docs: add JSDoc headers to all externally exported store functions

src/store/article/setBrandIdBySku.js

@@ -5,6 +5,17 @@ import {
 import queryBySku from './queryBySku.js';
 import resolveArticleBySku from './resolveArticleBySku.js';
 
+/**
+ * Sets (or clears) the brand of an article by its SKU.
+ *
+ * @param {object} pool - The mssql connection pool.
+ * @returns {Function} An async function that sets the article brand.
+ *
+ * @example
+ * const fn = setBrandIdBySku(pool);
+ * const article = await fn(42, 'SKU-1', 3);
+ * // => { id, sku, name, ... }
+ */
 export default function setBrandIdBySku(pool) {
   const resolve = resolveArticleBySku(pool);
   const load = queryBySku(pool);