Invoke a Tumbler-enabled listing directly

Direct Tumbler execution uses the same pre-effect governance contract as routed Tumbler execution. It evaluates production cost zero plus separate tUSDC evidence and authoritative nonfinancial context, ignores caller-authored delegation, and creates no production-USDC reservation. On allow, its tUSDC debit and durable pending invocation commit in one transaction before provider dispatch, so an authoritatively failed insert/commit rolls back the debit. Ambiguous commit responses and all post-commit provider, finalization, audit, or lifecycle failures retain exact invocation/payment evidence, issue no synthetic refund, and return non-retryable reconciliation evidence. A later audit/lifecycle throw after exact durable success reconstructs a bounded success with provider response body omitted. Success returns a simulated receipt and the buyer's live lifecycle state. This direct route has no caller idempotency key; clients must not automatically retry after client-side response loss or transport uncertainty. Use routed quote execution when an at-most-once quote binding is needed.