Windows guest VMI core: host library, CLI, guest agent

Static library over a flat RW mmap of guest RAM: GPA/GVA paging walks,
beacon-driven bootstrap, dynamic struct-offset profiling, process and
module enumeration, a region map, and value/pointer/signature scanners on
a shared windowed sweep. Public API in include/; internals under src/.

Thin CLI demonstrator over the public API. Guest agent cross-compiled to
Windows x86-64 via mingw-w64. CMake: static library + CLI + guest target,
C17.

src/include/contract.h

@@ -0,0 +1,27 @@
+#ifndef CONTRACT_MAGIC0
+#define CONTRACT_MAGIC0 0x3A7C1E94B2D6F058ull
+#endif
+
+#ifndef CONTRACT_MAGIC1
+#define CONTRACT_MAGIC1 0x9F41D80E6BC57A23ull
+#endif
+
+#ifndef CONTRACT_ACK
+#define CONTRACT_ACK 0xACED5EEDACED5EEDull
+#endif
+
+#ifndef W32MS_CONTRACT_H
+#define W32MS_CONTRACT_H
+
+#include <stdint.h>
+
+#pragma pack(push, 1)
+typedef struct {
+    uint64_t magic0;
+    uint64_t magic1;
+    uint64_t va_self;
+    uint64_t ack;
+} contract;
+#pragma pack(pop)
+
+#endif