Specifying handoff tools in a squad requires UUID to function correctly

[siannopollo]

While the UUID is not being enforced when I push my squads, using a filename reference instead of a UUID to specify a handoff tool for an assistant results in a broken handoff inside the squad.

Here is an example from one of my squads:

members:
  - assistantId: house-laa-opener-qualifier-abc123
    assistantOverrides:
      tools:append:
        - async: false
          destinations:
            - assistantId: house-scheduling-handoff-bcd234
              assistantName: Practice Scheduling & Handoff
              type: assistant
          function:
            name: handoff_to_scheduling
          messages: []
          type: handoff

Specifying members.assistantId works as expected. members.assistantOverrides.tools:append, however, requires that destinations.assistantId be specified as a UUID and not a filename. If I use a filename instead of UUID it results in the handoff connections being broken in the squad (see attached screenshot).

My main branch is current up to commit e4653bb.