docs(runtime): the listener-bag rule is Node parity plus patch independence, not a live crash

The wrapper-keyed-WeakMap corruption was a collector bug fixed in the
v8-14.9.207.39-6 prebuilts; the rule stays because own-instance state is
Node's design for handler attributes and keeps the builtins off the
resurrection/ephemeron interplay the kFinalizer patch must re-cover on
every V8 upgrade.

Author: edusperoni

NativeScript/runtime/js/README.md

@@ -117,11 +117,12 @@ The two extra rules a lazy builtin lives by:
   are whatever user code left behind, so it should not reach for them at all.
 - The per-instance wrappers `defineEventHandler` creates live on the target's
   **own listener bag**, under a private symbol — never in a WeakMap keyed by
-  the target. ObjectManager-registered wrappers may be resurrected by their
-  finalizer (the patched collector's `kFinalizer` mechanism), and a
-  resurrected ephemeron key is a known corruption hazard in the concurrent
-  marker — `Worker` has since moved to a strong-while-running lifetime, but
-  the rule protects against every other resurrectable wrapper type.
+  the target. Own-instance state is Node's own design for handler attributes,
+  and it keeps the builtins independent of the patched collector's handling of
+  resurrected ephemeron keys (`kFinalizer` resurrection interacting with
+  WeakMaps has been a source of collector bugs, and the patch is re-ported on
+  every V8 upgrade — builtins not leaning on it means a re-port mistake breaks
+  app-level tests, not the event system itself).
 - No `import`/`export` — these are classic function bodies, not modules.
 - ESLint (`eslint.config.mjs` at the repo root, run by lint-staged) declares
   `exports`, `require`, `module`, `binding`, `primordials` and the reachable