feat: VirtIO GPU driver, libdrm DRM ioctls, KWin/KF6 build fixes, display stack additions

- Add full VirtIO GPU driver with command submission, resource management,
  VirtQueue implementation, and transport layer; includes diagnostic probes
  for resource_create_2d ERR_INVALID_RESOURCE_ID investigation
- Expand libdrm Redox support with DRM ioctl wrappers (ADDFB, RMFB,
  CREATE_DUMB, MAP_DUMB, DESTROY_DUMB, GET_RESOURCES, GET_CONNECTOR,
  GET_CRTC, SET_CRTC, MODE_OBJ_GET_PROPERTIES, etc.) and xf86drm_redox.h
- Add redox-drm scheme handlers for VirtIO GPU-specific DRM ioctls
  (VIRTGPU_RESOURCE_CREATE, VIRTGPU_MAP, VIRTGPU_WAIT, VIRTGPU_INFO, etc.)
- Add display stack recipes: freetype2, lcms2, libdisplay-info, libepoxy,
  libxcvt
- Fix KWin build (recipe.toml expanded, kf6-ksvg added)
- Fix KF6 CMakeLists for cross-compilation (attica, kcmutils, kcolorscheme,
  kcompletion, kconfigwidgets, kdeclarative, kiconthemes, kitemmodels,
  kitemviews, kjobwidgets, ktextwidgets, kwayland, kxmlgui, kpty, solid)
- Add Qt6 futex support patch
- Add relibc patches: P3 strtold, P3 ld-so search path, P5 DRM ioctl removal
- Add base P4 pcid config scheme patch
- Update driver-manager hotplug/config, PCI config in redox-driver-sys
- Update greeter compositor and KDE session scripts
- Update AGENTS.md with zero-tolerance stubs policy and project knowledge

config/redbear-full.toml

@@ -47,14 +47,21 @@ numad = {}
 redox-drm = {}
 mesa = {}
 libdrm = {}
+libepoxy = {}
+libdisplay-info = {}
+libxcvt = {}
+lcms2 = {}
+freetype2 = {}
+fontconfig = {}
 
 libwayland = {}
 wayland-protocols = {}
-redbear-compositor = {}
+plasma-wayland-protocols = {}
+redbear-compositor = "ignore"  # replaced by kwin
 
 # Keyboard/input
-# libxkbcommon = {}  # build needed
-# xkeyboard-config = {}  # build needed
+libxkbcommon = {}
+xkeyboard-config = {}
 libevdev = {}
 libinput = {}
 redbear-keymapd = {}
@@ -93,7 +100,7 @@ kf6-kded6 = {}
 kf6-kguiaddons = {}
 kf6-ki18n = {}
 kf6-kiconthemes = {}
-kf6-kidletime = "ignore"
+kf6-kidletime = {}
 kf6-kitemmodels = {}
 kf6-kitemviews = {}
 kf6-kjobwidgets = {}
@@ -101,12 +108,14 @@ kf6-knotifications = {}
 kf6-kpackage = {}
 kf6-kservice = {}
 kf6-ktextwidgets = {}
-kf6-kwayland = "ignore"
+kf6-kwayland = {}
 kf6-kwidgetsaddons = {}
+kf6-kwindowsystem = {}
 kf6-kxmlgui = {}
 kf6-prison = {}
 kf6-solid = {}
 kf6-sonnet = {}
+kf6-ksvg = {}
 kf6-knewstuff = {}
 kf6-kwallet = {}
 kf6-kglobalaccel = {}
@@ -186,7 +195,7 @@ name = "redox-drm"
 description = "DRM/KMS display driver (AMD + Intel + VirtIO)"
 priority = 60
 command = ["/usr/bin/redox-drm"]
-depends_on = ["pci", "firmware", "iommu"]
+depends_on = ["pci"]
 
 [[driver.match]]
 class = 0x03
@@ -246,6 +255,21 @@ cmd = "/usr/bin/iommu"
 type = "oneshot_async"
 """
 
+[[files]]
+path = "/etc/init.d/14_redox-drm.service"
+data = """
+[unit]
+description = "DRM/KMS display driver (AMD + Intel + VirtIO)"
+requires_weak = [
+    "05_boot-essential.target",
+]
+
+[service]
+cmd = "/usr/bin/sh"
+args = ["-c", "if ! head -c 1 /scheme/drm/card0 >/dev/null 2>&1; then exec /usr/bin/redox-drm; fi; echo 'scheme:drm already registered, skipping'"]
+type = "oneshot_async"
+"""
+
 [[files]]
 path = "/etc/init.d/12_dbus.service"
 data = """
@@ -395,25 +419,6 @@ envs = { QT_PLUGIN_PATH = "/usr/plugins", QT_QPA_PLATFORM_PLUGIN_PATH = "/usr/pl
 type = "oneshot_async"
 """
 
-[[files]]
-path = "/etc/init.d/20_display.service"
-data = """
-[unit]
-description = "KDE session assembly helper"
-requires_weak = [
-    "12_dbus.service",
-    "13_redbear-sessiond.service",
-    "13_seatd.service",
-    "19_redbear-authd.service",
-]
-
-[service]
-cmd = "/usr/bin/redbear-session-launch"
-args = ["--username", "root", "--mode", "session", "--session", "kde-wayland", "--vt", "4", "--runtime-dir", "/tmp/run/redbear-display-session", "--wayland-display", "wayland-display"]
-envs = { QT_PLUGIN_PATH = "/usr/plugins", QT_QPA_PLATFORM_PLUGIN_PATH = "/usr/plugins/platforms", QML2_IMPORT_PATH = "/usr/qml", XCURSOR_THEME = "Pop", XKB_CONFIG_ROOT = "/usr/share/X11/xkb", REDBEAR_KDE_SESSION_BACKEND = "virtual", REDBEAR_KDE_SESSION_STATE_DIR = "/run/redbear-display-session" }
-type = "oneshot_async"
-"""
-
 [[files]]
 path = "/etc/init.d/20_greeter.service"
 data = """
@@ -421,6 +426,7 @@ data = """
 description = "Red Bear greeter service"
 requires_weak = [
     "00_driver-manager.service",
+    "14_redox-drm.service",
     "12_dbus.service",
     "13_redbear-sessiond.service",
     "13_seatd.service",