fix: comprehensive boot warnings and exceptions — fixable silenced, unfixable diagnosed

Build system (5 gaps hardened):
- COOKBOOK_OFFLINE defaults to true (fork-mode)
- normalize_patch handles diff -ruN format
- New 'repo validate-patches' command (25/25 relibc patches)
- 14 patched Qt/Wayland/display recipes added to protected list
- relibc archive regenerated with current patch chain

Boot fixes (fixable):
- Full ISO EFI partition: 16 MiB → 1 MiB (matches mini, BIOS hardcoded 2 MiB offset)
- D-Bus system bus: absolute /usr/bin/dbus-daemon path (was skipped)
- redbear-sessiond: absolute /usr/bin/redbear-sessiond path (was skipped)
- daemon framework: silenced spurious INIT_NOTIFY warnings for oneshot_async services (P0-daemon-silence-init-notify.patch)
- udev-shim: demoted INIT_NOTIFY warning to INFO (expected for oneshot_async)
- relibc: comprehensive named semaphores (sem_open/close/unlink) replacing upstream todo!() stubs
- greeterd: Wayland socket timeout 15s → 30s (compositor DRM wait)
- greeter-ui: built and linked (header guard unification, sem_compat stubs removed)
- mc: un-ignored in both configs, fixed glib/libiconv/pcre2 transitive deps
- greeter config: removed stale keymapd dependency from display/greeter services
- prefix toolchain: relibc headers synced, _RELIBC_STDLIB_H guard unified

Unfixable (diagnosed, upstream):
- i2c-hidd: abort on no-I2C-hardware (QEMU) — process::exit → relibc abort
- kded6/greeter-ui: page fault 0x8 — Qt library null deref
- Thread panics fd != -1 — Rust std library on Redox
- DHCP timeout / eth0 MAC — QEMU user-mode networking
- hwrngd/thermald — no hardware RNG/thermal in VM
- live preload allocation — BIOS memory fragmentation, continues on demand

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/qml-client/CMakeLists.txt

@@ -0,0 +1,65 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(custom-extension-qml-client)
+
+set(CMAKE_AUTOMOC ON)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/wayland/custom-extension/qml-client")
+
+find_package(Qt6 REQUIRED COMPONENTS Core GuiPrivate Qml Quick WaylandClient)
+
+qt6_policy(SET QTP0001 NEW)
+qt_add_executable(custom-extension-qml-client
+    ../client-common/customextension.cpp ../client-common/customextension.h
+    main.cpp
+)
+
+qt6_generate_wayland_protocol_client_sources(custom-extension-qml-client
+    FILES
+        ${CMAKE_CURRENT_SOURCE_DIR}/../protocol/custom.xml
+)
+
+set_target_properties(custom-extension-qml-client PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(custom-extension-qml-client PUBLIC
+    Qt::Core
+    Qt::Gui
+    Qt::GuiPrivate
+    Qt::Qml
+    Qt::Quick
+    Qt::WaylandClient
+)
+
+# Resources:
+set(qml_resource_files
+    "main.qml"
+)
+
+qt6_add_resources(custom-extension-qml-client "qml"
+    PREFIX
+        "/"
+    FILES
+        ${qml_resource_files}
+)
+
+target_include_directories(custom-extension-qml-client PUBLIC ../client-common/)
+
+qt6_add_qml_module(custom-extension-qml-client
+  URI io.qt.examples.customextension
+  VERSION 1.0
+)
+
+install(TARGETS custom-extension-qml-client
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/qml-client/main.cpp

@@ -0,0 +1,19 @@
+// Copyright (C) 2017 Erik Larsson.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtGui/QGuiApplication>
+#include <QtQml/QQmlApplicationEngine>
+#include <QtQml/QQmlEngine>
+
+#include "../client-common/customextension.h"
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
+
+    return app.exec();
+}
+

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/qml-client/main.qml

@@ -0,0 +1,91 @@
+// Copyright (C) 2017 Erik Larsson.
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import QtQuick
+import QtQuick.Window
+import io.qt.examples.customextension
+
+Window {
+    id: topLevelWindow
+    title: "QML Client"
+    visible: true
+    width: 800
+    height: 600
+
+    property real fontSize: height / 50
+
+    Column {
+        anchors.centerIn: parent
+        width: topLevelWindow.width / 4
+        height: 2 * (width + topLevelWindow.height / 12)
+        spacing: topLevelWindow.height / 12
+
+        Rectangle {
+            id: rect1
+            color: "#C0FFEE"
+            width: parent.width
+            height: width
+            clip: true
+
+            Text {
+                anchors.centerIn: parent
+                text: "Press here to send spin request."
+                font.pixelSize: fontSize
+                width: parent.width
+                height: parent.height
+                horizontalAlignment: Text.AlignHCenter
+                verticalAlignment: Text.AlignVCenter
+                wrapMode: Text.WrapAtWordBoundaryOrAnywhere
+            }
+
+            TapHandler {
+                onTapped: {
+                    if (customExtension.active)
+                        customExtension.sendSpin(topLevelWindow, 500)
+                }
+            }
+        }
+
+        Rectangle {
+            id: rect2
+            color: "#decaff"
+            width: parent.width
+            height: parent.height / 2
+            clip: true
+
+            Text {
+                anchors.centerIn: parent
+                text: "Press here to send bounce request."
+                font.pixelSize: fontSize
+                width: parent.width
+                height: parent.height
+                horizontalAlignment: Text.AlignHCenter
+                verticalAlignment: Text.AlignVCenter
+                wrapMode: Text.WrapAtWordBoundaryOrAnywhere
+            }
+
+//! [sendBounce]
+            TapHandler {
+                onTapped: {
+                    if (customExtension.active)
+                        customExtension.sendBounce(topLevelWindow, 1000)
+                }
+            }
+//! [sendBounce]
+        }
+    }
+
+//! [CustomExtension]
+    CustomExtension {
+        id: customExtension
+        onActiveChanged: {
+            registerWindow(topLevelWindow)
+        }
+        onFontSize: (window, pixelSize) => {
+            topLevelWindow.fontSize = pixelSize
+        }
+    }
+//! [CustomExtension]
+}
+

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/qml-client/qml-client.pro

@@ -0,0 +1,26 @@
+TEMPLATE = app
+QT += qml quick waylandclient gui-private
+CONFIG += wayland-scanner
+
+CONFIG += qmltypes
+QML_IMPORT_NAME = io.qt.examples.customextension
+QML_IMPORT_MAJOR_VERSION = 1
+
+INCLUDEPATH += $$PWD/../client-common
+
+WAYLANDCLIENTSOURCES += ../protocol/custom.xml
+
+SOURCES += main.cpp \
+    ../client-common/customextension.cpp
+
+HEADERS += \
+    ../client-common/customextension.h
+
+TARGET = custom-extension-qml-client
+
+RESOURCES += qml.qrc
+
+target.path = $$[QT_INSTALL_EXAMPLES]/wayland/custom-extension/qml-client
+INSTALLS += target
+
+

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/qml-client/qml.qrc

@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>