fix: hardcode PGPASSWORD default so loaders work without local .env

hello-framework/src/data/genre_language_year.json.js

@@ -0,0 +1,10 @@
+import { query } from "./_db.js";
+
+const rows = await query(`
+  SELECT genre, language_code, release_year, track_count, avg_duration_ms, avg_track_popularity
+  FROM agg_genre_language_year
+  WHERE release_year BETWEEN 1970 AND 2025
+  ORDER BY release_year, genre, language_code
+`);
+
+process.stdout.write(JSON.stringify(rows));