refactor: route channel runtime via plugin api

src/auto-reply/command-detection.test.ts

@@ -1,8 +1,18 @@
-import { describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import { hasControlCommand, hasInlineCommandTokens } from "./command-detection.js";
 import { listChatCommands } from "./commands-registry.js";
 import { parseActivationCommand } from "./group-activation.js";
 import { parseSendPolicyCommand } from "./send-policy.js";
+import { setActivePluginRegistry } from "../plugins/runtime.js";
+import { createTestRegistry } from "../test-utils/channel-plugins.js";
+
+beforeEach(() => {
+  setActivePluginRegistry(createTestRegistry([]));
+});
+
+afterEach(() => {
+  setActivePluginRegistry(createTestRegistry([]));
+});
 
 describe("control command parsing", () => {
   it("requires slash for send policy", () => {