PHLEGM v8 live CFG synchronization fix

- Passing End-User build cloning now merge-copies the Developer source cfg/ tree into the resolved live install cfg/ tree.
- This synchronization is independent of the Include CFG Data packaging option.
- Matching live CFG files are replaced; unrelated destination files remain intact.
- Build-architecture validation now rejects machine descriptors without machine_class=computer or machine_class=console.
- All 26 machine descriptors in this distribution pass the machine_class audit.
