Spoke should use promotion tokens when uploading files

Specify a `promotion_mode` of `with_token` when uploading to reticulum to retrieve a promotion token that you can then use when creating a scene

Trace the file-upload flow that sends uploads to reticulum and the subsequent scene-creation entry point. Verify how upload options are passed, then confirm that using promotion_mode with_token returns a promotion token and that the token is supplied when creating a scene. Validate the behavior with the relevant existing upload or scene tests, if present.

Written by the indexing model from the issue text.