Mirror verify_source_credential: download_backends.run_download is now the single
download entry, so that module is the ONE registry of how each platform both
downloads AND verifies — the seam that makes adding a platform a bounded job
(write its adapter construction next to its verify). The native-ingester
construction + campaign-id resolution moves out of download_service into
download_backends._run_native_ingester.
download_service.download_source drops its `if uses_native_ingester ... else
gdl.download` branch and calls one `self._run_download(...)` (a thin delegate to
run_download passing the service's gdl + sync sessionmaker). mode (tick/backfill/
recovery) is still chosen there from the backfill state machine and threaded
through. Removed the now-unused PatreonIngester / resolve_campaign_id_for_source
imports from download_service.
Tests: the phase-2 stub seam moves from svc._run_patreon_ingester to
svc._run_download (helper + the db-release test); the two native-construction
tests repoint to download_backends.run_download (patching
download_backends.resolve_campaign_id_for_source / PatreonIngester).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
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