The salvage moved generated images/videos to cache/generated/<kind>/ so the
24h sweep stops deleting the only copy (#126445), but two consumers still
only knew the old swept dirs:
- Strict media delivery (HERMES_MEDIA_DELIVERY_STRICT=1) allowlists cache
roots via _MEDIA_DELIVERY_CACHE_SUBDIRS; without "generated" a day-old
generated image was rejected once the recency window lapsed, i.e. the
move broke re-sending artifacts on public gateways.
- iter_cache_files (Modal/remote resync) walked the new never-swept tree in
full, so every sync re-uploaded the whole generation history. Only files
within the sweep window (MEDIA_CACHE_MAX_AGE_HOURS) are synced now.
GENERATED_SUBDIR and MEDIA_CACHE_MAX_AGE_HOURS live in agent/provider_media
as the single source for the image/video writers, the gateway allowlist and
cleanup default, and credential_files. Also trims duplicated comments and
fixes the pet orchestrate comments (nothing prunes cache/generated/images).
Tests use direct function refs instead of importlib strings.
266499524e