feat: introduce stack-allocated `PyBuffer`#5894

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winstxnhdw wants to merge 9 commits intoPyO3:mainfrom

winstxnhdw:feat/stacked-pybuffer

Commits on Mar 19, 2026

Commits on Mar 20, 2026

refactor: apply suggestions
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Commits on Mar 27, 2026

tests: extend coverage
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