Check presence of required backend/circuit/register/operation pins; null is missing, not an invalid credential or artifact for bounded backend/circuit/register/operation-pin records. Caller-supplied public/synthetic nonpersonal metadata only. No quantum simulation, device/API access, execution, calibration measurement, scientific validation or claim of circuit equivalence. Input limit: 32 KiB. Result retention: 24 hours; minimal receipt metadata: 90 days.

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