Alarms runs setName which doesn't exist if the Alarms class is used independently of the Actor class

**Describe the bug**
Alarms runs `setName` here: https://github.com/cloudflare/actors/blob/main/packages/alarms/src/index.ts#L301

The method doesn't exist if the alarms is used independently - the parent instance is not an actor instance.

**To Reproduce**
Steps to reproduce the behavior:

1. Use the alarms package without the actor class
2. Schedule an alarm
3. Wait for the alarm to run
4. Check console
5. `error setting identifier TypeError: this.parent.setName is not a function` appears in the console

**Expected behavior**
Everything works as expected

**Information (please complete the following information):**

- Typescript: [5.8.3]
- Node.js: [23.10.0]
- Wrangler: [4.30.0]
- Actor Version: [0.0.1-beta.6]

**Additional context**

Start at packages/alarms/src/index.ts around line 301 and reproduce the reported failure by using the alarms package without the Actor class, then scheduling an alarm. Done means the alarm runs without the `this.parent.setName is not a function` error and the expected behavior works for standalone use.

Written by the indexing model from the issue text.