prune global virtual store

[TyceHerrman]

None of Aube's existing cleanup commands reclaim old graph directories under
<cacheDir>/virtual-store.

I noticed this with mise's npm backend. mise had only the current version of a
tool installed, but Aube's global virtual store still contained several older
versions and graph hashes.

Would it make sense for Aube to provide a command such as
aube virtual-store prune or extend aube store prune to cover this state?

Current Aube code only cleans two kinds of shared-store leftovers: temporary
directories from interrupted installs and broken hidden-hoist links. It does
not remove a live entry just because the current project does not use it,
because another project may still need it. I could not find a store-wide list
of projects or other consumers.

[jdx]

Thanks — confirmed. aube store prune only walked the CAS, so hashed graph entries in the global virtual store could accumulate indefinitely.

I opened PR #1273 to add project-registry-backed cleanup. Global-virtual-store installs now register their project (including warm installs after upgrading), and store prune marks entries referenced by live projects before sweeping the rest. Installs and pruning share a lock so the sweep cannot race materialization; --dry-run covers the new phase as well.

AI-assisted — Tool: Codex; model: unavailable/unavailable; version: unavailable.