fixup! diigo-cache: RSS in diigo's export shape, from cached items

Docs per the docs-files-api skill: a 1–2 line @file; what a declaration is or does in JSDoc on it, not in // comments or the file header.

Generated-by: Claude Opus 5.5

diigo-cache/src/rss.ts

@@ -1,8 +1,4 @@
-/**
- * @file cached diigo items as RSS 2.0, in the shape of diigo's RSS export
- * (`Tags:…;Description:…;Annotations and Sticky notes:…`), but well-formed
- * and with titles uncut. Pure: the caller supplies the dates.
- */
+/** @file cached diigo items as RSS 2.0, in the shape of diigo's RSS export. */
 
 import type { Item } from "./items.js";