feat(roadblock): surface reported roadblocks in the review result

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/ClaudeDo.Worker.Tests/Runner/ReviewResultTests.cs

@@ -0,0 +1,30 @@
+using ClaudeDo.Worker.Runner;
+
+namespace ClaudeDo.Worker.Tests.Runner;
+
+public class ReviewResultTests
+{
+    [Fact]
+    public void No_blocks_returns_result_unchanged()
+    {
+        Assert.Equal("done", TaskRunner.ComposeReviewResult("done", Array.Empty<string>()));
+    }
+
+    [Fact]
+    public void Blocks_are_appended_as_a_section()
+    {
+        var outp = TaskRunner.ComposeReviewResult("done", new[] { "no creds", "db down" });
+        Assert.Contains("⚠ Roadblocks", outp);
+        Assert.Contains("- no creds", outp);
+        Assert.Contains("- db down", outp);
+        Assert.Contains("done", outp);
+    }
+
+    [Fact]
+    public void Null_result_with_blocks_still_lists_them()
+    {
+        var outp = TaskRunner.ComposeReviewResult(null, new[] { "x" });
+        Assert.Contains("⚠ Roadblocks", outp);
+        Assert.Contains("- x", outp);
+    }
+}