- Add `cargo test` before the darwin builds (gate is Linux-only; the macOS
leg is test-then-build) — a full dry-run of release-macos bar the upload.
- Add an `if: always()` prune step. The runner wipes the workspace each run,
so cargo target/ never accumulates (no sweep). The persistent cache is the
nix store: record the current toolchain in a persistent profile, keep the
2 newest generations (nix-env --delete-generations +2), reclaim the rest
(nix-collect-garbage). Pairs with min-free/max-free in the runner nix.conf.
claude@clouddev1
60dbb903cc