A turn that persists a user row with no assistant row (suppressed reply,
or two concurrent turns interleaving their flushes) leaves a user;user
pair in state.db. The defensive pre-request repair_message_sequence then
re-fires on EVERY request for the rest of the session's life — it mutates
only the per-request list, never the stored transcript.
Add repair_alternation (default False) to get_messages_as_conversation
and pass it from the three live-replay restore sites (gateway
load_transcript, CLI session resume x2). Inspection/export consumers
(trace upload, context guard, api_server history) keep the verbatim
default.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>