Re-review caught that the previous fix was inert: fail() calls process.exit(1),
which skips finally blocks — so `cleanupTarball = false` never took effect and,
worse, the temp work dir (a full node_modules from the real install) leaked on
every failed run.
Move cleanup into fail() itself — the single failure-exit point, called from
everywhere including deep inside the run. On failure it removes the heavy work
dir and leaves the packed tarball in place for post-mortem inspection; the
success path removes both inline before the OK log. Drop the dead
`cleanupTarball` flag entirely.
Verified both paths: success removes work dir + tarball (exit 0); a forced
failure removes the work dir, retains the tarball, and exits 1.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BrihGWcrM9JGRyu41nzZYw
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