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/client-common/customextension.cpp

@@ -0,0 +1,137 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "customextension.h"
+#include <QtGui/QGuiApplication>
+#include <QtGui/QWindow>
+#include <QtGui/QPlatformSurfaceEvent>
+#include <QtGui/qpa/qplatformnativeinterface.h>
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+CustomExtension::CustomExtension()
+    : QWaylandClientExtensionTemplate(/* Supported protocol version */ 1 )
+{
+    connect(this, &CustomExtension::activeChanged, this, &CustomExtension::handleExtensionActive);
+}
+
+
+static inline struct ::wl_surface *getWlSurface(QWindow *window)
+{
+    void *surf = QGuiApplication::platformNativeInterface()->nativeResourceForWindow("surface", window);
+    return static_cast<struct ::wl_surface *>(surf);
+}
+
+QWindow *CustomExtension::windowForSurface(struct ::wl_surface *surface)
+{
+    for (QWindow *w : std::as_const(m_windows)) {
+        if (getWlSurface(w) == surface)
+            return w;
+    }
+    return nullptr;
+}
+
+bool CustomExtension::eventFilter(QObject *object, QEvent *event)
+{
+    if (event->type() == QEvent::Expose) {
+        QWindow *window = qobject_cast<QWindow*>(object);
+        Q_ASSERT(window);
+        if (window->isExposed()) {
+            window->removeEventFilter(this);
+            QtWayland::qt_example_extension::register_surface(getWlSurface(window));
+        }
+    }
+    return false;
+}
+
+void CustomExtension::sendWindowRegistration(QWindow *window)
+{
+    if (window->handle())
+        QtWayland::qt_example_extension::register_surface(getWlSurface(window));
+    else
+        window->installEventFilter(this); // register when created
+}
+
+void CustomExtension::registerWindow(QWindow *window)
+{
+    m_windows << window;
+    if (isActive()) {
+        m_activated = true;
+        sendWindowRegistration(window);
+    }
+}
+
+CustomExtensionObject *CustomExtension::createCustomObject(const QString &color, const QString &text)
+{
+    auto *obj = create_local_object(color, text);
+    return new CustomExtensionObject(obj, text);
+}
+
+//! [sendBounce]
+void CustomExtension::sendBounce(QWindow *window, uint ms)
+{
+    QtWayland::qt_example_extension::bounce(getWlSurface(window), ms);
+}
+//! [sendBounce]
+
+void CustomExtension::sendSpin(QWindow *window, uint ms)
+{
+    QtWayland::qt_example_extension::spin(getWlSurface(window), ms);
+}
+
+void CustomExtension::handleExtensionActive()
+{
+    if (isActive() && !m_activated) {
+        m_activated = true;
+        for (QWindow *w : std::as_const(m_windows))
+             sendWindowRegistration(w);
+    }
+}
+
+void CustomExtension::example_extension_close(wl_surface *surface)
+{
+    QWindow *w = windowForSurface(surface);
+    if (w)
+        w->close();
+}
+
+void CustomExtension::example_extension_set_font_size(wl_surface *surface, uint32_t pixel_size)
+{
+    emit fontSize(windowForSurface(surface), pixel_size);
+}
+
+void CustomExtension::example_extension_set_window_decoration(uint32_t state)
+{
+    bool shown = state;
+    for (QWindow *w : std::as_const(m_windows)) {
+        Qt::WindowFlags f = w->flags();
+        if (shown)
+            f &= ~Qt::FramelessWindowHint;
+        else
+            f |= Qt::FramelessWindowHint;
+        w->setFlags(f);
+    }
+}
+
+CustomExtensionObject::CustomExtensionObject(struct ::qt_example_local_object *wl_object, const QString &text)
+    : QWaylandClientExtensionTemplate<CustomExtensionObject>(1)
+    , QtWayland::qt_example_local_object(wl_object)
+    , m_text(text)
+{
+
+}
+
+void CustomExtensionObject::example_local_object_clicked()
+{
+    qDebug() << "Object clicked:" << m_text;
+    emit clicked();
+}
+
+void CustomExtensionObject::setText(const QString &text)
+{
+    m_text = text;
+    set_text(text);
+}
+
+QT_END_NAMESPACE

local/recipes/qt/qtwayland/source/examples/wayland/custom-extension/client-common/customextension.h

@@ -0,0 +1,87 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef CUSTOMEXTENSION_H
+#define CUSTOMEXTENSION_H
+
+#include <QtWaylandClient/QWaylandClientExtension>
+#include <QtGui/QWindow>
+#include <QtQmlIntegration/qqmlintegration.h>
+
+#include "qwayland-custom.h"
+
+QT_BEGIN_NAMESPACE
+
+class CustomExtensionObject;
+
+//! [CustomExtension]
+class CustomExtension : public QWaylandClientExtensionTemplate<CustomExtension>
+        , public QtWayland::qt_example_extension
+//! [CustomExtension]
+{
+    Q_OBJECT
+    QML_ELEMENT
+public:
+    CustomExtension();
+    Q_INVOKABLE void registerWindow(QWindow *window);
+
+    CustomExtensionObject *createCustomObject(const QString &color, const QString &text);
+
+public slots:
+    void sendBounce(QWindow *window, uint ms);
+    void sendSpin(QWindow *window, uint ms);
+
+signals:
+    void eventReceived(const QString &text, uint value);
+    void fontSize(QWindow *window, uint pixelSize);
+    void showDecorations(bool);
+
+private slots:
+    void handleExtensionActive();
+
+private:
+    void example_extension_close(wl_surface *surface) override;
+    void example_extension_set_font_size(wl_surface *surface, uint32_t pixel_size) override;
+    void example_extension_set_window_decoration(uint32_t state) override;
+
+    bool eventFilter(QObject *object, QEvent *event) override;
+
+    QWindow *windowForSurface(struct ::wl_surface *);
+    void sendWindowRegistration(QWindow *);
+
+    QList<QWindow *> m_windows;
+    bool m_activated = false;
+};
+
+class CustomExtensionObject : public QWaylandClientExtensionTemplate<CustomExtensionObject>
+        , public QtWayland::qt_example_local_object
+{
+    Q_OBJECT
+    Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)
+public:
+    CustomExtensionObject(struct ::qt_example_local_object *wl_object, const QString &text);
+
+    QString text() const
+    {
+        return m_text;
+    }
+
+protected:
+    void example_local_object_clicked() override;
+
+public slots:
+    void setText(const QString &text);
+
+signals:
+    void textChanged(const QString &text);
+    void clicked();
+
+private:
+    QString m_text;
+};
+
+
+
+QT_END_NAMESPACE
+
+#endif // CUSTOMEXTENSION_H