### `Job`
Represents a script execution request with:
- Unique ID and timestamps
- Script content and target actor
- Execution settings (timeout, retries, concurrency)
- Logging configuration

### `JobBuilder`
Fluent builder for configuring jobs:
- `script()` - Set the script content
- `actor_id()` - Target specific actor
- `timeout()` - Set execution timeout
- `build()` - Create the job
- `submit()` - Fire-and-forget submission
- `await_response()` - Submit and wait for result