Fry3DX 0.4: an easy 3D modeller

Shapes with live settings, shape editing, knife and hole tools, drawing
shapes onto other objects, combining objects (add / subtract / overlap),
copies, thickness, painting with stickers and layers, a Layout tab, a
Print tab with checks, packed .fry files with autosave, export to GLB,
glTF, FBX, OBJ, 3MF, STL and PLY, folders in Layers, its own crash
screen, and a website for GitHub Pages in docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

engine/core/sysinfo.h

@@ -0,0 +1,21 @@
+#pragma once
+// What machine this is (the debug overlay's corner, crash reports): the OS, the CPU, memory.
+#include <cstdint>
+#include <string>
+
+namespace keel::sys {
+
+struct Machine {
+    std::string os;  // "NixOS 25.11 (Linux 6.18.54)", "Windows 11 (build 26100)"
+    std::string cpu; // "AMD Ryzen 7 5700G with Radeon Graphics"
+    int threads = 0;
+};
+const Machine& machine(); // (worked out once)
+
+struct Memory {
+    uint64_t total = 0, used = 0; // the whole machine's RAM (used: not available to programs)
+    uint64_t ours = 0;            // this process's resident memory
+};
+Memory memory();
+
+} // namespace keel::sys