The recurring "post shows a zip but no images" report had no diagnostic: when
_import_archive captured an archive as a bare PostAttachment — because the
bomb-guard probe rejected it, or extraction yielded zero members (corrupt /
unsupported / missing extractor backend), or it held only non-media files — it
returned status="attached" silently.
Now those paths set ImportResult.error with the specific reason and log a
warning, and download_service records each as {file, reason} under the event's
metadata.unextracted_archives (None when every archive extracted cleanly). So
the next run names exactly which archives failed and why, instead of leaving the
operator to guess. No behaviour change to the happy path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
19eb4e9388