v0.2.1 - clean release

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v0.2.1 initial release: 19.3M tetragon events {train:16,951,950, test: 2,349,965} timespans: {[train: 2026-04-05 15:40:57.657541+00:00 -> 2026-04-19 22:09:18.103543+00:00], [test: 2026-04-18 22:41:25.297890+00:00 -> 2026-04-20 02:01:27.614304+00:00]} labeled test events: 705,852 / 2,349,965 (30.0% of test split)