The CI desktop-build cache restores by prefix after dependency changes, so
it accumulates wheels for superseded pins; measured 210MB of sediment on a
real build host. stage_uv_cache copied that snapshot wholesale — stale
wheels shipped in every bundle and grew monotonically.
prune_uv_cache_to_lock now deletes archive buckets and wheel/sdist index
entries the shipped uv.lock cannot resolve, after staging. The lock is the
ship contract: CI transport may roll and accumulate; the payload never
ships sediment. Unidentifiable buckets (no dist-info) survive — pruning
fails open for unknown layouts, never for identifiable stale pins.
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