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

.claude/settings.json

@@ -0,0 +1,73 @@
+{
+  "env": {
+    "CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR": "1"
+  },
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/session-start.py",
+            "timeout": 30
+          }
+        ]
+      },
+      {
+        "matcher": "clear",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/session-start.py",
+            "timeout": 30
+          }
+        ]
+      },
+      {
+        "matcher": "compact",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/session-start.py",
+            "timeout": 30
+          }
+        ]
+      }
+    ],
+    "PreToolUse": [
+      {
+        "matcher": "Task",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/inject-subagent-context.py",
+            "timeout": 30
+          }
+        ]
+      },
+      {
+        "matcher": "Agent",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/inject-subagent-context.py",
+            "timeout": 30
+          }
+        ]
+      }
+    ],
+    "UserPromptSubmit": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 .claude/hooks/inject-workflow-state.py",
+            "timeout": 15
+          }
+        ]
+      }
+    ]
+  },
+  "enabledPlugins": {}
+}