Add meeting workflow automation

MeetingAssistant.Tests/MeetingSummaryToolTests.cs

@@ -54,6 +54,8 @@ public sealed class MeetingSummaryToolTests
         Assert.Contains("title: Meeting", summary);
         Assert.Contains("start_time: \"2026-05-20T10:00:00.0000000+02:00\"", summary);
         Assert.Contains("end_time: \"2026-05-20T10:30:00.0000000+02:00\"", summary);
+        Assert.Contains("attendees:", summary);
+        Assert.Contains("- Ada", summary);
         Assert.Contains("meeting: \"[[../Notes/meeting|Meeting Note]]\"", summary);
         Assert.Contains("transcript: \"[[../Transcripts/transcript|Transcript]]\"", summary);
         Assert.Contains("assistant_context: \"[[../Assistant Context/context|Assistant Context]]\"", summary);
@@ -61,6 +63,49 @@ public sealed class MeetingSummaryToolTests
         Assert.Contains("# Summary\n\n- Done.", summary);
     }
 
+    [Fact]
+    public async Task WriteSummaryPreservesExistingSummaryAttendees()
+    {
+        var root = Path.Combine(Path.GetTempPath(), "meeting-assistant-tests", Guid.NewGuid().ToString("N"));
+        var artifacts = new MeetingSessionArtifacts(
+            MeetingNotePath: Path.Combine(root, "Meetings", "Notes", "meeting.md"),
+            TranscriptPath: Path.Combine(root, "Meetings", "Transcripts", "transcript.md"),
+            AssistantContextPath: Path.Combine(root, "Meetings", "Assistant Context", "context.md"),
+            SummaryPath: Path.Combine(root, "Meetings", "Summaries", "summary.md"));
+        Directory.CreateDirectory(Path.GetDirectoryName(artifacts.MeetingNotePath)!);
+        Directory.CreateDirectory(Path.GetDirectoryName(artifacts.SummaryPath)!);
+        await File.WriteAllTextAsync(
+            artifacts.MeetingNotePath,
+            """
+            ---
+            title: Meeting
+            attendees:
+            - Ada
+            - Grace
+            ---
+            """);
+        await File.WriteAllTextAsync(
+            artifacts.SummaryPath,
+            """
+            ---
+            title: Existing
+            attendees:
+            - Preserved
+            ---
+
+            Old summary.
+            """);
+        var tools = new MeetingSummaryTools(artifacts);
+
+        await tools.WriteSummary("# Summary");
+
+        var summary = await File.ReadAllTextAsync(artifacts.SummaryPath);
+        Assert.Contains("attendees:", summary);
+        Assert.Contains("- Preserved", summary);
+        Assert.DoesNotContain("- Ada", summary);
+        Assert.DoesNotContain("- Grace", summary);
+    }
+
     [Fact]
     public async Task ReadToolsSupportClampedLineRanges()
     {