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/hook.cpp

@@ -0,0 +1,62 @@
+#include "re/hook.h"
+
+#include <vector>
+
+#include <windows.h>
+#include <detours.h>
+
+#include "re/config.h"
+#include "re/log.h"
+
+namespace re {
+namespace {
+
+struct HookDef {
+    const char* name;
+    uint32_t address;
+    void** original;
+    void* replacement;
+};
+
+// Function-local static: registrations run during static initialisation, in
+// unspecified order across translation units.
+std::vector<HookDef>& Registry() {
+    static std::vector<HookDef> hooks;
+    return hooks;
+}
+
+} // namespace
+
+HookRegistration::HookRegistration(const char* name, uint32_t address, void** original, void* replacement) {
+    Registry().push_back({name, address, original, replacement});
+}
+
+int InstallHooks() {
+    int failed = 0;
+    int installed = 0;
+    for (const HookDef& hook : Registry()) {
+        if (!ConfigInt("hooks", hook.name, 1)) {
+            Log("hook %-24s 0x%08x  disabled by config", hook.name, hook.address);
+            continue;
+        }
+        // One transaction per hook, so a bad hook does not take the others down.
+        DetourTransactionBegin();
+        DetourUpdateThread(GetCurrentThread());
+        LONG error = DetourAttach(hook.original, hook.replacement);
+        if (error == NO_ERROR) {
+            error = DetourTransactionCommit();
+        } else {
+            DetourTransactionAbort();
+        }
+        if (error == NO_ERROR) {
+            ++installed;
+        } else {
+            ++failed;
+            Log("hook %-24s 0x%08x  FAILED (error %ld)", hook.name, hook.address, error);
+        }
+    }
+    Log("%d hook(s) installed, %d failed", installed, failed);
+    return failed;
+}
+
+} // namespace re