🐛 Export forwarded Qiskit measurement results

[simon1hofmann]

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Description

• Export a measurement SSA result as its validated destination Qiskit Clbit
  when CBit cleanup forwards a later load to that result.
• Remove the old one-use restriction while keeping the existing strict
  measurement/store rule: the unique static destination store must remain in
  the same block and follow the measurement directly, apart from constants.
• Keep dynamic, duplicate, conditional, delayed, and non-measurement classical
  destinations fail-closed.
• Remove the earlier quantum-gap, reversed-store, alias-snapshot, and
  target-specific scheduling machinery. Operation ordering belongs to the
  mapping pass and is addressed by ⚡ Implement reorderForDominance function #2240; this exporter does not implement a
  second topological scheduler.

The remaining change fixes the Benchpress-produced cleanup form
measure; store; ... use %measurement_result without broadening accepted
instruction ordering.

Stack

1. ✨ Export structured control flow to Qiskit #2176 — structured-control export
2. 🐛 Export forwarded Qiskit measurement results #2177 — forwarded measurement-result export (this PR)
3. ✨ Preserve Qiskit parameter-vector provenance #2178 — parameter-vector provenance

The earlier symbolic-parameter and classical-expression foundations, #2150 and
#2175, are merged into main.

Testing

• Isolated release Python package and MLIR binding build: passed.
• Focused cleanup regression: fails on the parent with the former destination
  error and passes on this branch.
• test/python/test_mlir_qiskit_translation.py: 219 passed.
• uvx nox -s stubs: passed; generated stubs are unchanged.
• uvx nox -s lint: passed.
• git diff --check: passed.

The documentation build was not rerun for this update.

AI assistance: Codex assisted with the merge, overlap analysis, simplification,
implementation, tests, validation, commits, push, and 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.
• I have added migration instructions to the upgrade guide (if needed).
• 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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[simon1hofmann]

🤖 AI text below 🤖

Folded the focused implementation, regression coverage, and documentation from this PR into #2176, then restacked #2178 directly on #2176. This intermediate PR is no longer needed.