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.mk

@@ -0,0 +1,69 @@
+# Verilated -*- Makefile -*-
+# DESCRIPTION: Verilator output: Makefile for building Verilated archive or executable
+#
+# Execute this makefile from the object directory:
+#    make -f Vmod_add_sync.mk
+
+default: Vmod_add_sync
+
+### Constants...
+# Perl executable (from $PERL, defaults to 'perl' if not set)
+PERL = perl
+# Python3 executable (from $PYTHON3, defaults to 'python3' if not set)
+PYTHON3 = python3
+# Path to Verilator kit (from $VERILATOR_ROOT)
+VERILATOR_ROOT = /usr/share/verilator
+# SystemC include directory with systemc.h (from $SYSTEMC_INCLUDE)
+SYSTEMC_INCLUDE ?=
+# SystemC library directory with libsystemc.a (from $SYSTEMC_LIBDIR)
+SYSTEMC_LIBDIR ?=
+
+### Switches...
+# C++ code coverage  0/1 (from --prof-c)
+VM_PROFC = 0
+# SystemC output mode?  0/1 (from --sc)
+VM_SC = 0
+# Legacy or SystemC output mode?  0/1 (from --sc)
+VM_SP_OR_SC = $(VM_SC)
+# Deprecated
+VM_PCLI = 1
+# Deprecated: SystemC architecture to find link library path (from $SYSTEMC_ARCH)
+VM_SC_TARGET_ARCH = linux
+
+### Vars...
+# Design prefix (from --prefix)
+VM_PREFIX = Vmod_add_sync
+# Module prefix (from --prefix)
+VM_MODPREFIX = Vmod_add_sync
+# User CFLAGS (from -CFLAGS on Verilator command line)
+VM_USER_CFLAGS = \
+
+# User LDLIBS (from -LDFLAGS on Verilator command line)
+VM_USER_LDLIBS = \
+
+# User .cpp files (from .cpp's on Verilator command line)
+VM_USER_CLASSES = \
+  tb_mod_add \
+
+# User .cpp directories (from .cpp's on Verilator command line)
+VM_USER_DIR = \
+  .. \
+  ../sync_rtl/mod_add/TB \
+
+### Default rules...
+# Include list of all generated classes
+include Vmod_add_sync_classes.mk
+# Include global rules
+include $(VERILATOR_ROOT)/include/verilated.mk
+
+### Executable rules... (from --exe)
+VPATH += $(VM_USER_DIR)
+
+tb_mod_add.o: sync_rtl/mod_add/TB/tb_mod_add.cpp 
+	$(OBJCACHE) $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OPT_FAST)  -c -o $@ $<
+
+### Link rules... (from --exe)
+Vmod_add_sync: $(VK_USER_OBJS) $(VK_GLOBAL_OBJS) $(VM_PREFIX)__ALL.a
+	$(LINK) $(LDFLAGS) $^ $(LOADLIBES) $(LDLIBS) $(LIBS) $(SC_LIBS) -o $@
+
+# Verilated -*- Makefile -*-