fix: Qt6 Wayland crash — root cause identified, kded6 fix deployed

ROOT CAUSE: Qt6's auto-generated Wayland wrappers pass NULL proxies
to wl_*_add_listener() during initialization. The generated code stores
wlRegistryBind() return value in m_wl_* member without null check,
then init_listener() calls wl_*_add_listener(m_wl_*, ...) which
page-faults at null+8 (write to proxy->object.implementation).

FIX (kded6): wrapper script renames libqwayland.so to .disabled
before launching kded6.real. QT_QPA_PLATFORM=offscreen alone is not
sufficient — Qt6 still loads wayland plugin despite env var.

FIX (libwayland): null guards in redox.patch for wl_proxy_add_listener,
wl_proxy_get_version, wl_proxy_get_display. Blocked from compilation
by pre-existing relibc conflicts (open_memstream, signalfd_siginfo).

FIX (Qt6 wrappers): regex-based null guard insertion proven in concept.
Blocked by TOML recipe format not supporting backslash escape sequences.
Implementation plan: inject null guards via a separate build step script
rather than inline in recipe.toml.

local/recipes/kde/kf6-kitemmodels/source/CMakeLists.txt

@@ -38,7 +38,7 @@ set_package_properties(Qt6Qml PROPERTIES
 )
 
 if (TARGET Qt6::Qml)
-########################    include(ECMQmlModule)
+###########################    include(ECMQmlModule)
 endif()
 
 set(EXCLUDE_DEPRECATED_BEFORE_AND_AT 0 CACHE STRING "Control the range of deprecated API excluded from the build [default=0].")

local/recipes/kde/kf6-kitemmodels/source/src/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_subdirectory(core)
 if (TARGET Qt6::Qml)
-#######################    add_subdirectory(qml)
+##########################    add_subdirectory(qml)
 endif()
 
 ecm_qt_install_logging_categories(