Every issue branch added an entry to the same list, so each branch
conflicted with `next` as soon as another one landed. The tracker already
records what is done, in more detail than the list did.
The Workflow section now says the tracker is that record, in place of the
rule that issue branches leave this file alone. Status points to the 1.0.0
milestone for what is open, and Next Step says @sneak tags `v1.0.0` after
running webhooker in limited production. In Future Steps, each item that
overlaps with what webhooker already does now says what exists and what is
still missing, and the delivery status and retry UI item is gone because the
event log, replay and resubmit cover it.
Model: opus-5-5