feat: add C++ support with ImGui/ImPlot framework and vendor submodules

Añade soporte C++ al registry: vendor submodules (glfw, imgui, implot, tracy),
sistema de build con CMake y toolchains cross-platform, runner C++ en fn CLI,
parser de tests Google Test, y funciones bash para build Linux/Windows.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bash/functions/infra/install_cpp_deps.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "[install_cpp_deps] Checking C++ build dependencies..."
+
+MISSING=()
+
+if ! command -v cmake &>/dev/null; then
+    MISSING+=(cmake)
+else
+    echo "  cmake: $(cmake --version | head -1)"
+fi
+
+if ! command -v g++ &>/dev/null; then
+    MISSING+=(g++ build-essential)
+else
+    echo "  g++: $(g++ --version | head -1)"
+fi
+
+if ! dpkg -s libglfw3-dev &>/dev/null 2>&1; then
+    MISSING+=(libglfw3-dev)
+else
+    echo "  libglfw3-dev: installed"
+fi
+
+if ! dpkg -s libgl1-mesa-dev &>/dev/null 2>&1; then
+    MISSING+=(libgl1-mesa-dev)
+else
+    echo "  libgl1-mesa-dev: installed"
+fi
+
+# Optional: mingw for cross-compile
+if command -v x86_64-w64-mingw32-g++ &>/dev/null; then
+    echo "  mingw-w64: $(x86_64-w64-mingw32-g++ --version | head -1)"
+else
+    echo "  mingw-w64: not installed (optional, for Windows cross-compile)"
+fi
+
+if [ ${#MISSING[@]} -eq 0 ]; then
+    echo "[install_cpp_deps] All dependencies satisfied."
+    exit 0
+fi
+
+echo ""
+echo "[install_cpp_deps] Missing packages: ${MISSING[*]}"
+echo "[install_cpp_deps] Installing..."
+sudo apt-get update -qq
+sudo apt-get install -y -qq "${MISSING[@]}"
+echo "[install_cpp_deps] Done."