[simon1hofmann]

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Description

Preserve logical SWAPs in target-independent and native circuits so QASM exports do not depend on Qiskit layout metadata. Native compilation also uses the circuit width, allowing circuits larger than a supplied device when only its gate set is requested.

Extend the existing permutation/export and hardware-independence tests. Mapped compilation retains device capacity and routing. No new dependencies.

Validation: full test suite on Qiskit 2.2.3 and 2.6.0 (723 passed and 4 existing expected failures on each); uvx nox -s lint.

AI assistance: Codex helped implement and test these MQT Bench fixes and prepare this description.

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.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
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• 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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[burgholzer]

LGTM 👍🏼