fix(code-runtime): separate model environment from native startup paths

packages/code-runtime/code-runtime-node/src/environment.ts

@@ -0,0 +1,4 @@
+/** Startup variables required by native executables before model evaluation. */
+
+/** Native executable search and Windows system paths retained in the OS environment. */
+export const STARTUP_ENVIRONMENT_NAMES: ReadonlySet<string> = new Set(['PATH', 'PATHEXT', 'SYSTEMROOT', 'WINDIR'])