bulk meta

meta/worker=l2/20260830T093258_00001.json

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+{"worker": "l2", "run": "20260830T093258", "seq": 1, "shard": "shards/run=20260830T093258/worker=l2/00001.parquet", "rows": 3371, "games": 49, "score_mean": 3906.2244897959185, "score_max": 18359, "ts": "2026-08-30T09:53:38.098490+00:00"}