`mails: { <stage>: submitter | <address> }` on a need becomes `mail:`
on that state in aggregates.yaml (portal 0.3.43+), and `mail: { from,
reply_to }` on the plan becomes site.yaml's sender. The words map
gains `aggregates.yaml`, one subject and body per mailing stage, so
the model writes them like any other page; the fallback, in the
plan's language, says what happened and where the submitter's own
move is. A submitter mail needs a required email on the form; any
mail needs a sender. The uhhm and Tomter Vel plans tell the submitter
at every stage that matters to them.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
