If redact_sensitive_text() raises or fails to import, stdout/stderr
were silently left unredacted and could leak API keys or tokens into
cron job delivery messages and logs.
Replace bare with a warning log and replace
both outputs with '[REDACTED - redaction failed]' to prevent leaks.
Root cause: silent exception swallow in _run_job_script()
Impact: potential secrets leak in cron job output delivery
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