Clarify plugin authoring and external dev workflow

packages/plugins/examples/plugin-authoring-smoke-example/rollup.config.mjs

@@ -0,0 +1,28 @@
+import { nodeResolve } from "@rollup/plugin-node-resolve";
+import typescript from "@rollup/plugin-typescript";
+import { createPluginBundlerPresets } from "@paperclipai/plugin-sdk/bundlers";
+
+const presets = createPluginBundlerPresets({ uiEntry: "src/ui/index.tsx" });
+
+function withPlugins(config) {
+  if (!config) return null;
+  return {
+    ...config,
+    plugins: [
+      nodeResolve({
+        extensions: [".ts", ".tsx", ".js", ".jsx", ".mjs"],
+      }),
+      typescript({
+        tsconfig: "./tsconfig.json",
+        declaration: false,
+        declarationMap: false,
+      }),
+    ],
+  };
+}
+
+export default [
+  withPlugins(presets.rollup.manifest),
+  withPlugins(presets.rollup.worker),
+  withPlugins(presets.rollup.ui),
+].filter(Boolean);