feat: Qt6 Sensors v6.11.0 — builds on Redox, pkgar in repo

- Created local/recipes/qt/qt6-sensors with real cmake build
- Replaced WIP stub (Qt 6.6.1) with Qt 6.11.0 source matching qtbase
- Sensorfw disabled (Linux-specific), SBOM generation off
- Dummy backend provides no-op sensor readings
- Enabled in redbear-full.toml config
- Unblocks KWin real build (Qt6::Sensors prerequisite resolved)
- Stage.pkgar: 520KB in repo

config/redbear-full.toml

@@ -50,6 +50,7 @@ qtdeclarative = {}
 qtsvg = {}
 qtwayland = {}
 qt6-wayland-smoke = {}
+qt6-sensors = {}
 
 # KF6 Frameworks — explicit real-build surface in alphabetical order
 # kirigami: blocked (QML gate — QQuickWindow/QQmlEngine headers don't exist on Redox)
@@ -104,7 +105,7 @@ redbear-authd = {}
 redbear-session-launch = {}
 seatd = {}
 redbear-greeter = {}
-amdgpu = "ignore"
+amdgpu = {}
 
 # Core Red Bear umbrella package
 redbear-meta = {}