Gitea Actions does not honor fail-fast/max-parallel for cancelling other matrix runners when one fails. Use a single molecule job that runs all (scenario, platform) pairs via run_molecule_parallel.py. This gives true parallel execution + immediate termination on the first failure, which is what we need to debug efficiently. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>