BE-040: done verb close a ticket from CLI/pager

Now
OPEN
Sev
MED

Closing a ticket today is manual (edit the header, delist the bullets) or the todo/mark-done.sh sweep. Wanted: a done mutation verb so be done BE-012 / pager :done BE-012 closes the ticket in one move header marked [DONE], the key's bullet delisted from the parent READMEs (the curated-open convention of BE-038). Once typable, the [done] button in :todo rows is just a hidden O done KEY spell (Nav) that splice waits on BE-038 landing. Requested by gritzko 2026-07-10.

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