Automations should be able to use /orchestrate to access multiple repos

### Feature summary

Allow multiple repos for automation

### What problem are you trying to solve?

I have to choose a single repo when creating an automation. I can give it my own orchestration routine as part of the prompt but it would be better to just be able to select multiple repos for orchestration in the UI.

### Proposed solution

I would like to see the ability to select multiple repos for an automation like you can for a chat and have it run the /orchestrate skill to access all the repos and make changes as necessary.

### Workflow impact

Anyone who is in a multi repo environment (majority I suspect) and is trying to use the automations feature.

### Installation context

_No response_

### Additional context

_No response_

Start by tracing the automation creation UI and the existing /orchestrate workflow. Define how multiple repositories are selected and how the automation gains access to all of them, then verify the complete multi-repository automation flow works as described.

Written by the indexing model from the issue text.