stitchkit v0.87.1

Fixed

• A compaction summary reads after the block it stands for. It was written
  at the position of the first message it replaced, which the model's history
  cannot tell from the last — every replaced message is gone from it either
  way. A page that includes the compacted messages can: the summary landed
  between the first message and the rest of the block, so a person read one
  message, then a retelling of the next ten, then those ten. The summary now
  takes the position of the last message it replaces. The model's history and
  its order are unchanged, and so is every existing row: this places new
  summaries, it does not rewrite old ones.