Tiny: fix header/stride mismatch and harden refill paths

- Root cause: header-based class indexing (HEADER_CLASSIDX=1) wrote a 1-byte
  header during allocation, but linear carve/refill and initial slab capacity
  still used bare class block sizes. This mismatch could overrun slab usable
  space and corrupt freelists, causing reproducible SEGV at ~100k iters.

Changes
- Superslab: compute capacity with effective stride (block_size + header for
  classes 0..6; class7 remains headerless) in superslab_init_slab(). Add a
  debug-only bound check in superslab_alloc_from_slab() to fail fast if carve
  would exceed usable bytes.
- Refill (non-P0 and P0): use header-aware stride for all linear carving and
  TLS window bump operations. Ensure alignment/validation in tiny_refill_opt.h
  also uses stride, not raw class size.
- Drain: keep existing defense-in-depth for remote sentinel and sanitize nodes
  before splicing into freelist (already present).

Notes
- This unifies the memory layout across alloc/linear-carve/refill with a single
  stride definition and keeps class7 (1024B) headerless as designed.
- Debug builds add fail-fast checks; release builds remain lean.

Next
- Re-run Tiny benches (256/1024B) in debug to confirm stability, then in
  release. If any remaining crash persists, bisect with HAKMEM_TINY_P0_BATCH_REFILL=0
  to isolate P0 batch carve, and continue reducing branch-miss as planned.

dev_pool_tls.sh

@@ -0,0 +1,95 @@
+#!/usr/bin/env bash
+# dev_pool_tls.sh - Pool TLS Phase 1.5a 開発サイクル統合スクリプト
+#
+# Build → Verify → Quick Test の一連の流れを自動化
+
+set -euo pipefail
+
+ACTION="${1:-test}"
+TARGET="${2:-bench_mid_large_mt_hakmem}"
+
+case "$ACTION" in
+    build)
+        echo "🔨 Building Pool TLS Phase 1.5a..."
+        ./build_pool_tls.sh "$TARGET"
+        ;;
+
+    verify)
+        echo "🔍 Verifying build..."
+        ./verify_build.sh "$TARGET"
+        ;;
+
+    test)
+        echo "========================================="
+        echo " 🚀 Pool TLS Phase 1.5a Dev Cycle"
+        echo "========================================="
+        echo ""
+
+        # 1. Build
+        echo "📦 Step 1/3: Building..."
+        ./build_pool_tls.sh "$TARGET" >/dev/null 2>&1
+        echo "✓ Build complete"
+
+        # 2. Verify
+        echo "🔍 Step 2/3: Verifying..."
+        if ./verify_build.sh "$TARGET" >/dev/null 2>&1; then
+            echo "✓ Build verification passed"
+        else
+            echo "❌ Build verification FAILED"
+            exit 1
+        fi
+
+        # 3. Quick smoke test
+        echo "🧪 Step 3/3: Quick smoke test..."
+        RESULT=$(timeout 10 ./"$TARGET" 1 100 256 42 2>&1 | grep "Throughput" || echo "FAILED")
+
+        if [[ "$RESULT" == *"FAILED"* ]]; then
+            echo "❌ Smoke test FAILED"
+            exit 1
+        fi
+
+        OPS=$(echo "$RESULT" | awk '{print $3}')
+        echo "✓ Smoke test passed: $OPS ops/s"
+
+        echo ""
+        echo "========================================="
+        echo " ✅ All checks passed!"
+        echo "========================================="
+        echo ""
+        echo "💡 Next steps:"
+        echo "  # Full benchmark"
+        echo "  ./run_pool_bench.sh"
+        echo ""
+        echo "  # Debug if needed"
+        echo "  ./build_debug.sh $TARGET gdb"
+        echo "  gdb ./$TARGET"
+        ;;
+
+    bench)
+        echo "📊 Running full benchmark..."
+        ./run_pool_bench.sh
+        ;;
+
+    clean)
+        echo "🧹 Cleaning build artifacts..."
+        make clean >/dev/null 2>&1 || true
+        echo "✓ Clean complete"
+        ;;
+
+    *)
+        echo "Usage: $0 {build|verify|test|bench|clean} [target]"
+        echo ""
+        echo "Actions:"
+        echo "  build   - Build Pool TLS Phase 1.5a"
+        echo "  verify  - Verify build integrity"
+        echo "  test    - Build + Verify + Quick smoke test (default)"
+        echo "  bench   - Run full benchmark vs System malloc"
+        echo "  clean   - Clean build artifacts"
+        echo ""
+        echo "Examples:"
+        echo "  $0 test                              # Quick dev cycle"
+        echo "  $0 bench                             # Full benchmark"
+        echo "  $0 build larson_hakmem               # Build Larson test"
+        exit 1
+        ;;
+esac