AT-A1 / AT-A2 / AT-B1 / AT-C1

The Airtable steward-UI mutation patterns. AT-A1 is a flag-based action table, AT-A2 a record-detail action button, AT-B1 a create-request table, AT-C1 a watched-field recompute (ADR-0047). Every one calls the API; none writes domain state directly.