The `uuid` module generates and validates UUIDs (Universally Unique Identifiers).

```vary
from uuid import v4, parse, is_valid

let id = v4()                           # e.g., "550e8400-e29b-41d4-a716-446655440000"
print(is_valid(id))                     # True
print(is_valid("not-a-uuid"))           # False

let validated = parse("550e8400-e29b-41d4-a716-446655440000").unwrap()
```

## Functions

| **Function** | **Returns** | **Description** |
|----------|-----------|-------------|
| `v4()` | `Str` | Generate a random UUID v4 string |
| `parse(s)` | `Result[Str, UuidError]` | Parse and validate a UUID string |
| `is_valid(s)` | `Bool` | Check whether a string is a valid UUID |