phamnazage-jpg 256975e10c feat(audit): add pricing signature guards and reporting ...

Add snapshot, signature, and drift guard support for Vertex AI, Cloudflare Workers AI, and Perplexity API, backed by a queryable audit table and recent-window view.

This commit also wires the audit query layer into daily signal materialization and report generation so structure drift becomes a first-class signal instead of a log-only artifact.

2026-05-15 22:34:22 +08:00

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