🚨 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>

benchmark_real.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+echo "🚀 真のWASM実行性能ベンチマーク"
+echo "================================="
+
+# 実行回数
+ITERATIONS=100
+
+echo "📊 測定回数: $ITERATIONS"
+echo
+
+# 1. インタープリター測定
+echo "1️⃣ インタープリター実行測定"
+interpreter_total=0
+for i in $(seq 1 $ITERATIONS); do
+    start_time=$(date +%s%N)
+    ./target/release/nyash test_local_vars.nyash >/dev/null 2>&1
+    end_time=$(date +%s%N)
+    duration=$((($end_time - $start_time) / 1000000))  # ms
+    interpreter_total=$(($interpreter_total + $duration))
+done
+interpreter_avg=$(echo "scale=2; $interpreter_total / $ITERATIONS" | bc)
+echo "   平均実行時間: ${interpreter_avg} ms"
+
+# 2. VM測定  
+echo "2️⃣ VM実行測定"
+vm_total=0
+for i in $(seq 1 $ITERATIONS); do
+    start_time=$(date +%s%N)
+    ./target/release/nyash --backend vm test_local_vars.nyash >/dev/null 2>&1
+    end_time=$(date +%s%N)
+    duration=$((($end_time - $start_time) / 1000000))  # ms
+    vm_total=$(($vm_total + $duration))
+done
+vm_avg=$(echo "scale=2; $vm_total / $ITERATIONS" | bc)
+echo "   平均実行時間: ${vm_avg} ms"
+
+# 3. WASM実行測定（wasmtime）
+echo "3️⃣ WASM実行測定（wasmtime）"
+wasm_total=0
+for i in $(seq 1 $ITERATIONS); do
+    start_time=$(date +%s%N)
+    $HOME/.wasmtime/bin/wasmtime run bench_simple.wat --invoke main >/dev/null 2>&1
+    end_time=$(date +%s%N)
+    duration=$((($end_time - $start_time) / 1000000))  # ms
+    wasm_total=$(($wasm_total + $duration))
+done
+wasm_avg=$(echo "scale=2; $wasm_total / $ITERATIONS" | bc)
+echo "   平均実行時間: ${wasm_avg} ms"
+
+# 4. 結果比較
+echo
+echo "📈 性能比較結果"
+echo "==============="
+echo "インタープリター: ${interpreter_avg} ms (1x baseline)"
+echo "VM:              ${vm_avg} ms"
+echo "WASM (wasmtime): ${wasm_avg} ms"
+
+# 速度比計算
+vm_speedup=$(echo "scale=1; $interpreter_avg / $vm_avg" | bc)
+wasm_speedup=$(echo "scale=1; $interpreter_avg / $wasm_avg" | bc)
+
+echo
+echo "🏆 速度向上比較"
+echo "VM:              ${vm_speedup}x faster"
+echo "WASM:            ${wasm_speedup}x faster"