public sealed class CalendarRecordingPromptSchedulerTests
 
         public List<MeetingMetadata?> StartMetadata { get; } = [];
 
+        public List<MeetingMetadata> AttachedMetadata { get; } = [];
+
         public Task<RecordingStatus> StartAsync(CancellationToken cancellationToken)
         {
             return StartRecordingAsync(null);
@@ -380,6 +428,15 @@ public sealed class CalendarRecordingPromptSchedulerTests
             return Task.FromResult(CurrentStatus);
         }
 
+        public Task<RecordingStatus> AttachMetadataToCurrentMeetingAsync(
+            MeetingMetadata metadata,
+            CancellationToken cancellationToken)
+        {
+            Commands.Add("attach-metadata");
+            AttachedMetadata.Add(metadata);
+            return Task.FromResult(CurrentStatus);
+        }
+
         private static RecordingStatus Status(bool isRecording)
         {
             return new RecordingStatus(