The plain `prune` operation only removes unreferenced execution-cache
entries; named cache volumes (gradle-cache, go-build-cache, go-mod-cache,
pip-cache) are never reclaimed and grow without bound, causing the
dagger-data Docker volume to reach 200 GB over time.
Pass maxUsedSpace/targetSpace arguments to `prune` so Dagger also
reclaims named volumes when the total cache exceeds 75 GB, targeting
50 GB. Use an aggressive targetSpace of 20 GB for disk-space emergency
recovery in check-dagger. Add a dagger-prune task for manual use.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
