feat: autotag scoring overhaul, dump-based explore index, and lyrics search

Consolidates in-progress work across autotag, explore, and library:

- autotag: beets/Picard-informed scoring engine — ID-first matching, VA
  handling, recommendation tiers, and a merged distance/rank cascade, with
  an eval harness for regression tracking.
- explore: offline MusicBrainz dump import/incremental refresh replaces the
  legacy tier crawl; index-first local search with fuzzy matching and a
  dedicated ranker; disk-free guards for dump downloads.
- library: artist-credit extraction and matching.
- lyrics: owned-library lyric search (FTS) with LRCLIB backfill.

Also: rewrite README to be user-focused, and migrate upstream to
git.ljones.me/yonlu/yellowjacket.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/cover-grid/cover-grid.ts

@@ -46,6 +46,7 @@ import type { DragPayload } from '@utils/drag-controller';
 import { ContextMenuController } from '@utils/context-menu-controller.js';
 import type { ContextMenuHost } from '@utils/context-menu-controller.js';
 import { FavoritesController } from '@store/controllers/favorites-controller';
+import { artistLink, exploreLinkStyles } from '../../utils/explore-link';
 import {
     createAlbumArtDragImage,
     createDragImage,
@@ -264,7 +265,7 @@ export class CoverGrid
     private splitEntriesCacheKey: GridEntry[] | null = null;
     private splitEntriesCacheIndex = -1;
 
-    static override styles = coverGridStyles;
+    static override styles = [coverGridStyles, exploreLinkStyles];
 
     /* ====================================================================
      * Reactive state
@@ -1832,7 +1833,7 @@ export class CoverGrid
                         class="artist-name"
                         title="${album.ArtistName}"
                     >
-                        ${album.ArtistName}
+                        ${artistLink(album.ArtistName, album.ArtistMBID ?? '')}
                     </div>
                 </div>
             </div>