docs: add JSDoc headers to all externally exported store functions

src/store/initialize.js

@@ -1,5 +1,15 @@
 import { SCHEMA_SCRIPTS } from '../schema.js';
 
+/**
+ * Initializes the database schema by running all schema scripts.
+ *
+ * @param {object} pool - The mssql connection pool.
+ * @returns {Function} An async function that initializes the schema.
+ *
+ * @example
+ * const fn = initialize(pool);
+ * await fn();
+ */
 export default function initialize(pool) {
   return async () => {
     for (const script of SCHEMA_SCRIPTS) {