fix(build): unblock pnpm build dts

scripts/write-plugin-sdk-entry-dts.ts

@@ -0,0 +1,9 @@
+import fs from "node:fs";
+import path from "node:path";
+
+// `tsc` emits the entry d.ts at `dist/plugin-sdk/plugin-sdk/index.d.ts` because
+// the source lives at `src/plugin-sdk/index.ts` and `rootDir` is `src/`.
+// Keep a stable `dist/plugin-sdk/index.d.ts` alongside `index.js` for TS users.
+const out = path.join(process.cwd(), "dist/plugin-sdk/index.d.ts");
+fs.mkdirSync(path.dirname(out), { recursive: true });
+fs.writeFileSync(out, 'export * from "./plugin-sdk/index";\n', "utf8");