- get_data_device: stores wl_data_device in client object map
- get_subsurface: stores wl_subsurface in client object map
- data_device/subsurface requests accepted silently (Qt6 needs
these proxies to exist for initialization even though we don't
implement clipboard or subsurface compositing yet)
Instrumentation confirmed: setupConnection() completes with valid
registry=0x44f230. Crash is in Qt6 global binding path during
forceRoundTrip(), not in compositor protocol handling.
vasilito
6a5f569a27