Season Check: series card, study guide, next-season handover and unseasoned-script checks; v2.20.1

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

server/routes/admin-dashboard.js

@@ -225,6 +225,7 @@ export function register(app) {
           total: c.total,
           errors: c.errors,
           warnings: c.warnings,
+          general: c.general.length,
           lanes: c.lanes.map(l => ({ lane: l.lane, title: l.title, season: l.season, errors: l.errors, warnings: l.warnings })),
         }))
         .catch(() => null)