import_media_render

Import one completed render into the same board asset store, with exact expectedAttempt and expectedSha256 from status. Live editor/read+write grant rechecked before every storage part; existing asset permissions, MIME validation, dedup and quota apply. At most the board video limit, streamed in bounded parts. Full byte count and SHA-256 checked before finalization. Identical retries are content-addressed; no durable operation receipt. No new render, provider call, content attachment, source/output deletion or private fields. After an ambiguous response inspect the asset by hash or retry only the identical input.