Initial sacred_re scaffold with borderless fullscreen mod

- Launcher (sacred_re.exe) starts sacred.exe with sacred_re.dll injected
  via Detours; the DLL verifies the Sacred Gold 2.28 build before hooking.
- Hook framework: RE_HOOK for game addresses, RE_HOOK_API for Windows
  APIs, per-hook enable/disable in sacred_re.ini, sacred_re.log.
- Game code: Log (0x66f1c0) hooked, CmdLineHasFlag (0x813140) rewritten.
- Borderless mod: forces windowed mode, covers the monitor, scales the
  1024x768 image aspect-correct, remaps mouse input, keeps running in the
  background with keyboard input hidden while unfocused.
- CMake/Ninja/MSVC x86 build, VS Code setup, disasm tool, function map.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/re/log.cpp

@@ -0,0 +1,45 @@
+#include "re/log.h"
+
+#include <cstdarg>
+#include <cstdio>
+#include <mutex>
+
+#include <windows.h>
+
+namespace re {
+namespace {
+
+std::mutex g_mutex;
+FILE* g_file = nullptr;
+
+} // namespace
+
+void OpenLog(const wchar_t* path) {
+    std::lock_guard lock(g_mutex);
+    if (!g_file) {
+        g_file = _wfsopen(path, L"w", _SH_DENYWR);
+    }
+}
+
+void Log(const char* fmt, ...) {
+    char message[1024];
+    va_list args;
+    va_start(args, fmt);
+    vsnprintf(message, sizeof(message), fmt, args);
+    va_end(args);
+
+    SYSTEMTIME t;
+    GetLocalTime(&t);
+    char line[1100];
+    snprintf(line, sizeof(line), "%02d:%02d:%02d.%03d %s\n", t.wHour, t.wMinute, t.wSecond, t.wMilliseconds,
+             message);
+
+    OutputDebugStringA(line);
+    std::lock_guard lock(g_mutex);
+    if (g_file) {
+        fputs(line, g_file);
+        fflush(g_file);
+    }
+}
+
+} // namespace re