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* fix: eliminate TOCTOU race in zip packaging Open file once and derive both stat info and content from the same file descriptor to prevent race conditions where the file is modified between stat() and read_bytes() calls. * test: add regression test for TOCTOU stat/read consistency in packager The old implementation called file_path.stat() then file_path.read_bytes() as separate syscalls. The fix opens the file once and uses os.fstat() + fh.read() on the same handle. This test verifies the archived bytes and mode are consistent with the opened file descriptor.