Is there any facility built into (any version) or planned for the future within Adagio AI (preferred) and/or AR (probably not applicable) for processing CC's and posting directly to invoices?

Currently this is not available but all of the components to make this work are in Adagio, the only thing missing is to program the necessary file layout required by your bank.

I may be possible to ask Softrak to implement this on a cost recovery bases. You should get in touch with your Adagio dealer to arrange a quote.