Record the parity walk for GET, PUT and DELETE /api/dashboard/widgets on the
current code: the first and the cached read, a full save with ids outside the
catalogue, a partial save that keeps stored fields and the per-chart range,
the schema, empty-body and base-token refusals, a save on the current token,
the recovery-off availability probe with and without an HRV series, a
delegate's read and refused writes, the reset, and an anonymous call.