ENGLISH·COURSE API
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    Resource: ZodObject<
        {
            id: $ZodBranded<ZodUUID, "ResourceId", "out">;
            lessonId: $ZodBranded<ZodUUID, "LessonId", "out">;
            title: ZodString;
            url: ZodString;
            kind: ZodEnum<
                { pdf: "pdf"; slides: "slides"; code: "code"; other: "other" },
            >;
        },
        $strip,
    > = ...

    A supplementary file attached to a Lesson. Resource is a first-class domain entity in v1 (not a field of Lesson) so the Workbook view, analytics, and shared Resources are possible without a refactor — see design.md §D1.

    url accepts either an absolute URL or a site-relative path beginning with / (v1's static-asset convention — see design.md §D9 "Resource URL: static or signed").