Design for audit findings C1 and M1. A grade carried forward from an older
ungraded visit is shown under a newer inspection's date ("Good · 2025" for
Rabbsfarm, whose 2025 inspection gave no grade), and "Inspected" dates show the
last graded inspection rather than the latest visit. The rule moves into
int_ofsted_latest and a new fact_ofsted_latest mart, shipped as a pipeline PR
and then a backend/UI PR.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>