diigo-week: draft a potluck issue from a week of diigo bookmarks

An EmDash plugin (native, content:write only) with one admin page:
a diigo username and an ISO week. It reads diigo-cache's public page
(?in=<week>&by=created) as microformats, follows rel=next, and
creates a draft in issues shaped like seed/issues.json.

Transport is a DIIGO_CACHE service binding rather than ctx.http.fetch:
EmDash's SSRF guard refuses localhost, and the binding names one
worker. Logic lives in src/week.ts with the fetcher passed in; tests
read fixtures in diigo-cache's markup. The checklist's goal 2 now
names potluck; DiigoBridge waits.

Generated-by: Claude Opus 5.5

potluck/README.md

@@ -13,7 +13,7 @@ pnpm dev           # → http://localhost:4321/issues
 
 ## Bookmarks in, a zine out
 
-- **Your web, your site:** the bookmarks come from your own diigo account, so the web you read becomes something you publish ([PESOS](https://indieweb.org/PESOS)). For now issues are put together by hand. Pulling a week from diigo-cache is next.
+- **Your web, your site:** the bookmarks come from your own diigo account, so the web you read becomes something you publish ([PESOS](https://indieweb.org/PESOS)). The [diigo-week](../diigo-week/README.md) plugin drafts an issue from a week of them; you cut and comment.
 - **A week per issue:** `/issues/2026-w40`, by ISO week, UTC.
 - **Microformats:** feed readers and IndieWeb tools see each issue as an [h-entry](https://microformats.org/wiki/h-entry) and each bookmark as an [h-cite](https://microformats.org/wiki/h-cite).
 - **Plain HTML** that's easy to read: system fonts, one column.