fix: show structured-output summary instead of raw JSON in OUTCOME

A --json-schema run can echo the structured {"summary":...} JSON as the
result text, which then landed verbatim in task.Result and rendered raw in
the OUTCOME card. Unwrap the summary in StreamAnalyzer when the result text
is itself such a JSON object (a plain markdown result is kept as-is), and
add a UI safety net in ApplyOutcome for rows already persisted as raw JSON.

src/ClaudeDo.Ui/ViewModels/Islands/TaskMonitorViewModel.cs

@@ -1,5 +1,6 @@
 using System.Collections.ObjectModel;
 using System.Text;
+using System.Text.Json;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using ClaudeDo.Data;
@@ -258,16 +259,38 @@ public sealed partial class TaskMonitorViewModel : ViewModelBase, IMissionContro
         var idx = result.IndexOf(RoadblockMarker, StringComparison.Ordinal);
         if (idx < 0)
         {
-            SessionOutcome = result;
+            SessionOutcome = UnwrapSummary(result);
             Roadblocks = null;
             return;
         }
 
         var summary = result[..idx].TrimEnd().TrimEnd('⚠').TrimEnd();
-        SessionOutcome = string.IsNullOrWhiteSpace(summary) ? null : summary;
+        SessionOutcome = string.IsNullOrWhiteSpace(summary) ? null : UnwrapSummary(summary);
         Roadblocks = result[(idx + RoadblockMarker.Length)..].Trim();
     }
 
+    /// <summary>Safety net for older rows persisted as raw structured-output JSON: if the outcome
+    /// is a JSON object with a string <c>summary</c>, show that; otherwise keep the text as-is.</summary>
+    private static string? UnwrapSummary(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text)) return text;
+        var trimmed = text.TrimStart();
+        if (trimmed.Length == 0 || trimmed[0] != '{') return text;
+        try
+        {
+            using var doc = JsonDocument.Parse(trimmed);
+            if (doc.RootElement.ValueKind == JsonValueKind.Object &&
+                doc.RootElement.TryGetProperty("summary", out var s) &&
+                s.ValueKind == JsonValueKind.String)
+            {
+                var summary = s.GetString();
+                if (!string.IsNullOrWhiteSpace(summary)) return summary;
+            }
+        }
+        catch { }
+        return text;
+    }
+
     public async System.Threading.Tasks.Task ReplayLogFileAsync(string? logPath, CancellationToken ct)
     {
         if (string.IsNullOrWhiteSpace(logPath)) return;