Plugins: reserve context engine ownership

src/plugins/loader.test.ts

@@ -1082,6 +1082,71 @@ describe("loadOpenClawPlugins", () => {
     ).toBe(true);
   });
 
+  it("rejects plugin context engine ids reserved by core", () => {
+    useNoBundledPlugins();
+    const plugin = writePlugin({
+      id: "context-engine-core-collision",
+      filename: "context-engine-core-collision.cjs",
+      body: `module.exports = { id: "context-engine-core-collision", register(api) {
+  api.registerContextEngine("legacy", () => ({}));
+} };`,
+    });
+
+    const registry = loadRegistryFromSinglePlugin({
+      plugin,
+      pluginConfig: {
+        allow: ["context-engine-core-collision"],
+      },
+    });
+
+    expect(
+      registry.diagnostics.some(
+        (diag) =>
+          diag.level === "error" &&
+          diag.pluginId === "context-engine-core-collision" &&
+          diag.message === "context engine id reserved by core: legacy",
+      ),
+    ).toBe(true);
+  });
+
+  it("rejects duplicate plugin context engine ids", () => {
+    useNoBundledPlugins();
+    const first = writePlugin({
+      id: "context-engine-owner-a",
+      filename: "context-engine-owner-a.cjs",
+      body: `module.exports = { id: "context-engine-owner-a", register(api) {
+  api.registerContextEngine("shared-context-engine-loader-test", () => ({}));
+} };`,
+    });
+    const second = writePlugin({
+      id: "context-engine-owner-b",
+      filename: "context-engine-owner-b.cjs",
+      body: `module.exports = { id: "context-engine-owner-b", register(api) {
+  api.registerContextEngine("shared-context-engine-loader-test", () => ({}));
+} };`,
+    });
+
+    const registry = loadOpenClawPlugins({
+      cache: false,
+      config: {
+        plugins: {
+          load: { paths: [first.file, second.file] },
+          allow: ["context-engine-owner-a", "context-engine-owner-b"],
+        },
+      },
+    });
+
+    expect(
+      registry.diagnostics.some(
+        (diag) =>
+          diag.level === "error" &&
+          diag.pluginId === "context-engine-owner-b" &&
+          diag.message ===
+            "context engine already registered: shared-context-engine-loader-test (plugin:context-engine-owner-a)",
+      ),
+    ).toBe(true);
+  });
+
   it("requires plugin CLI registrars to declare explicit command roots", () => {
     useNoBundledPlugins();
     const plugin = writePlugin({