feat: init mlkem project with Verilator test framework

- sync_rtl/common/: skid_buffer, pipeline_reg, defines (valid/ready)
- sync_rtl/mod_add/: modular adder example with Verilator C++ TB
- test_framework/: Python-driven Verilator compile/sim/compare pipeline
- test_framework/modules/mod_add/: 50-vector test plan, full鏈路 PASS
- .trellis/spec/: RTL and test_framework conventions documented

obj_dir/Vmod_add_sync___024root__Slow.cpp

@@ -0,0 +1,23 @@
+// Verilated -*- C++ -*-
+// DESCRIPTION: Verilator output: Design implementation internals
+// See Vmod_add_sync.h for the primary calling header
+
+#include "Vmod_add_sync__pch.h"
+
+void Vmod_add_sync___024root___ctor_var_reset(Vmod_add_sync___024root* vlSelf);
+
+Vmod_add_sync___024root::Vmod_add_sync___024root(Vmod_add_sync__Syms* symsp, const char* namep)
+ {
+    vlSymsp = symsp;
+    vlNamep = strdup(namep);
+    // Reset structure values
+    Vmod_add_sync___024root___ctor_var_reset(this);
+}
+
+void Vmod_add_sync___024root::__Vconfigure(bool first) {
+    (void)first;  // Prevent unused variable warning
+}
+
+Vmod_add_sync___024root::~Vmod_add_sync___024root() {
+    VL_DO_DANGLING(std::free(const_cast<char*>(vlNamep)), vlNamep);
+}