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phonopy 4.0.0 pulls in symfc-1.7.0 as a hard dependency, adding ~150MB of extra import memory. When test_fireworks_cli.py forks pytest to launch rlaunch, the combined memory (pytest + fork + mongodb) exceeds the small CI runner's limit. Pinning phono3py<4 (phonopy<4) restores the pre-4.0 environment that CI was designed for, without symfc overhead.