refactor(plugins): declare static runtime assets in package metadata

test/scripts/runtime-postbuild.test.ts

@@ -1,6 +1,7 @@
 import fs from "node:fs/promises";
 import path from "node:path";
 import { describe, expect, it, vi } from "vitest";
+import { discoverStaticExtensionAssets } from "../../scripts/lib/static-extension-assets.mjs";
 import {
   copyStaticExtensionAssets,
   listStaticExtensionAssetOutputs,
@@ -23,6 +24,37 @@ describe("runtime postbuild static assets", () => {
     );
   });
 
+  it("discovers static assets from plugin package metadata", async () => {
+    const rootDir = createTempDir("openclaw-runtime-postbuild-");
+    const packageDir = path.join(rootDir, "extensions", "demo");
+    await fs.mkdir(packageDir, { recursive: true });
+    await fs.writeFile(
+      path.join(packageDir, "package.json"),
+      JSON.stringify({
+        name: "@openclaw/demo",
+        openclaw: {
+          build: {
+            staticAssets: [
+              {
+                source: "./assets/runtime.js",
+                output: "assets/runtime.js",
+              },
+            ],
+          },
+        },
+      }),
+      "utf8",
+    );
+
+    expect(discoverStaticExtensionAssets({ rootDir })).toEqual([
+      {
+        pluginDir: "demo",
+        src: "extensions/demo/assets/runtime.js",
+        dest: "dist/extensions/demo/assets/runtime.js",
+      },
+    ]);
+  });
+
   it("copies declared static assets into dist", async () => {
     const rootDir = createTempDir("openclaw-runtime-postbuild-");
     const src = "extensions/acpx/src/runtime-internals/mcp-proxy.mjs";