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/sql/sqlwidgetmapper/window.cpp

@@ -0,0 +1,130 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "window.h"
+
+#include <QComboBox>
+#include <QDataWidgetMapper>
+#include <QGridLayout>
+#include <QLabel>
+#include <QLineEdit>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QSqlQuery>
+#include <QSqlRelationalDelegate>
+#include <QSqlTableModel>
+#include <QTextEdit>
+
+//! [Set up widgets]
+Window::Window(QWidget *parent)
+    : QWidget(parent)
+{
+    setupModel();
+
+    nameLabel = new QLabel(tr("Na&me:"));
+    nameEdit = new QLineEdit();
+    addressLabel = new QLabel(tr("&Address:"));
+    addressEdit = new QTextEdit();
+    typeLabel = new QLabel(tr("&Type:"));
+    typeComboBox = new QComboBox();
+    nextButton = new QPushButton(tr("&Next"));
+    previousButton = new QPushButton(tr("&Previous"));
+
+    nameLabel->setBuddy(nameEdit);
+    addressLabel->setBuddy(addressEdit);
+    typeLabel->setBuddy(typeComboBox);
+//! [Set up widgets]
+
+//! [Set up the mapper]
+    QSqlTableModel *relModel = model->relationModel(typeIndex);
+    typeComboBox->setModel(relModel);
+    typeComboBox->setModelColumn(relModel->fieldIndex("description"));
+
+    mapper = new QDataWidgetMapper(this);
+    mapper->setModel(model);
+    mapper->setItemDelegate(new QSqlRelationalDelegate(this));
+    mapper->addMapping(nameEdit, model->fieldIndex("name"));
+    mapper->addMapping(addressEdit, model->fieldIndex("address"));
+    mapper->addMapping(typeComboBox, typeIndex);
+//! [Set up the mapper]
+
+//! [Set up connections and layouts]
+    connect(previousButton, &QPushButton::clicked,
+            mapper, &QDataWidgetMapper::toPrevious);
+    connect(nextButton, &QPushButton::clicked,
+            mapper, &QDataWidgetMapper::toNext);
+    connect(mapper, &QDataWidgetMapper::currentIndexChanged,
+            this, &Window::updateButtons);
+
+    QGridLayout *layout = new QGridLayout();
+    layout->addWidget(nameLabel, 0, 0, 1, 1);
+    layout->addWidget(nameEdit, 0, 1, 1, 1);
+    layout->addWidget(previousButton, 0, 2, 1, 1);
+    layout->addWidget(addressLabel, 1, 0, 1, 1);
+    layout->addWidget(addressEdit, 1, 1, 2, 1);
+    layout->addWidget(nextButton, 1, 2, 1, 1);
+    layout->addWidget(typeLabel, 3, 0, 1, 1);
+    layout->addWidget(typeComboBox, 3, 1, 1, 1);
+    setLayout(layout);
+
+    setWindowTitle(tr("SQL Widget Mapper"));
+    mapper->toFirst();
+}
+//! [Set up connections and layouts]
+
+//! [Set up the main table]
+void Window::setupModel()
+{
+    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName(":memory:");
+    if (!db.open()) {
+        QMessageBox::critical(0, tr("Cannot open database"),
+            tr("Unable to establish a database connection.\n"
+               "This example needs SQLite support. Please read "
+               "the Qt SQL driver documentation for information how "
+               "to build it."), QMessageBox::Cancel);
+        return;
+    }
+
+    QSqlQuery query;
+    query.exec("create table person (id int primary key, "
+               "name varchar(20), address varchar(200), typeid int)");
+    query.exec("insert into person values(1, 'Alice', "
+               "'<qt>123 Main Street<br/>Market Town</qt>', 101)");
+    query.exec("insert into person values(2, 'Bob', "
+               "'<qt>PO Box 32<br/>Mail Handling Service"
+               "<br/>Service City</qt>', 102)");
+    query.exec("insert into person values(3, 'Carol', "
+               "'<qt>The Lighthouse<br/>Remote Island</qt>', 103)");
+    query.exec("insert into person values(4, 'Donald', "
+               "'<qt>47338 Park Avenue<br/>Big City</qt>', 101)");
+    query.exec("insert into person values(5, 'Emma', "
+               "'<qt>Research Station<br/>Base Camp<br/>"
+               "Big Mountain</qt>', 103)");
+//! [Set up the main table]
+
+//! [Set up the address type table]
+    query.exec("create table addresstype (id int, description varchar(20))");
+    query.exec("insert into addresstype values(101, 'Home')");
+    query.exec("insert into addresstype values(102, 'Work')");
+    query.exec("insert into addresstype values(103, 'Other')");
+
+    model = new QSqlRelationalTableModel(this);
+    model->setTable("person");
+    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
+
+    typeIndex = model->fieldIndex("typeid");
+
+    model->setRelation(typeIndex,
+           QSqlRelation("addresstype", "id", "description"));
+    model->select();
+}
+//! [Set up the address type table]
+
+//! [Slot for updating the buttons]
+void Window::updateButtons(int row)
+{
+    previousButton->setEnabled(row > 0);
+    nextButton->setEnabled(row < model->rowCount() - 1);
+}
+//! [Slot for updating the buttons]