Add meeting assistant speech and summary automation

MeetingAssistant/MeetingNotes/MarkdownMeetingArtifactStore.cs

@@ -58,6 +58,28 @@ public sealed class MarkdownMeetingArtifactStore : IMeetingArtifactStore
             ToYamlState(state));
     }
 
+    public async Task UpdateAssistantContextMetadataAsync(
+        MeetingSessionArtifacts artifacts,
+        string agenda,
+        DateTimeOffset? scheduledEnd,
+        CancellationToken cancellationToken)
+    {
+        Directory.CreateDirectory(Path.GetDirectoryName(artifacts.AssistantContextPath)!);
+        var existing = File.Exists(artifacts.AssistantContextPath)
+            ? MarkdownDocumentParser.SplitOptional(await File.ReadAllTextAsync(artifacts.AssistantContextPath, cancellationToken))
+            : new MarkdownDocument(false, "", "## Live Context" + Environment.NewLine);
+        var existingFrontmatter = ReadFrontmatter(existing.Frontmatter);
+        var state = ParseState(existingFrontmatter.State);
+
+        await File.WriteAllTextAsync(
+            artifacts.AssistantContextPath,
+            Render(artifacts, state, agenda, scheduledEnd, existing.Body),
+            cancellationToken);
+        logger.LogInformation(
+            "Updated assistant context note {AssistantContextPath} calendar metadata",
+            artifacts.AssistantContextPath);
+    }
+
     private static string Render(
         MeetingSessionArtifacts artifacts,
         AssistantContextState state,
@@ -100,6 +122,9 @@ public sealed class MarkdownMeetingArtifactStore : IMeetingArtifactStore
 
     private sealed class AssistantContextFrontmatterYaml
     {
+        [YamlMember(Alias = "state")]
+        public string? State { get; set; }
+
         [YamlMember(Alias = "agenda")]
         public string? Agenda { get; set; }
 
@@ -107,6 +132,19 @@ public sealed class MarkdownMeetingArtifactStore : IMeetingArtifactStore
         public string? ScheduledEnd { get; set; }
     }
 
+    private static AssistantContextState ParseState(string? value)
+    {
+        return value?.Trim().ToLowerInvariant() switch
+        {
+            "transcribing" => AssistantContextState.Transcribing,
+            "speaker recognition" => AssistantContextState.SpeakerRecognition,
+            "summarizing" => AssistantContextState.Summarizing,
+            "finished" => AssistantContextState.Finished,
+            "error" => AssistantContextState.Error,
+            _ => AssistantContextState.Transcribing
+        };
+    }
+
     private static string ToYamlState(AssistantContextState state)
     {
         return state switch