feat: build system transition to release fork + archive hardening

Release fork infrastructure:
- REDBEAR_RELEASE=0.1.1 with offline enforcement (fetch/distclean/unfetch blocked)
- 195 BLAKE3-verified source archives in standard format
- Atomic provisioning via provision-release.sh (staging + .complete sentry)
- 5-phase improvement plan: restore format auto-detection, source tree
  validation (validate-source-trees.py), archive-map.json, REPO_BINARY fallback

Archive normalization:
- Removed 87 duplicate/unversioned archives from shared pool
- Regenerated all archives in consistent format with source/ + recipe.toml
- BLAKE3SUMS and manifest.json generated from stable tarball set

Patch management:
- verify-patches.sh: pre-sync dry-run report (OK/REVERSED/CONFLICT)
- 121 upstream-absorbed patches moved to absorbed/ directories
- 43 active patches verified clean against rebased sources
- Stress test: base updated to upstream HEAD, relibc reset and patched

Compilation fixes:
- relibc: Vec imports in redox-rt (proc.rs, lib.rs, sys.rs)
- relibc: unsafe from_raw_parts in mod.rs (2024 edition)
- fetch.rs: rev comparison handles short/full hash prefixes
- kibi recipe: corrected rev mismatch

New scripts: restore-sources.sh, provision-release.sh, verify-sources-archived.sh,
check-upstream-releases.sh, validate-source-trees.py, verify-patches.sh,
repair-archive-format.sh, generate-manifest.py

Documentation: AGENTS.md, README.md, local/AGENTS.md updated for release fork model

local/patches/qtbase/P0-remove-redox-linkat-unlinkat-stubs.patch

@@ -2,7 +2,7 @@ diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesys
 index e857f1a..f4f7f4a 100644
 --- a/src/corelib/io/qfilesystemengine_unix.cpp
 +++ b/src/corelib/io/qfilesystemengine_unix.cpp
-@@ -27,23 +27,6 @@
+@@ -27,22 +27,5 @@
  #include <stdio.h>
  #include <errno.h>
  

local/patches/qtbase/P0-remove-redox-linkat-unlinkat-stubs.patch.bak

@@ -0,0 +1,27 @@
+diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
+index e857f1a..f4f7f4a 100644
+--- a/src/corelib/io/qfilesystemengine_unix.cpp
++++ b/src/corelib/io/qfilesystemengine_unix.cpp
+@@ -27,23 +27,6 @@
+ #include <stdio.h>
+ #include <errno.h>
+ 
+-#ifdef Q_OS_REDOX
+-// relibc does not provide unlinkat/linkat yet (POSIX.1-2008 *at functions).
+-// Provide inline stubs that work for AT_FDCWD only - sufficient for
+-// FreeDesktop trash operations in this file.
+-#include <fcntl.h>
+-static inline int unlinkat(int dirfd, const char *pathname, int flags)
+-{
+-    if (dirfd != AT_FDCWD || flags != 0) { errno = ENOTSUP; return -1; }
+-    return unlink(pathname);
+-}
+-static inline int linkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, int flags)
+-{
+-    if (olddirfd != AT_FDCWD || newdirfd != AT_FDCWD || flags != 0) { errno = ENOTSUP; return -1; }
+-    return link(oldpath, newpath);
+-}
+-#endif
+-
+ #include <chrono>
+ #include <memory> // for std::unique_ptr

local/patches/qtbase/P1-qplatformopengl-guard.patch

@@ -16,7 +16,7 @@
  #if QT_CONFIG(opengl)
      virtual QOpenGLContext *createOpenGLContext(EGLContext context, EGLDisplay contextDisplay, QOpenGLContext *shareContext) const = 0;
      virtual QPlatformOffscreenSurface *createPlatformOffscreenSurface(QOffscreenSurface *surface) const { Q_UNUSED(surface); return nullptr; }
-@@ -65,7 +71,11 @@
+@@ -65,8 +71,12 @@
          EglContext
      };
      virtual void *nativeResource(NativeResource /*resource*/) { return nullptr; }

local/patches/qtbase/P1-qplatformopengl-guard.patch.bak

@@ -0,0 +1,56 @@
+--- qtb-orig/src/plugins/platforms/wayland/hardwareintegration/qwaylandclientbufferintegration_p.h	2026-03-05 07:51:49.000000000 +0000
++++ qtb-mod/src/plugins/platforms/wayland/hardwareintegration/qwaylandclientbufferintegration_p.h	2026-04-28 14:03:29.046092114 +0100
+@@ -51,9 +51,15 @@
+     virtual bool supportsThreadedOpenGL() const { return false; }
+     virtual bool supportsWindowDecoration() const { return false; }
+ 
++    #if QT_CONFIG(opengl)
++#if QT_CONFIG(opengl)
++#if QT_CONFIG(opengl)
+     virtual QWaylandWindow *createEglWindow(QWindow *window) = 0;
+     virtual QPlatformOpenGLContext *createPlatformOpenGLContext(const QSurfaceFormat &glFormat, QPlatformOpenGLContext *share) const = 0;
++#endif
++#endif
+     virtual bool canCreatePlatformOffscreenSurface() const { return false; }
++#endif
+ #if QT_CONFIG(opengl)
+     virtual QOpenGLContext *createOpenGLContext(EGLContext context, EGLDisplay contextDisplay, QOpenGLContext *shareContext) const = 0;
+     virtual QPlatformOffscreenSurface *createPlatformOffscreenSurface(QOffscreenSurface *surface) const { Q_UNUSED(surface); return nullptr; }
+@@ -65,7 +71,11 @@
+         EglContext
+     };
+     virtual void *nativeResource(NativeResource /*resource*/) { return nullptr; }
++#if QT_CONFIG(opengl)
++#if QT_CONFIG(opengl)
+     virtual void *nativeResourceForContext(NativeResource /*resource*/, QPlatformOpenGLContext */*context*/) { return nullptr; }
++#endif
++#endif
+ };
+ 
+ }
+--- qtb-orig/src/plugins/platforms/wayland/qwaylandintegration.cpp	2026-03-05 07:51:49.000000000 +0000
++++ qtb-mod/src/plugins/platforms/wayland/qwaylandintegration.cpp	2026-04-28 14:34:26.740450805 +0100
+@@ -135,17 +135,23 @@
+     case ScreenWindowGrabbing: // whether QScreen::grabWindow() is supported
+         return false;
+     case OffscreenSurface:
++#if QT_CONFIG(opengl)
+         return mDisplay->clientBufferIntegration()
+                 && mDisplay->clientBufferIntegration()->canCreatePlatformOffscreenSurface();
++#else
++        return false;
++#endif
+     default: return QPlatformIntegration::hasCapability(cap);
+     }
+ }
+ 
+ QPlatformWindow *QWaylandIntegration::createPlatformWindow(QWindow *window) const
+ {
++#if QT_CONFIG(opengl)
+     if (window->surfaceType() == QWindow::OpenGLSurface
+         && mDisplay->clientBufferIntegration())
+         return mDisplay->clientBufferIntegration()->createEglWindow(window);
++#endif
+ 
+ #if QT_CONFIG(vulkan)
+     if (window->surfaceType() == QSurface::VulkanSurface)

local/patches/qtbase/P2-enable-network-and-tuiotouch.patch

@@ -1,7 +1,7 @@
 diff -ruwN source-old/src/CMakeLists.txt source/src/CMakeLists.txt
 --- source-old/src/CMakeLists.txt	2024-12-02 05:39:06.000000000 +0000
 +++ source/src/CMakeLists.txt	2026-04-30 00:00:00.000000000 +0000
-@@ -54,5 +54,5 @@
+@@ -54,7 +54,7 @@
  endif()
  if (QT_FEATURE_network)
 -    # add_subdirectory(network) # disabled for Redox
@@ -12,7 +12,7 @@ diff -ruwN source-old/src/CMakeLists.txt source/src/CMakeLists.txt
 diff -ruwN source-old/src/plugins/generic/CMakeLists.txt source/src/plugins/generic/CMakeLists.txt
 --- source-old/src/plugins/generic/CMakeLists.txt	2024-12-02 05:39:06.000000000 +0000
 +++ source/src/plugins/generic/CMakeLists.txt	2026-04-30 00:00:00.000000000 +0000
-@@ -18,6 +18,6 @@
+@@ -18,7 +18,7 @@
      add_subdirectory(tslib)
  endif()
  if(QT_FEATURE_tuiotouch)

local/patches/qtbase/P2-enable-network-and-tuiotouch.patch.bak

@@ -0,0 +1,23 @@
+diff -ruwN source-old/src/CMakeLists.txt source/src/CMakeLists.txt
+--- source-old/src/CMakeLists.txt	2024-12-02 05:39:06.000000000 +0000
++++ source/src/CMakeLists.txt	2026-04-30 00:00:00.000000000 +0000
+@@ -54,5 +54,5 @@
+ endif()
+ if (QT_FEATURE_network)
+-    # add_subdirectory(network) # disabled for Redox
++    add_subdirectory(network)
+     if (ANDROID)
+         add_subdirectory(network/android/jar)
+     endif()
+diff -ruwN source-old/src/plugins/generic/CMakeLists.txt source/src/plugins/generic/CMakeLists.txt
+--- source-old/src/plugins/generic/CMakeLists.txt	2024-12-02 05:39:06.000000000 +0000
++++ source/src/plugins/generic/CMakeLists.txt	2026-04-30 00:00:00.000000000 +0000
+@@ -18,6 +18,6 @@
+     add_subdirectory(tslib)
+ endif()
+ if(QT_FEATURE_tuiotouch)
+-    # add_subdirectory(tuiotouch) # disabled for Redox (needs Network)
++    add_subdirectory(tuiotouch)
+ endif()
+ if(QT_FEATURE_libinput)
+     add_subdirectory(libinput)