circup API?

Hello!

I created a tool a few years ago that uses some non-public methods from `circup` (basically just device folder detection). When updating it recently I had to make changes as `circup`'s internal code had changed.

The tool is [circdeploy](https://github.com/plasticrake/circdeploy) that copies project files from a code folder to a device. (I don't like editing the device files directly)

1. Would it be possible to expose an official `circup` API that my tool could use instead of relying on non-public methods that may change?
2. Or alternatively is the functionality in `circdeploy` something that you would be interested in having adding to `circup`?
3. I'm pretty sure nobody but me uses `circdeploy`, as I've never advertised it. So I guess this is its debut!

Cheers!

Start by reviewing the linked circdeploy project and the circup non-public methods it uses for device folder detection. Determine whether an official API or circup integration is the better direction, then document the chosen scope and acceptance criteria. Done means maintainers have agreed on a concrete path for supporting this workflow.

Written by the indexing model from the issue text.