a26ed50e07
Address review feedback (PR #58133): the original test mocked _run_agent with _compressed=True directly, bypassing the detection logic. New tests mock _create_agent instead, so _run_agent's detection path runs naturally and reads agent.session_id / _last_compaction_in_place: 1. test_rotation_compression_exercises_detection_and_persists_rotated_session_id - Fake agent with rotated session_id -> verifies _compressed is set, compressed history is stored, and rotated session_id propagates to both response_store and X-Hermes-Session-Id header. 2. test_inplace_compression_exercises_detection_and_persists_compressed_history - Fake agent with _last_compaction_in_place=True, session_id unchanged -> verifies _compressed is set, compressed history is stored, and session_id does NOT rotate. 3. test_chained_rotation_propagates_effective_session_id - Two-request chain: first request triggers rotation, second request loads history using the rotated session_id stored by the first. Asserts the compressed transcript is loaded correctly for chaining.