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docs: WO68 — expansion B negative (mis-design), B2 corrected - #397
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Summary
Records the Khmer expansion state: stage A completed with 73,954 teacher labels; stage B's NO_BETTER_THAN_TEACHER verdict was an artifact of training on Latin romanizations while evaluating against IPA gold (convention mismatch, not expansion evidence); stage B2 runs the matched-surface experiment (weak Latin labels + translit anchor, teacher scored on the identical 895-row translit test split in-job).