fix(subprocess): move SEA bootstrap to runtime packaging

python/sdk-runtime/runtime-bootstrap.mjs

@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+/** Private entry owned by the Python single-file runtime packaging. */
+
+const selectorName = 'DSH_SUBPROCESS_RUNNER'
+const selection = process.env[selectorName]
+
+if (selection === undefined) {
+  const { runCli } = await import('@deepseek-ai/dsh/lib/bin.js')
+  await runCli()
+} else {
+  Reflect.deleteProperty(process.env, selectorName)
+  const { runSelectedSubprocessRunner } = await import('@deepseek-ai/dsh-subprocess-local/runner')
+  await runSelectedSubprocessRunner(selection)
+}