Improve and validate PennyLane hybrid-mode support in HDH

[grageragarces]

I’d like to raise a discussion and request help with the current PennyLane support in HDH, specifically around hybrid (classical + quantum) workflows. My concern is that the existing converters and abstractions may not cover the full expressiveness or edge cases supported by PennyLane’s hybrid mode, and that someone familiar with PennyLane’s SDK and hybrid features could help audit, extend, and validate the implementation.