feat: stratified LongMemEval dev slices#28
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--max-questions previously took the file-order prefix; the dataset is sorted by question type, so dev25 was 25x single-session-user — fine for smoke tests, misleading for category comparisons (matrix v1's LME QA numbers cover one category only). convert longmemeval --stratified samples max-questions evenly across the six question types with a fixed seed and writes the composition to sampling.json. Prefix behavior unchanged without the flag. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Drew Cain <groksrc@gmail.com>
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--max-questionstakes the file-order prefix, and the dataset is sorted by question type — so dev25 was 25× single-session-user. Fine for smoke tests; misleading for category comparisons (matrix v1's LME QA numbers cover one category only).convert longmemeval --stratifiedsamples evenly across the six question types (fixed seed, composition recorded insampling.json). Prefix behavior unchanged without the flag.3 new tests; suite green, lint clean.
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