runtime.test.ts: drop the redundant `delete process.env.KANDEV_BUNDLE_DIR`
in afterEach — `process.env = { ...origEnv }` already restores the
original environment. The redundant delete would silently un-set the var
if a developer had it in their shell, leaking test side effects across
suites.
update-homebrew-tap.sh: fetch_sha256 now downloads into $WORK_DIR instead
of /tmp/. The EXIT trap covers WORK_DIR, so the .sha256 files are cleaned
up automatically. Avoids leaking 5 tmpfiles per release run on long-lived
runners.
José Almeida
75fe03c57b