The prior test asserted 404 on /media/exports/Gallery.zip against an empty
stack — it would pass even if exports were still written under /media, because
no archive was ever produced. Now it:
1. seeds an upload, releases the gallery, and polls until the real zip job
writes Gallery.zip to disk;
2. asserts the archive is NOT served from public /media (the CR2 leak); and
3. asserts it IS retrievable via the gated ticket endpoint (200 + PK zip
magic) — proving the 404 means "not public", not "no file".
Also fixes a test-isolation gap the CR2 relocation introduced: __truncate wiped
media_path but not export_path, so a real export would leave Gallery.zip on disk
and break export.spec's "ready-but-file-missing → 404" test. truncate_all now
purges export_path too. Full 06-export dir: 5/5 green, no contamination.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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