refactor(test): share plugin hook registry helper

src/plugins/hooks.test-helpers.ts

@@ -0,0 +1,25 @@
+import type { PluginRegistry } from "./registry.js";
+
+export function createMockPluginRegistry(
+  hooks: Array<{ hookName: string; handler: (...args: unknown[]) => unknown }>,
+): PluginRegistry {
+  return {
+    hooks: hooks as never[],
+    typedHooks: hooks.map((h) => ({
+      pluginId: "test-plugin",
+      hookName: h.hookName,
+      handler: h.handler,
+      priority: 0,
+      source: "test",
+    })),
+    tools: [],
+    httpHandlers: [],
+    httpRoutes: [],
+    channelRegistrations: [],
+    gatewayHandlers: {},
+    cliRegistrars: [],
+    services: [],
+    providers: [],
+    commands: [],
+  } as unknown as PluginRegistry;
+}