v3.19.3 — Externalize isolated-vm from introspection builds

Fixed

• Native addon bundling crash — \�urb validate\ and \�urb deploy\ introspection builds failed when \isolated-vm\ (an optional peerDependency used by \SandboxEngine) was present in the dependency tree (e.g., via
  pm link\ during development). esbuild cannot bundle .node\ native binaries. Added \external: ['isolated-vm']\ to the introspection esbuild config in both \introspect.ts\ and \deploy.ts. This is not a breaking change — \isolated-vm\ is lazy-loaded via
  equire()\ with a try/catch fallback.

Test Suite

• 6805 tests passing across 330 test files — zero regressions