[simon1hofmann]

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Description

Restore target registries after dynamic and duplicate registration tests. Dummy targets currently leak into later benchmark tests and make results depend on execution order. This change affects tests only. Validation: target and benchmark suites passed together in one process: 386 passed, 4 known expected failures.

Extracted from #1027 so this change can land independently of MQT Core 4.2. Original code authorship is retained.

Validation: Targeted tests and all lint hooks passed. Type checking used Python 3.14.

GPT-6 via Codex assisted with extraction, tests, and this description.

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[simon1hofmann]

This seems like a trivial fix, will merge it already and update the other PRs.