Preserve dataset files when JSONL generation fails - #4
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A serialization error or interrupted input iterator previously truncated an existing dataset and left partial output. Write to a temporary file in the destination directory and atomically replace the destination only after successful serialization and close. Clean up temporary files on failure.
Keep iterable input, Unicode output and empty-file behavior. Document atomic replacement's scope, including new-file permissions and the absence of power-loss or concurrent-writer guarantees. Add Linux/Windows CI.
Validation: all 72 tests pass, including 7 new regressions for replacement, Unicode, empty input, serialization/iteration failure and failed replacement.