Function isAutoGeneratedGuestName

isAutoGeneratedGuestName(name: string | null | undefined): boolean
Detect the placeholder display name muzieRTC's RoomSummaryManager writes when a guest joined a room without a real name set. The stored value follows the pattern Guest-<userId-substring-8>, which leaks unhelpful internal-id fragments into rendered summaries. Callers can detect it and fall back to getDisplayName on the underlying user id.
Parameters
- name: string | null | undefined
Returns boolean
Example
```
isAutoGeneratedGuestName('Guest-a1b2c3d4');  // true
isAutoGeneratedGuestName('Jane Smith');      // false
isAutoGeneratedGuestName(undefined);         // false
```
- Defined in packages/utilities/src/avatar.ts:140