Checkpoint peering identity and opt-in discovery

public/manga.js

@@ -30,6 +30,9 @@
 
   const sources = arr(meta.sources).filter(source => source && (source.name || source.url));
   const tags = arr(meta.tags).filter(Boolean);
+  const numberedChapters = M.chapters.map(chapter => /^Ch\. (\d+(?:\.\d+)?)/.exec(chapter.label || ''))
+    .filter(Boolean).map(match => Number(match[1]));
+  const firstNumber = numberedChapters.length ? Math.min(...numberedChapters) : null;
   const books = {};
   for (const book of M.books) books[book.key] = book;
   const selectedBooks = new Set();
@@ -39,6 +42,9 @@
       h('h1', {}, M.title),
       arr(meta.altTitles).length ? h('div', { class: 'muted' }, arr(meta.altTitles).join(' · ')) : null,
       h('div', { class: 'muted' }, [arr(meta.authors).join(', '), meta.status, releaseDate(), TYPE[M.direction]].filter(Boolean).join(' · ')),
+      firstNumber > 1 ? h('div', { class: 'coverage-indicators', role: 'status' },
+        h('span', { class: 'coverage-badge coverage-partial' }, 'Series coverage partial'),
+        h('span', { class: 'small' }, `This library starts at chapter ${firstNumber}; earlier numbered chapters are absent.`)) : null,
       h('div', { class: 'chips' }, tags.map(tag => h('a', { class: 'chip chip-link', href: libraryUrlForTags([tag]), title: `Show manga tagged ${tag}` }, tag))),
       meta.description ? h('p', { class: 'desc' }, meta.description) : null,
       h('div', { class: 'actions' },