The warning said "lifecycle transitions from superseded turn ARE NOT
being rolled back". When regenerating an OLDER turn, the listed
transitions can include intervening-turn ones that legitimately stand
on their own — they weren't authored by the superseded turn itself.
Reword to "lifecycle transitions at-or-after turn <id>" so operators
reading logs aren't misled into thinking every listed event id was
emitted by the target turn. Cosmetic change to a single log message.
Test: extends test_regenerate_with_prior_lifecycle_logs_warning to
assert the new phrasing is present and the old phrasing is gone.
Joseph Doherty
cc71fb4d01