Usage, grants, audit, and doctor

Usage queries return request, unit, token, provider-cost, user-cost, and latency rollups for an explicit UTC window. Pricing insights accept only closed UTC-midnight periods and include completeness and sample-suppression metadata.

Grants and reversals are immediate apply-scoped money actions and require an idempotency key. Rules should be previewed before proposal. Doctor probes are non-billable and accept only explicit auth, provider, or webhook checks. Audit queries attribute proposals, applies, grants, reversals, and sensitive metadata reads to a management-key ID.