built_scale_project() scaffolded ~66 MB (built node crate) into a
pid-suffixed tempdir, so its wipe-before-scaffold never hit a previous
run's copy: one leaked directory per test-binary run. 159 of those
(~10 GB) filled the host's 16 GB /tmp tmpfs to 100%, breaking every
std::env::temp_dir() consumer. A fixed name under CARGO_TARGET_TMPDIR
(real disk, reclaimed by cargo clean) makes the existing wipe reclaim
the previous run — steady state is exactly one directory. Trade-off:
two concurrent cargo-test invocations over the same checkout collide
on the fixed name, the documented pre-existing caveat class for this
suite (#223).
closes#257
claude
84e1075176