fix(worker): sanitize report model arg, fix multi-repo summary attribution and standup-weekday sentinel

src/ClaudeDo.Worker/Report/ClaudeHistoryReader.cs

@@ -79,6 +79,14 @@ public sealed class ClaudeHistoryReader : IClaudeHistoryReader
                 }
                 else
                 {
+                    // Keep only the closing summary per (repo, day). If this turn moved to a
+                    // different repo/day (e.g. the session cd'd), flush the previous one first.
+                    if (lastAssistantText is not null &&
+                        (cwd != lastAssistantRepo || date != lastAssistantDate))
+                    {
+                        Bucket(buckets, lastAssistantRepo!, lastAssistantDate).Summaries.Add(lastAssistantText);
+                        lastAssistantText = null;
+                    }
                     lastAssistantText = text.Trim();
                     lastAssistantRepo = cwd;
                     lastAssistantDate = date;