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feat(core): optimize file copy with reflink/hardlink fallback - #237
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Use cp reflink/clonefile, then hardlink, then shutil.copy2 for plain template file copies (CNA parity). Hardlinks stay opt-out via CPA_COPY_HARDLINK=0 and are skipped when allow_hardlink is False. Closes#230 Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
copy_file_efficient(): reflink/clonefile → hardlink →shutil.copy2CPA_COPY_HARDLINK=0Test plan
uv run pytest packages/create-python-app-core/tests/test_loaders.pyfile://template and confirm files are writtenCloses#230
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