Rename task widget to todos

tests/prompt.test.ts

@@ -10,6 +10,38 @@ import {
 } from "../src/prompt.ts";
 import { TaskState } from "../src/state.ts";
 
+test("registers the conflict-free /todo command", async () => {
+  type RegisteredCommand = {
+    description: string;
+    handler(args: string, ctx: unknown): Promise<void>;
+  };
+  const commands = new Map<string, RegisteredCommand>();
+  const pi = {
+    on() {},
+    registerTool() {},
+    registerCommand(name: string, command: RegisteredCommand) {
+      commands.set(name, command);
+    },
+  };
+
+  piTodoHerdr(pi as never);
+
+  assert.deepEqual([...commands.keys()], ["todo"]);
+  const todo = commands.get("todo");
+  assert.equal(todo?.description, "Show or hide the todo tree widget");
+
+  const notifications: string[] = [];
+  await todo?.handler("", {
+    ui: {
+      setWidget() {},
+      notify(message: string) {
+        notifications.push(message);
+      },
+    },
+  });
+  assert.deepEqual(notifications, ["No todos yet."]);
+});
+
 test("keeps task guidance short with planning after exploration", () => {
   assert.equal(TASK_PROMPT_GUIDELINES.length, 2);
   const prompt = TASK_PROMPT_GUIDELINES.join("\n");