feat: Ranking Engine V2 — intelligent scoring with shares, authority, decay & velocity\n\n- Add ArtworkRankingService with V2 formula:\n ranking_score = (base × authority × decay) + velocity_boost\n Base: views×0.2 + downloads×1.5 + favourites×2.5 + comments×3.0 + shares×4.0\n Authority: 1 + (log10(1+followers) + fav_received/1000) × 0.05\n Decay: 1 / (1 + hours/48)\n Velocity: 24h signals × velocity_weights × 0.5\n\n- Add nova:recalculate-rankings command (--chunk, --sync-rank-scores, --skip-index)\n- Add migration: ranking_score, engagement_velocity, shares/comments counts to artwork_stats\n- Upgrade RankingService.computeScores() with shares + comments + velocity\n- Update Meilisearch sortableAttributes: ranking_score, shares_count, engagement_velocity, comments_count\n- Update toSearchableArray() to expose V2 fields\n- Schedule every 30 min with overlap protection\n- Verified: 49733 artworks scored successfully"

config/ranking.php

@@ -11,7 +11,7 @@ declare(strict_types=1);
 return [
 
     // ── Model versioning ────────────────────────────────────────────────────
-    'model_version' => 'rank_v1',
+    'model_version' => 'rank_v2',
 
     // ── Engagement signal weights (log-scaled) ──────────────────────────────
     'weights' => [
@@ -20,6 +20,36 @@ return [
         'downloads'  => 2.5,
     ],
 
+    // ── V2 ranking formula weights ──────────────────────────────────────────
+    'v2' => [
+        // Base engagement weights (linear, applied to raw counts)
+        'weights' => [
+            'views'      => 0.2,
+            'downloads'  => 1.5,
+            'favourites' => 2.5,
+            'comments'   => 3.0,
+            'shares'     => 4.0,   // highest — viral intent
+        ],
+
+        // 24h velocity weights
+        'velocity_weights' => [
+            'views'      => 1.0,
+            'favourites' => 3.0,
+            'comments'   => 4.0,
+            'shares'     => 5.0,
+        ],
+
+        // Velocity multiplier applied to the 24h velocity sum
+        'velocity_multiplier' => 0.5,
+
+        // Recency decay half-life in hours
+        'half_life' => 48,
+
+        // Author authority: multiplier = 1 + (authority * factor)
+        'authority_factor'      => 0.05,
+        'authority_fav_divisor' => 1000,
+    ],
+
     // ── Time-decay half-lives (hours) ───────────────────────────────────────
     'half_life' => [
         'trending'  => 72,   // Explore / global trending