#405 orchestrator.py uses f-strings for SQL table names instead of sql.Identifier()

engine/orchestrator.py:277,372,553,762,794,988 uses f-strings for absurd table names. While queue_name is validated, defense-in-depth requires using sql.Identifier() like absurd_client._table() does. Fix: Use absurd_client._table() or sql.Identifier() consistently.