chore: address final review must-fix items

backend/AGENTS.md

@@ -49,10 +49,10 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   cooldown instead of retrying every tick, and writes go through
   `Store.Get` + `Store.Upsert` so new chapter never reorders list.
   Fetches use `bogdanfinn/tls-client` with Chrome profile as defence in depth
-  against fingerprint-based blocking; any failure log and skip. kagane sits
-  behind a Cloudflare JavaScript challenge the TLS client can't clear, so it is
-  browser-only: fetched over CDP via `BROWSER_WS_URL`, and simply not polled
-  when that's unset. See
+  against fingerprint-based blocking; any failure log and skip. kagane and
+  novelfull sit behind Cloudflare JavaScript challenges the TLS client can't
+  clear, so they are browser-only: fetched over CDP via `BROWSER_WS_URL`, and
+  simply not polled when that's unset. See
   `docs/superpowers/specs/2026-07-26-server-latest-chapter-polling-design.md`.
   Poller's `Store.Get` + `Store.Upsert` not wrapped in transaction, so
   userscript `PUT` that commits between the two can get overwritten by
@@ -77,5 +77,6 @@ Guidance for OpenCode (and Claude Code) working under `backend/`. See root `AGEN
   (background latest-chapter poller; defaults on, `1h`/`10m`/`14`/`20s`).
   `USERSCRIPT_PATH` (file served at `/u/{token}/manga-bookmark.user.js`,
   default `/userscript/manga-bookmark.user.js`, supplied by bindmount).
-  `BROWSER_WS_URL` (headless-shell CDP endpoint for kagane; unset disables
-  browser polling and leaves that site to the userscript alone).
+  `BROWSER_WS_URL` (headless-shell CDP endpoint for kagane and novelfull;
+  unset disables browser polling and leaves those sites to the userscript
+  alone).