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SubscribeStar now downloads + verifies through the native core ingester instead of gallery-dl — the go-live switch for milestone #71. - download_backends: subscribestar added to NATIVE_INGESTER_PLATFORMS; a _NATIVE_INGESTERS registry + _resolve_native_campaign_id make _run_native_ingester / preview_source / verify_source_credential platform-aware. SubscribeStar's campaign_id IS the creator URL (no resolver); Patreon still resolves the vanity. preview now catches the shared NativeIngestError (covers both platforms). - platform_lock: subscribestar serialized (one paced walk at a time). - gallery_dl: subscribestar entry removed from PLATFORM_DEFAULTS (rule 22 — no fallback once native works). - frontend SourceActions: isPatreon → isNative (patreon|subscribestar) so the recover/recapture actions show for subscribestar; download_service's cursor/mode/post_first + the preview endpoint already key on uses_native_ingester, so backfill/recovery/recapture/preview light up for free. - tests: download_backends (subscribestar native), platform_lock (serialized), and three gallery-dl-sample tests repointed to hentaifoundry (api_credentials verify, gallery_dl_service skip-value, api_sources arm-no-preflight). post_is_gated stays best-effort (can't cause junk downloads); not gating this. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>