refactor(gateway): session — merge split log-format literals

gateway/session_persistence.py

@@ -321,8 +321,7 @@ class SessionPersistenceMixin:
                 # A non-dict entry (corrupt file) must not abort the whole load.
                 if not isinstance(entry_data, dict):
                     logger.warning(
-                        "Skipping invalid session entry %r: "
-                        "expected dict, got %s",
+                        "Skipping invalid session entry %r: expected dict, got %s",
                         key, type(entry_data).__name__,
                     )
                     continue

gateway/session_transcript.py

@@ -178,9 +178,7 @@ class SessionTranscriptMixin:
                 spool_dropped_transcript_message(session_id, dropped)
             except Exception:
                 logger.warning(
-                    "pending fallback failed for replaced "
-                    "state.db transcript on %s",
-                    session_id,
+                    "pending fallback failed for replaced state.db transcript on %s", session_id,
                     exc_info=True,
                 )
         try:
@@ -188,9 +186,7 @@ class SessionTranscriptMixin:
             divert_session_transcript_jsonl(session_id, remaining)
         except Exception:
             logger.warning(
-                "JSONL divert failed for replaced state.db "
-                "transcript on %s",
-                session_id,
+                "JSONL divert failed for replaced state.db transcript on %s", session_id,
                 exc_info=True,
             )