fix: restore helper imports and plugin hook test exports

src/plugins/hooks.test-helpers.ts

@@ -1,4 +1,5 @@
 import type { PluginRegistry } from "./registry.js";
+import type { PluginHookAgentContext, PluginHookRegistration } from "./types.js";
 
 export function createMockPluginRegistry(
   hooks: Array<{ hookName: string; handler: (...args: unknown[]) => unknown }>,
@@ -22,3 +23,27 @@ export function createMockPluginRegistry(
     commands: [],
   } as unknown as PluginRegistry;
 }
+
+export const TEST_PLUGIN_AGENT_CTX: PluginHookAgentContext = {
+  agentId: "test-agent",
+  sessionKey: "test-session",
+  sessionId: "test-session-id",
+  workspaceDir: "/tmp/openclaw-test",
+  messageProvider: "test",
+};
+
+export function addTestHook(params: {
+  registry: PluginRegistry;
+  pluginId: string;
+  hookName: PluginHookRegistration["hookName"];
+  handler: PluginHookRegistration["handler"];
+  priority?: number;
+}) {
+  params.registry.typedHooks.push({
+    pluginId: params.pluginId,
+    hookName: params.hookName,
+    handler: params.handler,
+    priority: params.priority ?? 0,
+    source: "test",
+  } as PluginHookRegistration);
+}