learn-content-engine - v0.13.1
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    Type Alias Direction

    Direction: "source_to_target" | "target_to_source" | "both" | "random"

    EXP-018 / Phase 62 / v1.46.0: which way the card is drilled. target_to_source (default) shows the target language and asks the learner to recognise the source language (RECEPTIVE, easier). source_to_target shows the source and asks the learner to produce the target (PRODUCTIVE, harder). both / random let the renderer or the adaptive generator pick per attempt. Additive + optional; schema_version stays 1.2. Cloze ignores it (in-context).