fixup! refactor: rename diigo-dump to diigo-cache

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/diigo.ts

@@ -1,8 +1,4 @@
-/**
- * @file Diigo dump logic: the bookmark generator over any fluent handle.
- * Site-flavored configuration (URL, headers, cookie) lives where the webapp
- * instance is minted (src/index.ts: mint); only the traversal is here.
- */
+/** @file the diigo bookmark generator over a fluent handle (not used by the worker today). */
 
 export type PagedGet = {
 	pathjoin(ref: string): PagedGet;