Add fresh CMake/platform scaffolding, core engine, and SDL3 window

Platform folders, cmake target/option/platform detection, Linux and PSP
scripts and Docker setup, assert/util/thread/error/log/perf/time/console/
engine/display modules, and an SDL3 window cleared to red.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

scripts/linux/build-docker.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")/../.."
+docker build -t dusk-linux -f docker/linux/Dockerfile .
+docker run --rm -v "$(pwd):/workdir" dusk-linux /bin/bash -c "./scripts/linux/build.sh"

scripts/linux/build.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")/../.."
+cmake -S . -B build-linux -DDUSK_TARGET_SYSTEM=linux
+cmake --build build-linux -- -j"$(nproc)"

scripts/linux/install.sh

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+#!/bin/bash
+# Installs the packages required to build and test Dusk on Linux.
+set -e
+
+SUDO=""
+if [ "$(id -u)" -ne 0 ]; then
+  SUDO="sudo"
+fi
+
+if command -v apt-get >/dev/null 2>&1; then
+  $SUDO apt-get update
+  $SUDO apt-get install -y \
+    build-essential \
+    cmake \
+    git \
+    python3 \
+    python3-pip \
+    python3-polib \
+    python3-pil \
+    python3-dotenv \
+    python3-numpy \
+    libsdl3-dev \
+    libvulkan-dev \
+    libzip-dev \
+    libbz2-dev \
+    liblzma-dev \
+    zlib1g-dev \
+    libssl-dev \
+    xz-utils
+elif command -v dnf >/dev/null 2>&1; then
+  $SUDO dnf install -y \
+    git make gcc cmake python python-polib python3-pillow python3-dotenv \
+    python3-numpy SDL2-devel mesa-libGL-devel zlib-devel libzip-devel \
+    bzip2-devel openssl-devel xz xz-devel
+elif command -v pacman >/dev/null 2>&1; then
+  $SUDO pacman -Sy --noconfirm --needed \
+    base-devel git cmake python python-polib python-pillow python-dotenv \
+    python-numpy sdl2 mesa libzip bzip2 openssl xz zlib
+else
+  echo "Unsupported package manager; install dependencies manually." >&2
+  exit 1
+fi

scripts/linux/test-docker.sh

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+#!/bin/bash
+set -e
+cd "$(dirname "$0")/../.."
+docker build -t dusk-linux -f docker/linux/Dockerfile .
+docker run --rm -v "$(pwd):/workdir" dusk-linux /bin/bash -c "./scripts/linux/test.sh"

scripts/linux/test.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")/../.."
+rm -rf build-tests
+cmake -S . -B build-tests -DDUSK_BUILD_TESTS=ON -DDUSK_TARGET_SYSTEM=linux
+cmake --build build-tests -- -j"$(nproc)"
+ctest --output-on-failure --test-dir build-tests