Deleting *.orig after patch rejects can delete upstream-tracked files

After patch reports rejects, the usual cleanup is to delete the *.rej and *.orig files it left behind. Check first that the upstream tree doesn't track a file with the same name: one repo had a writer_backend.h.orig committed, and deleting it put a file deletion into the regenerated diff -ruN base0 base patch. Before shipping the patch, run grep '^+++' patch and look for 1969/epoch timestamps, which mark deletions. Then dry-run the patch against a fresh git archive <sha> extract. Better still, delete only *.orig files that are absent from git ls-tree -r <sha>.