The Windows runner's default pwsh does not stop when a native command fails, so
a multi-command step reported only its last command: a failing cultnet-py suite
went green inside "Verify Python RUDP reliability". The job now defaults to Git
Bash, which the runner starts with -e -o pipefail. The pwsh consolidation guard
checks git ls-files' exit code instead of treating a failed listing as clean.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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