feat(agent): add summary handling for reasoning items

Enhanced the AIAgent class to capture and normalize summary information for reasoning items. Implemented logic to handle summaries as lists, ensuring proper formatting for API interactions. Updated tests to validate the inclusion of summaries in reasoning items, both for existing and default cases.

run_agent.py

@@ -1596,6 +1596,11 @@ class AIAgent:
                     item_id = item.get("id")
                     if isinstance(item_id, str) and item_id:
                         reasoning_item["id"] = item_id
+                    summary = item.get("summary")
+                    if isinstance(summary, list):
+                        reasoning_item["summary"] = summary
+                    else:
+                        reasoning_item["summary"] = []
                     normalized.append(reasoning_item)
                 continue
 
@@ -1828,6 +1833,15 @@ class AIAgent:
                     item_id = getattr(item, "id", None)
                     if isinstance(item_id, str) and item_id:
                         raw_item["id"] = item_id
+                    # Capture summary — required by the API when replaying reasoning items
+                    summary = getattr(item, "summary", None)
+                    if isinstance(summary, list):
+                        raw_summary = []
+                        for part in summary:
+                            text = getattr(part, "text", None)
+                            if isinstance(text, str):
+                                raw_summary.append({"type": "summary_text", "text": text})
+                        raw_item["summary"] = raw_summary
                     reasoning_items_raw.append(raw_item)
             elif item_type == "function_call":
                 if item_status in {"queued", "in_progress", "incomplete"}: