uv_cache_dir() wrote a bare ".seeded" marker after the first seed and
never compared against the payload again, so an updated install never
received the new payload's wheels. Enabling a plugin re-resolves without
--offline, so uv fetched the new pins from PyPI instead; for
cryptography 50.0.1 on Windows ARM64, which has no wheel on PyPI, that
is an sdist Rust build.
The marker now records the running uv.lock's digest, so the first call
under a new lock merges the new payload into the existing cache.
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