Permanently delete a note. This operation is experimental.
Requires the `notes:write` scope.

See the [Notes guide](https://developers.buffer.com/guides/notes.md) for the complete workflow and error handling.

```graphql
mutation DeleteNote {
  deleteCollaborationNote(input: { noteId: "YOUR_NOTE_ID" }) {
    __typename
    ... on DeleteCollaborationNoteSuccess { noteId }
    ... on MutationError { message }
  }
}
```

Deletion cannot be undone. Ask the person to confirm before deleting.