fix(agent): preserve Codex message items for replay

tests/test_hermes_state.py

@@ -308,6 +308,33 @@ class TestMessageStorage:
         assert "reasoning_content" in conv[0]
         assert conv[0]["reasoning_content"] == ""
 
+    def test_codex_message_items_persisted_and_restored(self, db):
+        """codex_message_items must round-trip through JSON serialization."""
+        db.create_session(session_id="s1", source="cli")
+        items = [
+            {
+                "type": "message",
+                "role": "assistant",
+                "status": "completed",
+                "id": "msg_123",
+                "phase": "commentary",
+                "content": [{"type": "output_text", "text": "Thinking..."}],
+            },
+            {
+                "type": "message",
+                "role": "assistant",
+                "status": "completed",
+                "id": "msg_456",
+                "phase": "final_answer",
+                "content": [{"type": "output_text", "text": "Done!"}],
+            },
+        ]
+        db.append_message("s1", role="assistant", content="Done!", codex_message_items=items)
+
+        conv = db.get_messages_as_conversation("s1")
+        assert len(conv) == 1
+        assert conv[0].get("codex_message_items") == items
+
     def test_reasoning_not_set_for_non_assistant(self, db):
         """reasoning is never leaked onto user or tool messages."""
         db.create_session(session_id="s1", source="telegram")
@@ -1173,7 +1200,7 @@ class TestSchemaInit:
     def test_schema_version(self, db):
         cursor = db._conn.execute("SELECT version FROM schema_version")
         version = cursor.fetchone()[0]
-        assert version == 8
+        assert version == 9
 
     def test_title_column_exists(self, db):
         """Verify the title column was created in the sessions table."""
@@ -1229,12 +1256,12 @@ class TestSchemaInit:
         conn.commit()
         conn.close()
 
-        # Open with SessionDB — should migrate to v8
+        # Open with SessionDB — should migrate to v9
         migrated_db = SessionDB(db_path=db_path)
 
         # Verify migration
         cursor = migrated_db._conn.execute("SELECT version FROM schema_version")
-        assert cursor.fetchone()[0] == 8
+        assert cursor.fetchone()[0] == 9
 
         # Verify title column exists and is NULL for existing sessions
         session = migrated_db.get_session("existing")