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Data-split refactor (the anti-overfitting foundation the user asked for):
- TaskRecord gains split∈{train,val,test} and origin∈{real,dream}.
- assign_splits: real tasks deterministically split into val/test (disjoint);
DREAM-augmented tasks (origin='dream') NEVER enter val/test — they only go to
train. val gates updates; test is the final held-out measure.
- gbrain loader maps its held-out.jsonl -> test, benchmark.jsonl -> train/val,
so the gbrain held-out stays the true final score.
- consolidate(): train drives reflect, val gates; adds gate_mode='off' (greedy,
no hard filter) reporting val movement (greedy_improved/regressed/flat).
- run_gbrain/transfer/experiment score on test (val fallback); run_gbrain gains
--gate on|off. Legacy replay/holdout names normalized.
New test proves dream tasks never land in val/test. 21 tests pass; mock
experiment + gate=off both green.
Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>