forgetNotes removed the note locally before the leased push, so a
rejected lease left a local notes ref without the note that the next
plain persist pushed without a lease. It now snapshots the ref and
restores it on rejection, reporting failed removals separately. forget
refused only merging/gate-pending/free-pending; built, pushed,
free-green, dispatch-unknown and dispatch-absent are in flight too and
are refused the same way. CHANGELOG and ship-policy say so.
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>