ci: enforce exact file-version boundaries - #8029
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Part 12/12 of #7877. Depends on #8028.
This is the final independently reviewable step implementing the layout demonstrated in #7979.
This PR adds a CI boundary checker that prevents architectural drift after the refactor. It rejects persisted selectors, cross-layer selector ownership, version ordering, implicit exact/selector conversions, shared-runtime version dispatch, and unapproved file-version checks outside the declared boundaries.
The checker includes a self-test with positive and negative fixtures and runs in the Rust workflow. It guards the structure established by the preceding PRs without changing runtime behavior.
Validation:
python3 ci/check_file_version_boundaries.py --self-testpython3 ci/check_file_version_boundaries.pypython3 -m py_compile ci/check_file_version_boundaries.pycargo clippy --all --tests --benches -- -D warnings