fix(claude-do): Run reporting: token accounting + populate empty result

BUNDLE — both fixes live in the Worker run-recording / persistence layer (where a TaskRun is written after an agent finishes), NOT in ExternalMcpService.cs. Keep this disjoint from the MCP-surface bundle so the two can run in parallel without worktree conflicts. The DTO fields (tokensIn, tokensOut, resultMarkdown) already exist and are surfaced by list_runs/get_run — the bug is at write time.

1.

ClaudeDo-Task: 49a6060a-5044-4f1b-8665-5cfc064b8a82

src/ClaudeDo.Worker/Runner/StreamAnalyzer.cs

@@ -44,6 +44,14 @@ public sealed class StreamAnalyzer
                         _structuredOutputJson = structuredProp.ToString();
                     if (root.TryGetProperty("session_id", out var sessionProp))
                         _sessionId = sessionProp.GetString();
+                    // Authoritative token totals live on the result event.
+                    if (root.TryGetProperty("usage", out var resultUsage))
+                    {
+                        if (resultUsage.TryGetProperty("input_tokens", out var inp))
+                            _tokensIn = inp.GetInt32();
+                        if (resultUsage.TryGetProperty("output_tokens", out var outp))
+                            _tokensOut = outp.GetInt32();
+                    }
                     break;
 
                 case "assistant":
@@ -66,7 +74,7 @@ public sealed class StreamAnalyzer
 
     public StreamResult GetResult() => new()
     {
-        ResultMarkdown = _resultMarkdown,
+        ResultMarkdown = FallbackResult(),
         StructuredOutputJson = _structuredOutputJson,
         SessionId = _sessionId,
         TurnCount = _turnCount,
@@ -75,6 +83,20 @@ public sealed class StreamAnalyzer
         ApiRetryCount = _apiRetryCount,
     };
 
+    private string? FallbackResult()
+    {
+        if (!string.IsNullOrEmpty(_resultMarkdown)) return _resultMarkdown;
+        if (_structuredOutputJson is null) return _resultMarkdown;
+        try
+        {
+            using var doc = JsonDocument.Parse(_structuredOutputJson);
+            if (doc.RootElement.TryGetProperty("summary", out var s))
+                return s.GetString();
+        }
+        catch { }
+        return _structuredOutputJson;
+    }
+
     private void TryAccumulateUsage(JsonElement root)
     {
         if (!root.TryGetProperty("event", out var eventProp)) return;