ci: prove verification uses the matrix interpreter

[doublewhy]

Plain-language summary

• Context: LilRAE supports Python 3.11 and 3.12, and the CI matrix selects each lane through UV_PYTHON.
• Problem: The clean wheel-smoke environment was hard-coded to Python 3.11, and cached Nox tooling could also let ordinary verification steps reuse the wrong interpreter.
• Fix: Forward UV_PYTHON explicitly to every uv run, build the clean wheel environment with that interpreter, and assert the installed probe's exact major/minor version.

Issues closed

Closes #29

Verification

• Full canonical nox verify under CPython 3.11: 61 passed, 88% coverage, policy, Ruff, mypy, clean sdist/wheel install, import, CLI help/version, and interpreter assertion passed.
• Full canonical nox verify under CPython 3.12: 61 passed, 88% coverage, policy, Ruff, mypy, clean sdist/wheel install, import, CLI help/version, and interpreter assertion passed.
• The runs used separate project environments and logged uv run --python 3.11 / uv run --python 3.12; the test sessions reported Python 3.11.15 / 3.12.13.
• Existing requires-python >=3.11 and Python 3.11/3.12 classifiers remain unchanged.
• git diff --check passed.

Merge order

• Stacked on chore(deps): bump raes from 3.0.0 to 3.3.0 #24; GitHub therefore shows this PR against branch dependabot/uv/dev/raes-3.3.0.
• Merge chore(deps): bump raes from 3.0.0 to 3.3.0 #24 first.
• After chore(deps): bump raes from 3.0.0 to 3.3.0 #24 lands, retarget this PR to dev, update it from the merged base, and rerun all required checks.
• Do not merge or enable auto-merge before the prerequisite and required checks are satisfied.

Scope

This is packaging and CI proof only. It adds no deployment runtime, target seam, compatibility alias, public API, release, tag, or artifact publication.