0b8a848754
_turn_transcript_messages pre-classified every message with _is_compressed_summary_message (full content flatten + prefix scan), then _message_response re-ran the same classifier inside its projection -- 2x per non-summary row, 3x per summary row on every run.completed emit. The outer guard was redundant: _message_response already yields display_kind hidden for pure handoffs. One projection call per row now. Surfaced by the post-merge simplify re-review of #91517/#91535.