OptionalepisodeOptionalepisodeOptionaltreatmentThe episode an episode_docs run is scoped to (its bounds are that episode's stay window), so
the returned documents can be stamped with it as provenance at ingest. Null for unbounded pulls
— those span multiple episodes and must fall back to date-of-service attribution.
episode_docsdate bounds (MM/DD/YYYY, facility-local); null = unfiltered download.