🚨 Critical Issue #76: SocketBox Method Call Deadlock Investigation

## 🎯 Problem Identification Complete
- SocketBox method calls (bind, isServer, toString) cause infinite blocking
- Root cause: Method resolution pipeline deadlock before execute_socket_method
- Other Box types (ArrayBox, StringBox, MapBox) work normally
- Arc<Mutex> reference sharing confirmed working (Arc addresses match = true)

## 🔧 Debug Infrastructure Added
- Comprehensive debug logging in socket_box.rs (bind, isServer, clone, toString)
- Method call tracing in http_methods.rs
- Deadlock detection points identified at interpreter expressions.rs:462-464

## 📋 Issue #76 Created for Copilot Investigation
- Systematic root cause analysis requirements (Architecture→Parser→Runtime levels)
- Comprehensive test cases: minimal/comprehensive/comparison scenarios
- Strict prohibition of band-aid fixes - architectural analysis required
- Hypothesis: Multiple Arc<Mutex> combinations causing circular deadlock

## 🧪 Test Suite Added
- test_socket_deadlock_minimal.nyash: Minimal reproduction case
- test_socket_methods_comprehensive.nyash: All methods deadlock verification
- test_other_boxes_working.nyash: Normal Box operation confirmation
- SOCKETBOX_ISSUE_REPRODUCTION.md: Complete reproduction guide

## 📊 Impact Assessment
- Phase 9 HTTP server implementation completely blocked
- SocketBox functionality entirely non-functional
- Critical blocker for production readiness
- Requires immediate systematic investigation

🔥 Generated with [Claude Code](https://claude.ai/code)

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

test_runner.js

@@ -0,0 +1,47 @@
+// Node.js用WASM実行テストランナー
+const fs = require('fs');
+
+async function runWasm() {
+    try {
+        // WASMバイナリ読み込み
+        const wasmBuffer = fs.readFileSync('test_local_vars.wasm');
+        
+        // Import関数定義
+        const importObject = {
+            env: {
+                print: (value) => {
+                    console.log(`WASM print: ${value}`);
+                }
+            }
+        };
+        
+        // WASM インスタンス作成・実行
+        const wasmModule = await WebAssembly.instantiate(wasmBuffer, importObject);
+        
+        console.log('🌐 WASM module loaded successfully!');
+        
+        // main関数実行
+        const startTime = performance.now();
+        const result = wasmModule.instance.exports.main();
+        const endTime = performance.now();
+        
+        console.log(`🏆 WASM Execution Result: ${result}`);
+        console.log(`⚡ WASM Execution Time: ${(endTime - startTime).toFixed(3)} ms`);
+        
+        return {
+            result: result,
+            executionTime: endTime - startTime
+        };
+        
+    } catch (error) {
+        console.error('❌ WASM execution error:', error);
+        return null;
+    }
+}
+
+// 実行
+runWasm().then(result => {
+    if (result) {
+        console.log(`✅ Test completed - Result: ${result.result}, Time: ${result.executionTime.toFixed(3)}ms`);
+    }
+});