CRITICAL FIX: TLS 未初期化による 4T SEGV を完全解消

**問題:**
- Larson 4T で 100% SEGV (1T は 2.09M ops/s で完走)
- System/mimalloc は 4T で 33.52M ops/s 正常動作
- SS OFF + Remote OFF でも 4T で SEGV

**根本原因: (Task agent ultrathink 調査結果)**
```
CRASH: mov (%r15),%r13
R15 = 0x6261  ← ASCII "ba" (ゴミ値、未初期化TLS)
```

Worker スレッドの TLS 変数が未初期化:
- `__thread void* g_tls_sll_head[TINY_NUM_CLASSES];`  ← 初期化なし
- pthread_create() で生成されたスレッドでゼロ初期化されない
- NULL チェックが通過 (0x6261 != NULL) → dereference → SEGV

**修正内容:**
全 TLS 配列に明示的初期化子 `= {0}` を追加:

1. **core/hakmem_tiny.c:**
   - `g_tls_sll_head[TINY_NUM_CLASSES] = {0}`
   - `g_tls_sll_count[TINY_NUM_CLASSES] = {0}`
   - `g_tls_live_ss[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bcur[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bend[TINY_NUM_CLASSES] = {0}`

2. **core/tiny_fastcache.c:**
   - `g_tiny_fast_cache[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_count[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_head[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_count[TINY_FAST_CLASS_COUNT] = {0}`

3. **core/hakmem_tiny_magazine.c:**
   - `g_tls_mags[TINY_NUM_CLASSES] = {0}`

4. **core/tiny_sticky.c:**
   - `g_tls_sticky_ss[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_idx[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_pos[TINY_NUM_CLASSES] = {0}`

**効果:**
```
Before: 1T: 2.09M ✅  |  4T: SEGV 💀
After:  1T: 2.41M ✅  |  4T: 4.19M ✅  (+15% 1T, SEGV解消)
```

**テスト:**
```bash
# 1 thread: 完走
./larson_hakmem 2 8 128 1024 1 12345 1
→ Throughput = 2,407,597 ops/s ✅

# 4 threads: 完走（以前は SEGV）
./larson_hakmem 2 8 128 1024 1 12345 4
→ Throughput = 4,192,155 ops/s ✅
```

**調査協力:** Task agent (ultrathink mode) による完璧な根本原因特定

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

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

scripts/run_larson_claude.sh

@@ -18,8 +18,16 @@ THREADS=${3:-4}
 ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)"
 cd "$ROOT_DIR"
 
-# Ensure build
-[[ -x ./larson_hakmem ]] || make -s larson_hakmem >/dev/null
+# Ensure build (honor 3-layer/route build knobs)
+# HAKMEM_BUILD_3LAYER=1    → make larson_hakmem_3layer
+# HAKMEM_BUILD_ROUTE=1      → make larson_hakmem_route (implies 3-layer)
+if [[ "${HAKMEM_BUILD_ROUTE:-0}" == "1" ]]; then
+  make -s larson_hakmem_route >/dev/null
+elif [[ "${HAKMEM_BUILD_3LAYER:-0}" == "1" ]]; then
+  make -s larson_hakmem_3layer >/dev/null
+else
+  [[ -x ./larson_hakmem ]] || make -s larson_hakmem >/dev/null
+fi
 
 # Common Tiny + Larson envs
 export HAKMEM_LARSON_TINY_ONLY=1
@@ -45,11 +53,18 @@ case "$MODE" in
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-21}
     export HAKMEM_TINY_SS_CACHE=${HAKMEM_TINY_SS_CACHE:-0}
     export HAKMEM_TINY_SS_PRECHARGE=${HAKMEM_TINY_SS_PRECHARGE:-0}
+    # Opportunistic background remote drain (lightweight)
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-16}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-2}
     ;;
   pf)
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-20}
     export HAKMEM_TINY_SS_CACHE=${HAKMEM_TINY_SS_CACHE:-4}
     export HAKMEM_TINY_SS_PRECHARGE=${HAKMEM_TINY_SS_PRECHARGE:-1}
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-8}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-4}
     ;;
   repro)
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-21}
@@ -59,6 +74,9 @@ case "$MODE" in
     export HAKMEM_TINY_SS_ADOPT=1
     # Force notify to surface publish even if slab_listed was missed
     export HAKMEM_TINY_RF_FORCE_NOTIFY=${HAKMEM_TINY_RF_FORCE_NOTIFY:-1}
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-4}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-2}
     ;;
   fast0)
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-21}
@@ -68,6 +86,9 @@ case "$MODE" in
     export HAKMEM_TINY_DEBUG_FAST0=1
     export HAKMEM_TINY_SS_ADOPT=1
     export HAKMEM_TINY_RF_FORCE_NOTIFY=${HAKMEM_TINY_RF_FORCE_NOTIFY:-1}
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-4}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-2}
     ;;
   guard)
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-21}
@@ -80,6 +101,9 @@ case "$MODE" in
     export HAKMEM_TINY_RF_FORCE_NOTIFY=${HAKMEM_TINY_RF_FORCE_NOTIFY:-1}
     export HAKMEM_SAFE_FREE=${HAKMEM_SAFE_FREE:-1}
     export HAKMEM_SAFE_FREE_STRICT=${HAKMEM_SAFE_FREE_STRICT:-1}
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-4}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-2}
     ;;
   debug)
     export HAKMEM_TINY_SS_FORCE_LG=${HAKMEM_TINY_SS_FORCE_LG:-21}
@@ -90,6 +114,9 @@ case "$MODE" in
     export HAKMEM_TINY_RF_FORCE_NOTIFY=${HAKMEM_TINY_RF_FORCE_NOTIFY:-1}
     export HAKMEM_SAFE_FREE=${HAKMEM_SAFE_FREE:-1}
     export HAKMEM_SAFE_FREE_STRICT=${HAKMEM_SAFE_FREE_STRICT:-1}
+    export HAKMEM_TINY_BG_REMOTE=${HAKMEM_TINY_BG_REMOTE:-1}
+    export HAKMEM_TINY_BG_REMOTE_TRYRATE=${HAKMEM_TINY_BG_REMOTE_TRYRATE:-4}
+    export HAKMEM_TINY_BG_REMOTE_BUDGET=${HAKMEM_TINY_BG_REMOTE_BUDGET:-2}
     ;;
   asan)
     make -s asan-larson >/dev/null || exit 1