Follow-up to KoNit-K's commit: rebuild the promotion on the existing
`agent._extract_reasoning` helper (the same reader the ladder terminal and
`build_assistant_message` use) and write the promoted text back onto
`assistant_message.content` so the persisted assistant row carries the answer
as ordinary content. Without that the transcript tail was an assistant row with
empty content and only `reasoning`, which `drop_thinking_only_and_merge_users`
strips from the next request — the model would see its own answer vanish on a
"continue" turn.
Tests: trim to the two invariants (clean stop → one API call, persisted as
content; `finish_reason == "length"` → never promoted, continuation still
owns it) and keep the truly-empty terminal case. The prefill wire-payload
regression test now drives a non-clean-stop reasoning-only reply, which is the
only shape that still reaches the prefill rung.
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
teknium1