Add meeting workflow automation

MeetingAssistant/MeetingNotes/IMeetingArtifactStore.cs

@@ -25,6 +25,14 @@ public interface IMeetingArtifactStore
         MeetingSessionArtifacts artifacts,
         AssistantContextState state,
         CancellationToken cancellationToken);
+
+    Task AppendAssistantContextAsync(
+        MeetingSessionArtifacts artifacts,
+        string content,
+        CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
 }
 
 public enum AssistantContextState

MeetingAssistant/MeetingNotes/MarkdownMeetingArtifactStore.cs

@@ -107,6 +107,30 @@ public sealed class MarkdownMeetingArtifactStore : IMeetingArtifactStore
             artifacts.AssistantContextPath);
     }
 
+    public async Task AppendAssistantContextAsync(
+        MeetingSessionArtifacts artifacts,
+        string content,
+        CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(content))
+        {
+            return;
+        }
+
+        Directory.CreateDirectory(Path.GetDirectoryName(artifacts.AssistantContextPath)!);
+        var prefix = File.Exists(artifacts.AssistantContextPath) &&
+            new FileInfo(artifacts.AssistantContextPath).Length > 0
+            ? Environment.NewLine
+            : "";
+        await File.AppendAllTextAsync(
+            artifacts.AssistantContextPath,
+            prefix + content.TrimEnd() + Environment.NewLine,
+            cancellationToken);
+        logger.LogInformation(
+            "Appended automation context to assistant context note {AssistantContextPath}",
+            artifacts.AssistantContextPath);
+    }
+
     private static string Render(
         MeetingSessionArtifacts artifacts,
         MeetingNote meetingNote,

MeetingAssistant/MeetingNotes/MeetingArtifactFrontmatter.cs

@@ -10,6 +10,8 @@ public sealed class MeetingArtifactFrontmatter
 
     public DateTimeOffset? EndTime { get; set; }
 
+    public List<string>? Attendees { get; set; }
+
     public string Meeting { get; set; } = "";
 
     public string Transcript { get; set; } = "";
@@ -36,6 +38,7 @@ public static class MeetingArtifactFrontmatterRenderer
         AppendScalar(builder, "title", frontmatter.Title);
         AppendDateTime(builder, "start_time", frontmatter.StartTime);
         AppendDateTime(builder, "end_time", frontmatter.EndTime);
+        AppendListIfNotNull(builder, "attendees", frontmatter.Attendees);
         AppendQuotedIfNotEmpty(builder, "meeting", frontmatter.Meeting);
         AppendQuotedIfNotEmpty(builder, "transcript", frontmatter.Transcript);
         AppendQuotedIfNotEmpty(builder, "assistant_context", frontmatter.AssistantContext);
@@ -142,6 +145,22 @@ public static class MeetingArtifactFrontmatterRenderer
         builder.AppendLine(value is null ? "\"\"" : EscapeQuoted(value.Value.ToString("O")));
     }
 
+    private static void AppendListIfNotNull(StringBuilder builder, string key, IReadOnlyList<string>? values)
+    {
+        if (values is null)
+        {
+            return;
+        }
+
+        builder.Append(key);
+        builder.AppendLine(":");
+        foreach (var value in values)
+        {
+            builder.Append("- ");
+            builder.AppendLine(EscapeListItem(value));
+        }
+    }
+
     private static void AppendBlockScalar(StringBuilder builder, string key, string value)
     {
         if (string.IsNullOrEmpty(value))