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/sqlbrowser/main.cpp

@@ -0,0 +1,64 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "browser.h"
+
+#include <QApplication>
+#include <QDebug>
+#include <QMainWindow>
+#include <QMenu>
+#include <QMenuBar>
+#include <QSqlError>
+#include <QStatusBar>
+#include <QUrl>
+
+void addConnectionsFromCommandline(const QStringList &args, Browser *browser)
+{
+    for (qsizetype i = 1; i < args.count(); ++i) {
+        const auto &arg = args.at(i);
+        const QUrl url(arg, QUrl::TolerantMode);
+        if (!url.isValid()) {
+            qWarning("Invalid URL: %s", qPrintable(arg));
+            continue;
+        }
+        QSqlError err = browser->addConnection(url.scheme(), url.path().mid(1), url.host(),
+                                               url.userName(), url.password(), url.port(-1));
+        if (err.type() != QSqlError::NoError)
+            qDebug() << "Unable to open connection:" << err;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QMainWindow mainWin;
+    mainWin.setWindowTitle(QApplication::translate("MainWindow", "Qt SQL Browser"));
+
+    Browser browser(&mainWin);
+    mainWin.setCentralWidget(&browser);
+
+    QMenu *fileMenu = mainWin.menuBar()->addMenu(QObject::tr("&File"));
+    fileMenu->addAction(QApplication::translate("MainWindow", "Add &Connection..."),
+                        &browser, &Browser::openNewConnectionDialog);
+    fileMenu->addSeparator();
+    fileMenu->addAction(QApplication::translate("MainWindow", "&Quit"),
+                        qApp, &QApplication::quit);
+
+    QMenu *helpMenu = mainWin.menuBar()->addMenu(QObject::tr("&Help"));
+    helpMenu->addAction(QApplication::translate("MainWindow", "About"),
+                        &browser, &Browser::about);
+    helpMenu->addAction(QApplication::translate("MainWindow", "About Qt"),
+                        qApp, &QApplication::aboutQt);
+
+    QObject::connect(&browser, &Browser::statusMessage,
+                     &mainWin, [&mainWin](const QString &text) { mainWin.statusBar()->showMessage(text); });
+
+    addConnectionsFromCommandline(app.arguments(), &browser);
+    mainWin.show();
+    if (QSqlDatabase::connectionNames().isEmpty())
+        QMetaObject::invokeMethod(&browser, &Browser::openNewConnectionDialog,
+                                  Qt::QueuedConnection);
+
+    return app.exec();
+}