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/qtbase/source/examples/qtestlib/tutorial4/CMakeLists.txt

@@ -0,0 +1,38 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(tutorial4 LANGUAGES CXX)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Test Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(tutorial4
+    testgui.cpp
+)
+
+set_target_properties(tutorial4 PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(tutorial4 PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Test
+    Qt6::Widgets
+)
+
+install(TARGETS tutorial4
+    BUNDLE  DESTINATION .
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+qt_generate_deploy_app_script(
+    TARGET tutorial4
+    OUTPUT_SCRIPT deploy_script
+    NO_UNSUPPORTED_PLATFORM_ERROR
+)
+install(SCRIPT ${deploy_script})

local/recipes/qt/qtbase/source/examples/qtestlib/tutorial4/testgui.cpp

@@ -0,0 +1,53 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+#include <QTest>
+
+//! [0]
+class TestGui: public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void testGui_data();
+    void testGui();
+};
+//! [0]
+
+//! [1]
+void TestGui::testGui_data()
+{
+    QTest::addColumn<QTestEventList>("events");
+    QTest::addColumn<QString>("expected");
+
+    QTestEventList list1;
+    list1.addKeyClick('a');
+    QTest::newRow("char") << list1 << "a";
+
+    QTestEventList list2;
+    list2.addKeyClick('a');
+    list2.addKeyClick(Qt::Key_Backspace);
+    QTest::newRow("there+back-again") << list2 << "";
+}
+//! [1]
+
+//! [2]
+void TestGui::testGui()
+{
+    QFETCH(QTestEventList, events);
+    QFETCH(QString, expected);
+
+    QLineEdit lineEdit;
+
+    events.simulate(&lineEdit);
+
+    QCOMPARE(lineEdit.text(), expected);
+}
+//! [2]
+
+//! [3]
+QTEST_MAIN(TestGui)
+#include "testgui.moc"
+//! [3]
+

local/recipes/qt/qtbase/source/examples/qtestlib/tutorial4/tutorial4.pro

@@ -0,0 +1,7 @@
+QT += widgets testlib
+
+SOURCES = testgui.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/qtestlib/tutorial4
+INSTALLS += target