feat(dataset): typed distribution sampling, percentile targets, sticky sequence buckets, first-turn context#1130

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Commits on Jul 7, 2026

feat(config): PercentileDistribution targets p50/p99/mean directly

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feat(dataset): sample typed ISL/OSL distributions per turn (no flattening, no double-sampling)
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feat(dataset): sequence_distribution buckets sample full typed shapes

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feat(dataset): sample typed distributions for turns, delay, image, audio, rankings

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feat(dataset): first_turn_isl starting context + relative sequence weights

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docs(tutorials): percentile distribution + typed sequence_distribution buckets

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test(dataset): end-to-end percentile ISL verification

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fix(config): final review fixes - finite percentile guard, zero-weight buckets, get_statistics normalization
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Commits on Jul 8, 2026