[burgholzer]

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Description

The Qiskit bridge discarded if_else even when the QDMI device advertised it, so preflight rejected supported feedback circuits. Map it to Qiskit's IfElseOp and keep it out of opaque OpenQASM gate declarations. Existing recursive checks still validate branch operations and their physical operands; devices without advertised support still reject control flow. No new execution engine or dependency is required.

Validation: all 225 Qiskit plugin tests passed independently on Qiskit 2.5.2 and 2.6.1; full repository lint passed. The new advertised-feedback regression fails against the unmodified backend. The regression observes both branches on distinct output wires, and a sampled-estimator test checks the resulting feedback ensemble. Existing target/serializer documentation remains accurate; no migration is needed.

AI assistance: Codex prepared, reviewed and tested this patch. Maintainer review is pending.

Checklist

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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