Add qbraid_qir.qiskit module (port of archived qiskit-qir)

[eidrynbot]

Summary

The microsoft/qiskit-qir package has been archived and is incompatible with Qiskit 2.x. The qBraid SDK currently depends on this package for qiskit → pyqir conversions.

Proposal

Port the qiskit-qir functionality into qbraid-qir as a new qbraid_qir.qiskit module:

• qiskit_to_qir(circuit, name, **kwargs) — main conversion function
• Updated for Qiskit 2.x compatibility
• Follows existing qbraid-qir conventions (cirq_to_qir, qasm3_to_qir pattern)
• Supports pyqir 0.10-0.12+ (typed and opaque pointers)

Motivation

1. Archived dependency: qiskit-qir is no longer maintained
2. Qiskit 2.x: The old package requires qiskit<2.0
3. Consolidation: Keep all QIR conversion code under qbraid-qir

Related

• Implementation PR: feat: add qbraid_qir.qiskit module for Qiskit to QIR conversion #271
• SDK integration PR: qBraid/qBraid#1132

License

The original qiskit-qir is MIT licensed. Attribution will be included per Apache 2.0 + MIT compatibility requirements.