Merge claudedo/05827da5ecde413e9a2fe8edd45c24a8

src/ClaudeDo.Worker/Runner/InteractiveLaunchSpecService.cs

@@ -206,7 +206,7 @@ public sealed class InteractiveLaunchSpecService : IInteractiveLaunchSpecService
         {
             var task = await taskRepo.GetByIdAsync(id, ct)
                 ?? throw new KeyNotFoundException($"Task not found: {id}");
-            briefLines.Add($"- [{task.Status}] {task.Title} (id: {task.Id})");
+            briefLines.Add(RenderBriefEntry(task));
         }
 
         var sessionDir = Path.Combine(Paths.AppDataRoot(), "merge-helper-sessions", Guid.NewGuid().ToString());
@@ -253,6 +253,39 @@ public sealed class InteractiveLaunchSpecService : IInteractiveLaunchSpecService
         return new LaunchSpec(repoDir, resolvedClaude, args, env);
     }
 
+    // Renders one task as a brief list item. A description can itself be arbitrary Markdown
+    // (headings, lists, fenced code) — those must not merge into the brief's own task list, so
+    // the description is placed in a fenced code block indented to the list item's continuation
+    // column (2 spaces, matching "- "). That keeps CommonMark parsing the fence as part of THIS
+    // bullet rather than breaking the list, while the code fence itself stops any inner heading
+    // or list syntax from being interpreted. The fence length is extended past the longest run of
+    // backticks already present in the description so an embedded ``` block can't prematurely
+    // close it.
+    private static string RenderBriefEntry(TaskEntity task)
+    {
+        var header = $"- [{task.Status}] {task.Title} (id: {task.Id})";
+        var description = task.Description?.Trim();
+        if (string.IsNullOrEmpty(description)) return header;
+
+        var fence = new string('`', Math.Max(3, LongestBacktickRun(description) + 1));
+        var lines = new List<string>(4) { header, $"  {fence}" };
+        lines.AddRange(description.Replace("\r\n", "\n").Split('\n').Select(line => $"  {line}"));
+        lines.Add($"  {fence}");
+        return string.Join("\n", lines);
+    }
+
+    private static int LongestBacktickRun(string text)
+    {
+        var max = 0;
+        var current = 0;
+        foreach (var ch in text)
+        {
+            current = ch == '`' ? current + 1 : 0;
+            if (current > max) max = current;
+        }
+        return max;
+    }
+
     // Creates the ClaudeDo task that hosts a list-handler run (Mission Control's "Let Claude
     // handle it") and stamps the list repo's current HEAD as the review range's base commit.
     // The handler never gets its own worktree -- it commits straight to the list's working