test(perf): tighten reactive runtime size budget

scripts/security-performance-audit.mjs

@@ -169,7 +169,7 @@ addCheck(
  * minified transfer once. That is the number worth defending.
  */
 const runtimeBudgets = {
-  "reactive-runtime.ts": 80_000,
+  "reactive-runtime.ts": 71_000,
   "nav-runtime.ts": 12_000,
   "realtime-runtime.ts": 8_000,
 };