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/vulkan/hellovulkancubes/camera.cpp

@@ -0,0 +1,65 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "camera.h"
+
+Camera::Camera(const QVector3D &pos)
+    : m_forward(0.0f, 0.0f, -1.0f),
+      m_right(1.0f, 0.0f, 0.0f),
+      m_up(0.0f, 1.0f, 0.0f),
+      m_pos(pos),
+      m_yaw(0.0f),
+      m_pitch(0.0f)
+{
+}
+
+static inline void clamp360(float *v)
+{
+    if (*v > 360.0f)
+        *v -= 360.0f;
+    if (*v < -360.0f)
+        *v += 360.0f;
+}
+
+void Camera::yaw(float degrees)
+{
+    m_yaw += degrees;
+    clamp360(&m_yaw);
+    m_yawMatrix.setToIdentity();
+    m_yawMatrix.rotate(m_yaw, 0, 1, 0);
+
+    QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
+    m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
+    m_right = (QVector4D(1.0f, 0.0f, 0.0f, 0.0f) * rotMat).toVector3D();
+}
+
+void Camera::pitch(float degrees)
+{
+    m_pitch += degrees;
+    clamp360(&m_pitch);
+    m_pitchMatrix.setToIdentity();
+    m_pitchMatrix.rotate(m_pitch, 1, 0, 0);
+
+    QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
+    m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
+    m_up = (QVector4D(0.0f, 1.0f, 0.0f, 0.0f) * rotMat).toVector3D();
+}
+
+void Camera::walk(float amount)
+{
+    m_pos[0] += amount * m_forward.x();
+    m_pos[2] += amount * m_forward.z();
+}
+
+void Camera::strafe(float amount)
+{
+    m_pos[0] += amount * m_right.x();
+    m_pos[2] += amount * m_right.z();
+}
+
+QMatrix4x4 Camera::viewMatrix() const
+{
+    QMatrix4x4 m = m_pitchMatrix * m_yawMatrix;
+    m.translate(-m_pos);
+    return m;
+}