ENGLISH·COURSE API
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    VideoLesson: ZodObject<
        {
            kind: ZodLiteral<"video">;
            id: $ZodBranded<ZodUUID, "LessonId", "out">;
            courseId: $ZodBranded<ZodUUID, "CourseId", "out">;
            moduleId: $ZodBranded<ZodUUID, "ModuleId", "out">;
            sequence: ZodNumber;
            title: ZodString;
            description: ZodString;
            source: ZodString;
            durationSeconds: ZodNumber;
            poster: ZodOptional<ZodString>;
            uploadDate: ZodOptional<ZodISODate>;
        },
        $strip,
    > = ...

    A video lesson — a Lecture. The primary content is a Video asset referenced by source (a URL to an MP4 in v1; HLS in a future change).

    In user-facing copy the canonical term is Lecture (see GLOSSARY.md).