fix typos

fix typos

fix typos and escaped characters

fix hash

split with a diff hash

using hash based dataset split

Remove old 'train' split, keeping only train_sft/train_rl/test

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fix: remove trailing quotes from group_linking_terms

feat: rebalance all data with stratified split by difficulty (bins: 0-2, 2-3, 3-4, 4-4.5, 4.5-5) into train_sft (10%), train_rl (80%), and test (10%)

feat: reseed training data and split into train_sft (10%) and train_rl (90%)

fix: restore original train/test split

Removed trailing quotes from group_themes

Clean dataset: Remove 13 URL puzzles, fix 2 backtick typos, convert puzzle_id to string

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