fix: PYTHONPATH values set in host can break `pdm run`#3746

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frostming wants to merge 2 commits intomainfrom

frostming/issue3742

Commits on Mar 5, 2026

fix: PYTHONPATH values set in host can break `pdm run`
frostming
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fix: add bugfix notes for build directory cache, Version._key assignment, and PYTHONPATH handling
frostming
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