feat(scripts): strip translator credits and promo lines from fetched and existing EPUBs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/fetch-novel.js

@@ -6,6 +6,7 @@ import { load } from 'cheerio';
 import fs from 'fs';
 import path from 'path';
 import { loadPlugins, print, ROOT } from './load-plugins.js';
+import { stripPromo } from './clean-chapter.js';
 
 // Be gentle with the source site: few parallel requests, retries with backoff.
 const CONCURRENCY = 3;
@@ -51,10 +52,11 @@ const esc = s =>
   );
 
 // Chapter HTML is tag soup; re-serialise it as well-formed XHTML without
-// scripts or remote resources (an EPUB must be self-contained).
+// scripts, remote resources (an EPUB must be self-contained) or promo lines.
 const toXhtml = html => {
   const $ = load(html, null, false);
   $('script, style, iframe, link, meta, img, video, audio, source').remove();
+  stripPromo($);
   return $.xml();
 };