save_job_output() used bare open('w') which truncates the output file
immediately. A crash or OOM kill between truncation and the completed
write would silently wipe the job output.
Write now goes to a temp file first, then os.replace() swaps it
atomically — matching the existing save_jobs() pattern in the same file.
Preserves _secure_file() permissions and uses safe cleanup on error.
Cherry-picked from PR #874 by alireza78a, rebased onto current main
with conflict resolution and fixes:
- Kept _secure_dir/_secure_file security calls from PR #757
- Used except BaseException (not bare except) to match save_jobs pattern
- Wrapped os.unlink in try/except OSError to avoid masking errors
Co-authored-by: alireza78a <alireza78a@users.noreply.github.com>
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