Discovery AniList client: drop removed recommendations (BL-0051)

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

test/discovery-anilist.test.js

@@ -75,6 +75,13 @@ test('requests refuse redirects', async () => {
   await assert.rejects(clientFor(redirected).title(1), e => e instanceof AniListSkip && e.reason === 'upstream');
 });
 
+test('recs drops recommendations whose media was removed', async () => {
+  const recs = fixture('recs');
+  recs.data.Media.recommendations.nodes = [recs.data.Media.recommendations.nodes[0], { rating: 10, mediaRecommendation: null }];
+  const out = await clientFor(() => json(recs)).recs(101);
+  assert.deepEqual(out.map(e => e.anilistId), [201]);
+});
+
 test('one malformed item invalidates a list response', async () => {
   const invalid = e => e instanceof AniListSkip && e.reason === 'invalid';
   const recs = fixture('recs');