Observation search skips a read begun before the write ended. That
comparison now uses the same overlap as the check path.
A clock learned on a later call was not checked against earlier calls
that kept the field. Serving would stamp those calls too, so the plan
stays unserved. A clock learned earlier is still refused when a later
call does not advance it.
Regression tests cover an overlapping empty update and a published_at
clock that one recorded call leaves unchanged.
Co-authored-by: morluto <morluto@users.noreply.github.com>
A later overwrite copied surviving derived fields into the sent-member
claim, so a members-only check rejected an update whose sent field still
matched. Serving floored sequences at zero and stored missing history as
zero, so a collection sequence learned from negative ranks skipped the
next value. An absence after a delete forgot the resolved collection, and
an encoded read could not observe an update spelled with another
collection encoding.
Regression tests cover each case.
Co-authored-by: morluto <morluto@users.noreply.github.com>
Serve write tools whose later reads confirm the effect, and keep main's
state-file ownership and part-wise reply measurement.
Squashed rebase of #5600 onto the rebased #5352 tip.
