feat(code-runtime): execute Node programs through confined processes

python/sdk-runtime/runtime-bootstrap.mjs

@@ -4,7 +4,10 @@
 const selectorName = 'DSH_SUBPROCESS_RUNNER'
 const selection = process.env[selectorName]
 
-if (selection === undefined) {
+if (process.env.DSH_CODE_RUNTIME_NODE === '1') {
+  Reflect.deleteProperty(process.env, 'DSH_CODE_RUNTIME_NODE')
+  await import('@deepseek-ai/dsh-code-runtime-node/process')
+} else if (selection === undefined) {
   const { runCli } = await import('@deepseek-ai/dsh/lib/bin.js')
   await runCli()
 } else {