* Add npm release track invariant and beta dist-tag procedure
* Revert "Keep older chat history and image previews stable (#2490)"
The timeline optimistic/pagination rework needs more work than main releases can wait for. Reverted together with #2484; both are reapplied on integration/timeline-optimistic-rework.
* Revert "Stop completed turns from appearing stuck (#2484)"
See the #2490 revert. #2490 built on this submission-authority change, so the two revert and reapply as a pair.