fix(memory): enforce sqlite payload size limit

Author: summerx96

src/google/adk/memory/sqlite_memory_service.py

@@ -463,7 +463,11 @@ def _enforce_max_bytes(
   for item in (session_json, search_text, extracted_json, metadata_json):
     if item:
       total_bytes += len(item.encode("utf-8"))
-    raise ValueError(f"Session payload is too large ({total_bytes} bytes), exceeding the limit of {max_bytes} bytes.")
+  if total_bytes > max_bytes:
+    raise ValueError(
+        f"Session payload is too large ({total_bytes} bytes), exceeding the"
+        f" limit of {max_bytes} bytes."
+    )
 
 
 def _build_raw_text(events: list[Event]) -> str: