Update CLAUDE.md: Document +621% performance improvement and accurate benchmark results

## Performance Summary

### Random Mixed 256B (10M iterations) - 3-way comparison
```
🥇 mimalloc:      107.11M ops/s  (fastest)
🥈 System malloc:  93.87M ops/s  (baseline)
🥉 HAKMEM:         65.24M ops/s  (69.5% of System, 60.9% of mimalloc)
```

**HAKMEM Improvement**: 9.05M → 65.24M ops/s (+621%!) 🚀

### Full Benchmark Comparison
```
Benchmark         │ HAKMEM      │ System malloc │ mimalloc     │ Rank
------------------+-------------+---------------+--------------+------
Random Mixed 256B │ 65.24M ops/s│ 93.87M ops/s  │ 107.11M ops/s│ 🥉 3rd
Fixed Size 256B   │ 41.95M ops/s│ 105.7M ops/s  │ -            │ ❌ Needs work
Mid-Large 8KB     │ 10.74M ops/s│ 7.85M ops/s   │ -            │ 🥇 1st (+37%)
```

## What Changed Today (2025-11-21~22)

### Bug Fixes
1. **C7 Stride Upgrade Fix**: Complete 1024B→2048B transition
   - Fixed local stride table omission
   - Disabled false positive NXT_MISALIGN checks
   - Removed redundant geometry validations

2. **C7 TLS SLL Corruption Fix**: Protected next pointer from user data overwrites
   - Changed C7 offset 1→0 (isolated next pointer from user-accessible area)
   - Limited header restoration to C1-C6 only
   - Removed premature slab release
   - **Result**: 100% corruption elimination (0 errors / 200K iterations) ✅

### Performance Optimizations (+621%!)
3. **Enabled 3 critical optimizations by default**:
   - `HAKMEM_SS_EMPTY_REUSE=1` - Empty slab reuse (syscall reduction)
   - `HAKMEM_TINY_UNIFIED_CACHE=1` - Unified TLS cache (hit rate improvement)
   - `HAKMEM_FRONT_GATE_UNIFIED=1` - Unified front gate (dispatch reduction)
   - **Result**: 9.05M → 65.24M ops/s (+621%!) 🚀

## Current Status

**Strengths**:
- ✅ Random Mixed: 65M ops/s (competitive, 3rd place)
- ✅ Mid-Large 8KB: 10.74M ops/s (beating System by 37%!)
- ✅ Stability: 100% corruption-free

**Needs Work**:
- ❌ Fixed Size 256B: 42M vs System 106M (2.5x slower)
- ⚠️ Larson MT: Needs investigation (stability)
- 📈 Gap to mimalloc: Need +64% to match (65M → 107M)

## Next Goals

1. **System malloc parity** (94M ops/s): Need +44% improvement
2. **mimalloc parity** (107M ops/s): Need +64% improvement
3. **Fixed Size optimization**: Investigate 10% regression

📊 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -15,12 +15,25 @@
 
 ### ベンチマーク結果（Random Mixed 256B, 10M iterations）
 ```
-HAKMEM (Current):    9.4M ops/s  (実測)
+🥇 mimalloc:      107.11M ops/s  (最速)
-System malloc:       89.0M ops/s (baseline)
+🥈 System malloc:  93.87M ops/s  (baseline)
-性能差:              9.5倍遅い (10.6% of target)
+🥉 HAKMEM:         65.24M ops/s  (System比 69.5%)
+
+HAKMEMの改善: 9.05M → 65.24M ops/s (+621%！) 🚀
 ```
 
-### 🔧 本日の修正（2025-11-21～22）
+### 全ベンチマーク比較
+```
+ベンチマーク          │ HAKMEM      │ System malloc │ mimalloc     │ 順位
+------------------+-------------+---------------+--------------+------
+Random Mixed 256B │ 65.24M ops/s│ 93.87M ops/s  │ 107.11M ops/s│ 🥉 3位
+Fixed Size 256B   │ 41.95M ops/s│ 105.7M ops/s  │ -            │ ❌ 要改善
+Mid-Large 8KB     │ 10.74M ops/s│ 7.85M ops/s   │ -            │ 🥇 1位 (+37%)
+```
+
+### 🔧 本日の修正と最適化（2025-11-21～22）
+
+**バグ修正**:
 1. **C7 Stride Upgrade Fix**: 1024B→2048B stride 移行の完全修正
    - Local stride table 更新漏れを発見・修正
    - False positive NXT_MISALIGN check を無効化
@@ -30,8 +43,14 @@ System malloc:       89.0M ops/s (baseline)
    - C7 offset を 1→0 に変更（next pointer を user accessible 領域外に隔離）
    - Header 復元を C1-C6 のみに限定
    - Premature slab release を削除
+   - **結果**: 100% corruption 除去（0 errors / 200K iterations）✅
 
-3. **結果**: 100% corruption 除去（0 errors / 200K iterations）✅
+**性能最適化** (+621%改善！):
+3. **3つの最適化をデフォルト有効化**:
+   - `HAKMEM_SS_EMPTY_REUSE=1` - 空slab再利用（syscall削減）
+   - `HAKMEM_TINY_UNIFIED_CACHE=1` - 統合TLSキャッシュ（hit rate向上）
+   - `HAKMEM_FRONT_GATE_UNIFIED=1` - 統合front gate（dispatch削減）
+   - **結果**: 9.05M → 65.24M ops/s (+621%！) 🚀
 
 ### 📊 性能測定の真実（ドキュメント誤記訂正）