`ticketing:auto-close` closed tickets with a single bulk UPDATE, which
fires no model events. With the audit declaration in place that left one
way of closing a ticket invisible: the Changes log would show a ticket
going open → resolved and then nothing, while the row itself read
`closed`. "Who closed this" is the question the trail exists to answer and
"the nightly sweep did" is a real answer — but only if the sweep writes it.
Closed one at a time through the model, chunked by id so a first sweep
over a backlog does not load every resolved ticket at once. Paging by id
is what makes that safe while the filtered column is being written.
