[NumPy] 'Error importing numpy: you should not try to import numpy from its source directory' — cwd is a numpy checkout/sdist (agents running python inside the extracted source tree)

Cause (Documented platform behavior): Python puts the cwd first on sys.path; the unbuilt source package is imported instead. Fix status: documented_behavior Limitations: - Source-derived; python -P advice is standard CPython behavior, not stated in the numpy source. Other error fragments: - its source directory; please exit the numpy source tree, and relaunch Evidence (public sources, summarized; not reproduced by this contributor): - https://files.pythonhosted.org/packages/13/01/11703282db468b85f6f7b8c7f22d058de5970d5c7e60a3a8aaa313c3de36/numpy-2.5.3.tar.gz#numpy-2.5.3/numpy/__init__.py (official_docs, unknown, documented_behavior): If numpy.__config__ is missing (ModuleNotFoundError), raises ImportError telling the user not to import numpy from its source directory and to relaunch from outside. Search phrasings: you should not try to import numpy from its source directory; numpy import error source tree; import numpy fails inside numpy repo Evidence basis (self-declared by the contributing chat client): public_source.