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Add a general-purpose Delay pseudo-gate that idles a qubit for a specified duration, closing the last gap in Circuit Features vs Qiskit. Gate: Delay(duration, unit) with Delayable interface for typed access to duration/unit/seconds. Supported units: ns, us, ms, s, dt. Builder: fluent Delay(qubit, duration, unit) method. Simulators: statevector skips delays (ideal no-op); density matrix applies noise channel lookup for decoherence during idle periods. Serialization: QASM 3.0 round-trip (delay[100ns] q[0]), Quil (skip), all hardware backends handle gracefully. IonQ integration: Delay automatically converts to native NOP gate with duration in microseconds, works in both QIS and native gatesets. Transpiler: delays preserved through decomposition/validation, new RemoveDelays pass mirrors RemoveBarriers.
marshalGate now returns (gate, ok, err) — ok=false means the gate should be dropped (delay in QIS mode). Native mode converts delay to NOP with microsecond duration. detectGateset skips delays so they never influence gateset detection.
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