Initial commit: retroDE_ps2 — first-of-its-kind PS2 GS FPGA core (DE25-Nano / Agilex 5)

RTL (GS rasterizer, EE core stub, platform bridge, LPDDR4B path), sim regression
(272 TBs), docs, and tooling. Copyrighted PS2 content (BIOS, game code, GS dumps,
and all dump-derived textures/traces) is excluded via .gitignore and stays local.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sim/golden/dobiestation_runner/smoke_test.cpp

@@ -0,0 +1,13 @@
+// Minimal smoke test: construct + reset. No BIOS, no run.
+#include <cstdio>
+#include "emulator.hpp"
+
+int main()
+{
+    std::fprintf(stderr, "[smoke] constructing Emulator...\n");
+    Emulator e;
+    std::fprintf(stderr, "[smoke] constructed\n");
+    e.reset();
+    std::fprintf(stderr, "[smoke] reset done\n");
+    return 0;
+}