The provider matrix now sends a long-form prompt, recomputes each
access-log row's expected cost_usd and cache_cost_usd from hardcoded
published per-1k rates and the row's persisted token buckets, and
finishes with a raw-SQL audit of every usage row straight in the
management sqlite store. Bedrock defaults to Sonnet 4.6 and the
workflow gains a bedrock_model dispatch input plus a push trigger on
this branch while it is under review.