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

.trellis/spec/frontend/component-guidelines.md

@@ -0,0 +1,59 @@
+# Component Guidelines
+
+> How components are built in this project.
+
+---
+
+## Overview
+
+<!--
+Document your project's component conventions here.
+
+Questions to answer:
+- What component patterns do you use?
+- How are props defined?
+- How do you handle composition?
+- What accessibility standards apply?
+-->
+
+(To be filled by the team)
+
+---
+
+## Component Structure
+
+<!-- Standard structure of a component file -->
+
+(To be filled by the team)
+
+---
+
+## Props Conventions
+
+<!-- How props should be defined and typed -->
+
+(To be filled by the team)
+
+---
+
+## Styling Patterns
+
+<!-- How styles are applied (CSS modules, styled-components, Tailwind, etc.) -->
+
+(To be filled by the team)
+
+---
+
+## Accessibility
+
+<!-- A11y requirements and patterns -->
+
+(To be filled by the team)
+
+---
+
+## Common Mistakes
+
+<!-- Component-related mistakes your team has made -->
+
+(To be filled by the team)