Read a durable Audience recalibration result

Owner, or the confirmed staff actor while the exact customer-issued support grant remains active. Poll the receipt returned by recalibrateAudience. A completed receipt retains the grounding and member counts; a failed receipt retains its refusal or safe error. Support actors use get_audience_creation_progress with audienceId and recalibrationId; this permission does not grant general Audience or workspace reads.