salvage_grown_transcript (the anti-growth pass at the compaction commit site)
popped reasoning / reasoning_content / reasoning_details from every assistant
turn but the newest, and pruned every prior-turn codex_reasoning_items, before
the result was committed as canonical history. With replay on by default that
is a permanent continuity loss on exactly the long sessions compaction serves.
Reasoning text is now never a salvage shrink target (tool output and summaries
still are), and codex items follow compress()'s route rule
(route_reads_prior_turn_reasoning).
86aa201bba