Add episode 855d20ed031f (river)

episodes/river/855d20ed031f.json

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+{"id": "855d20ed031f", "task": "river", "seed": 1003, "source": "bench", "bench": "bench-v2", "model": "reflection/Beam-1.0-501B-A23B", "use_lessons": true, "finished_at": 1793141691.2039158, "outcome": "error", "steps": 0, "lessons_in": 6, "events": [{"type": "error", "message": "HTTPStatusError: Client error '403 Forbidden' for url 'https://router.huggingface.co/v1/chat/completions'\nFor more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/403"}]}