🐛 Use valid OpenQASM in DDSIM status test

[simon1hofmann]

🤖 AI text below 🤖

Description

Use valid OpenQASM 3 in the DDSIM device-status test fixture:

• branch on the scalar bit c[0] instead of comparing a bit register with an integer;
• remove the redundant second full-register measurement, which is ill-typed after indexed access in the current frontend;
• preserve the test's dynamic-circuit workload and BUSY-to-IDLE status coverage.

Validation

• 20/20 repeated DDSIM QDMI submissions observed BUSY, completed with the requested shot count, and returned to IDLE
• repository pre-commit hooks
• git diff --check

Checklist

• The pull request only contains commits that are focused and relevant to this change.
• I have added or updated appropriate tests that cover the changed functionality.
• Documentation changes are not required for this test-only correction.
• A changelog entry is not required for this test-only correction.
• Migration instructions are not required because the public API is unchanged.
• 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]

This is valid OpenQASM 3, is it not?

[simon1hofmann]

Yes you're right and this should be fixed by #2181. Closing this workaround for now.