The act runner has a Go format bug that evaluates step outputs at
cleanup time and crashes with %!t(string=...), marking the job as
failed even though all steps succeeded.
Replaced steps.bump.outputs.* with GITHUB_ENV variables which
persist across steps without triggering the runner's output
evaluation bug.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
cae0c0b265