GitHub CLI can print an HTTP error response to stdout before exiting nonzero.
Appending pending inside command substitution retained that response in the
conclusion variable, which the polling loop misread as a terminal build result.
Check the command's exit status and set conclusion to pending on failure.
Preserve terminal build failure handling, polling frequency, and step timeout.
Run the workflow step with stubbed commands in CI to cover API-error recovery
and genuine build failures.
The unsaved constructor dependency test expected the temporary directory's
original spelling, but the dependency tree returns its canonical path.
Resolve the expected path with the native asynchronous API to handle Windows
short names and symlinked temp roots. The production dependency-tree behavior is unchanged.
