Reuse existing requirements, WebSocket byte conversion, normalization, auth failure, diagnostic truncation, stream type, and catalog grouping owners across provider adapters and agent glue. Remove private forwarding layers while preserving provider policy and lifecycle boundaries.
Reject nonfinite Vercel catalog prices and per-million conversion overflow using the existing fallback. Regression cases cover numeric and scaled overflow.
Production reduction: 427 lines. Full provider and core suites, changed checks, plugin contracts, import boundaries, SDK API comparison, and zero-cycle checks validate the refactor; fresh isolated review found no actionable issue.
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