diigo-cache: README: workerd, not a vendor

Generated-by: Claude Opus 5.5

diigo-cache/README.md

@@ -1,7 +1,8 @@
 # diigo-cache
 
-Your diigo bookmarks, cached on Cloudflare, with a public page you can
-filter by week: `/public/<you>?in=2026-W41`. Your diigo session cookie
+Your diigo bookmarks, cached in a [workerd](https://github.com/cloudflare/workerd)
+worker, with a public page you can filter by week:
+`/public/<you>?in=2026-W41`. Your diigo session cookie
 is stored in one Durable Object and nowhere else.
 
 ## Getting started