- The download and edit failure lines go back after their DB write: a job the
write could not fail is not a failed job, and the worker's child_exit line
already says it failed.
- The download child's runner is the last stop before Python's hook: an
escaping exception is one download.child.failed line with its chain scrubbed,
then exit 1, instead of a raw stderr traceback carrying the URL.
- A crash the database will not record carries its stack once, and the
fail-write line has an event code.
- The job's own generic-extractor name is taken out as a literal (formats.hiding),
so brackets and colons in a direct link's file name no longer leak; the
pattern stays as the fallback. `Downloading just the video <id>` is covered.
- Tests: scrubbed_stack's cause, suppress, unprintable and text-format paths,
the image steps' failure kinds, the watchdog error through the real
_fail_running, exact poster/storyboard messages, ffmpeg skip marker.