docs(docs): align stage ladder with API ladder constants

apps/docs/islands/ProgressDashboard.tsx

@@ -17,7 +17,9 @@ const API_BASE = "https://srs-api.prdlk.workers.dev";
 
 // ── /api/stats response shape ────────────────────────────────────
 
-const STAGES = ["new", "+2", "+5", "+10", "retired"] as const;
+// Mirrors STAGES in apps/api/src/srs.ts — the ladder rungs, in order. The
+// Worker ships every rung in `ladder`, zeros included.
+const STAGES = ["new", "+3", "+7", "retired"] as const;
 
 type Stage = (typeof STAGES)[number];