GeezerVison

Reverts #550.

That change had Lookup.__init__ consider a path's children in reverse lexicographic order so that, where an unclean upgrade left more than one metadata directory for a distribution, the greater one was found first.

The ordering is lexicographic on the directory name rather than on the parsed version, so it only approximates a preference for the newer version — foo-1.9.0 still sorts above foo-1.13.1 — and so does not resolve every instance of python/cpython#100666.

The behavior shipped in v9.1.0, so the revert gets a news fragment.

Tests

The reverted MultipleVersionsTests included test_validity_preferred_to_version, a guard for #489. That condition is already covered independently by test_valid_dists_preferred, which is untouched, so the revert drops no unique coverage.

tox passes: 257 passed, 1 skipped, 41 subtests; mypy and ruff clean; perf within noise.

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