Plugin SDK: add full bundled subpath wiring

src/plugin-sdk/talk-voice.ts

@@ -0,0 +1,4 @@
+// Narrow plugin-sdk surface for the bundled talk-voice plugin.
+// Keep this list additive and scoped to symbols used under extensions/talk-voice.
+
+export type { OpenClawPluginApi } from "../plugins/types.js";