diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md
index a432786f..2b597a03 100644
--- a/CURRENT_TASK.md
+++ b/CURRENT_TASK.md
@@ -224,12 +224,49 @@ Phase 6-10 で達成した累積改善:
 
 **Next**: Phase 12 Strategic Pause の次の gap 仮説へ進む
 
-### Next: Phase 14（Pointer Chase Reduction / Tiny tcache）
+### Phase 14 v1: Pointer Chase Reduction (tcache-style) — NEUTRAL (+0.20%) ⚠️ RESEARCH BOX
 
-**狙い**: system malloc の tcache に寄せて、Tiny frontend の “配列/FIFO/indirection” コストを減らす。
+**Date**: 2025-12-15
+**Verdict**: **NEUTRAL (+0.20%)** — Frozen as research box (default OFF, manual opt-in)
 
-- 設計: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md`
-- 指示: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md`
+**Target**: Reduce pointer-chase overhead with intrusive LIFO tcache layer (inspired by glibc tcache)
+
+**Strategy (v1)**:
+- Add intrusive LIFO tcache layer (L1) before existing array-based UnifiedCache
+- TLS per-class bins (head pointer + count)
+- Intrusive next pointers stored in blocks (via tiny_next_store/load SSOT)
+- Cap: 64 blocks per class (default, configurable)
+- ENV: `HAKMEM_TINY_TCACHE=0/1` (default: 0, OFF)
+
+**Results (Mixed 10-run)**:
+| Case | TCACHE | Mean (ops/s) | Median (ops/s) | Delta |
+|------|--------|--------------|----------------|-------|
+| A (baseline) | 0 | 51,083,379 | 50,955,866 | — |
+| B (optimized) | 1 | 51,186,838 | 51,255,986 | **+0.20%** (mean) / **+0.59%** (median) |
+
+**Key Findings**:
+1. **Mean delta: +0.20%** (below +1.0% GO threshold → NEUTRAL)
+2. **Median delta: +0.59%** (slightly better stability, but still NEUTRAL)
+3. **Expected ROI (+15-25%) not achieved** on Mixed workload
+4. ⚠️ **v1 の統合点が “free 側中心” で、alloc ホットパス（`tiny_hot_alloc_fast()`）が tcache を消費しない**
+   - 現状: `unified_cache_push()` は tcache に入るが、alloc 側は FIFO（`g_unified_cache[].slots`）のみ → tcache が実質 sink になりやすい
+   - v1 の A/B は ROI を過小評価する可能性が高い（Phase 14 v2 で通電確認が必要）
+
+**Possible Reasons for Lower ROI**:
+- **Workload mismatch**: Mixed (16–1024B) spans C0-C7, but tcache benefits may be concentrated in hot classes (C2/C3)
+- **Existing cache efficiency**: UnifiedCache array access may already be well-cached in L1/L2
+- **Cap too small**: Default cap=64 may cause frequent overflow to array cache
+- **Intrusive next overhead**: Writing/reading next pointers may offset pointer-chase reduction
+
+**Action**:
+- ✅ Freeze Phase 14 v1 as research box (default OFF)
+- ENV: `HAKMEM_TINY_TCACHE=0/1` (default: 0), `HAKMEM_TINY_TCACHE_CAP=64`
+- 📋 Results: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_AB_TEST_RESULTS.md`
+- 📋 Design: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md`
+- 📋 Instructions: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md`
+- 📋 Next (Phase 14 v2): `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md`（alloc/pop 統合）
+
+**Future Work**: Consider per-class cap tuning or alternative pointer-chase reduction strategies
 
 ## 更新メモ（2025-12-14 Phase 5 E5-3 Analysis - Strategic Pivot）
 
diff --git a/Makefile b/Makefile
index ad914f5b..0408602a 100644
--- a/Makefile
+++ b/Makefile
@@ -218,12 +218,12 @@ LDFLAGS += $(EXTRA_LDFLAGS)
 
 # Targets
 TARGET = test_hakmem
-OBJS_BASE = hakmem.o hakmem_config.o hakmem_tiny_config.o hakmem_ucb1.o hakmem_bigcache.o hakmem_pool.o hakmem_l25_pool.o hakmem_site_rules.o hakmem_tiny.o core/box/ss_allocation_box.o superslab_stats.o superslab_cache.o superslab_ace.o superslab_slab.o superslab_backend.o core/superslab_head_stub.o hakmem_smallmid.o tiny_sticky.o tiny_remote.o tiny_publish.o tiny_debug_ring.o hakmem_tiny_magazine.o hakmem_tiny_stats.o hakmem_tiny_sfc.o hakmem_tiny_query.o hakmem_tiny_rss.o hakmem_tiny_registry.o hakmem_tiny_remote_target.o hakmem_tiny_bg_spill.o tiny_adaptive_sizing.o hakmem_super_registry.o hakmem_shared_pool.o hakmem_shared_pool_acquire.o hakmem_shared_pool_release.o hakmem_elo.o hakmem_batch.o hakmem_p2.o hakmem_sizeclass_dist.o hakmem_evo.o hakmem_debug.o hakmem_sys.o hakmem_whale.o hakmem_policy.o hakmem_ace.o hakmem_ace_stats.o hakmem_prof.o hakmem_learner.o hakmem_size_hist.o hakmem_learn_log.o hakmem_syscall.o hakmem_ace_metrics.o hakmem_ace_ucb1.o hakmem_ace_controller.o tiny_fastcache.o core/box/superslab_expansion_box.o core/box/integrity_box.o core/box/free_publish_box.o core/box/mailbox_box.o core/box/front_gate_box.o core/box/front_gate_classifier.o core/box/capacity_box.o core/box/carve_push_box.o core/box/prewarm_box.o core/box/ss_hot_prewarm_box.o core/box/front_metrics_box.o core/box/bench_fast_box.o core/box/ss_addr_map_box.o core/box/ss_pt_impl.o core/box/slab_recycling_box.o core/box/pagefault_telemetry_box.o core/box/tiny_sizeclass_hist_box.o core/box/tiny_env_box.o core/box/tiny_route_box.o core/box/free_front_v3_env_box.o core/box/free_path_stats_box.o core/box/free_dispatch_stats_box.o core/box/free_cold_shape_env_box.o core/box/free_cold_shape_stats_box.o core/box/alloc_gate_stats_box.o core/box/tiny_c6_ultra_free_box.o core/box/tiny_c5_ultra_free_box.o core/box/tiny_c4_ultra_free_box.o core/box/tiny_ultra_tls_box.o core/box/tiny_page_box.o core/box/tiny_class_policy_box.o core/box/tiny_class_stats_box.o core/box/tiny_policy_learner_box.o core/box/ss_budget_box.o core/box/tiny_mem_stats_box.o core/box/c7_meta_used_counter_box.o core/box/tiny_static_route_box.o core/box/tiny_metadata_cache_hot_box.o core/box/wrapper_env_box.o core/box/free_wrapper_env_snapshot_box.o core/box/malloc_wrapper_env_snapshot_box.o core/box/madvise_guard_box.o core/box/libm_reloc_guard_box.o core/box/ptr_trace_box.o core/box/link_missing_stubs.o core/box/super_reg_box.o core/box/shared_pool_box.o core/box/remote_side_box.o core/box/hakmem_env_snapshot_box.o core/box/tiny_c7_preserve_header_env_box.o core/page_arena.o core/front/tiny_unified_cache.o core/tiny_alloc_fast_push.o core/tiny_c7_ultra_segment.o core/tiny_c7_ultra.o core/link_stubs.o core/tiny_failfast.o core/tiny_destructors.o core/smallobject_hotbox_v3.o core/smallobject_hotbox_v4.o core/smallobject_hotbox_v5.o core/smallsegment_v5.o core/smallobject_cold_iface_v5.o core/smallsegment_v6.o core/smallobject_cold_iface_v6.o core/smallobject_core_v6.o core/region_id_v6.o core/smallsegment_v7.o core/smallobject_cold_iface_v7.o core/mid_hotbox_v3.o core/smallobject_policy_v7.o core/smallobject_segment_mid_v3.o core/smallobject_cold_iface_mid_v3.o core/smallobject_stats_mid_v3.o core/smallobject_learner_v2.o core/smallobject_mid_v35.o
+OBJS_BASE = hakmem.o hakmem_config.o hakmem_tiny_config.o hakmem_ucb1.o hakmem_bigcache.o hakmem_pool.o hakmem_l25_pool.o hakmem_site_rules.o hakmem_tiny.o core/box/ss_allocation_box.o superslab_stats.o superslab_cache.o superslab_ace.o superslab_slab.o superslab_backend.o core/superslab_head_stub.o hakmem_smallmid.o tiny_sticky.o tiny_remote.o tiny_publish.o tiny_debug_ring.o hakmem_tiny_magazine.o hakmem_tiny_stats.o hakmem_tiny_sfc.o hakmem_tiny_query.o hakmem_tiny_rss.o hakmem_tiny_registry.o hakmem_tiny_remote_target.o hakmem_tiny_bg_spill.o tiny_adaptive_sizing.o hakmem_super_registry.o hakmem_shared_pool.o hakmem_shared_pool_acquire.o hakmem_shared_pool_release.o hakmem_elo.o hakmem_batch.o hakmem_p2.o hakmem_sizeclass_dist.o hakmem_evo.o hakmem_debug.o hakmem_sys.o hakmem_whale.o hakmem_policy.o hakmem_ace.o hakmem_ace_stats.o hakmem_prof.o hakmem_learner.o hakmem_size_hist.o hakmem_learn_log.o hakmem_syscall.o hakmem_ace_metrics.o hakmem_ace_ucb1.o hakmem_ace_controller.o tiny_fastcache.o core/box/superslab_expansion_box.o core/box/integrity_box.o core/box/free_publish_box.o core/box/mailbox_box.o core/box/front_gate_box.o core/box/front_gate_classifier.o core/box/capacity_box.o core/box/carve_push_box.o core/box/prewarm_box.o core/box/ss_hot_prewarm_box.o core/box/front_metrics_box.o core/box/bench_fast_box.o core/box/ss_addr_map_box.o core/box/ss_pt_impl.o core/box/slab_recycling_box.o core/box/pagefault_telemetry_box.o core/box/tiny_sizeclass_hist_box.o core/box/tiny_env_box.o core/box/tiny_route_box.o core/box/free_front_v3_env_box.o core/box/free_path_stats_box.o core/box/free_dispatch_stats_box.o core/box/free_cold_shape_env_box.o core/box/free_cold_shape_stats_box.o core/box/alloc_gate_stats_box.o core/box/tiny_c6_ultra_free_box.o core/box/tiny_c5_ultra_free_box.o core/box/tiny_c4_ultra_free_box.o core/box/tiny_ultra_tls_box.o core/box/tiny_page_box.o core/box/tiny_class_policy_box.o core/box/tiny_class_stats_box.o core/box/tiny_policy_learner_box.o core/box/ss_budget_box.o core/box/tiny_mem_stats_box.o core/box/c7_meta_used_counter_box.o core/box/tiny_static_route_box.o core/box/tiny_metadata_cache_hot_box.o core/box/wrapper_env_box.o core/box/free_wrapper_env_snapshot_box.o core/box/malloc_wrapper_env_snapshot_box.o core/box/madvise_guard_box.o core/box/libm_reloc_guard_box.o core/box/ptr_trace_box.o core/box/link_missing_stubs.o core/box/super_reg_box.o core/box/shared_pool_box.o core/box/remote_side_box.o core/box/hakmem_env_snapshot_box.o core/box/tiny_c7_preserve_header_env_box.o core/box/tiny_tcache_env_box.o core/page_arena.o core/front/tiny_unified_cache.o core/tiny_alloc_fast_push.o core/tiny_c7_ultra_segment.o core/tiny_c7_ultra.o core/link_stubs.o core/tiny_failfast.o core/tiny_destructors.o core/smallobject_hotbox_v3.o core/smallobject_hotbox_v4.o core/smallobject_hotbox_v5.o core/smallsegment_v5.o core/smallobject_cold_iface_v5.o core/smallsegment_v6.o core/smallobject_cold_iface_v6.o core/smallobject_core_v6.o core/region_id_v6.o core/smallsegment_v7.o core/smallobject_cold_iface_v7.o core/mid_hotbox_v3.o core/smallobject_policy_v7.o core/smallobject_segment_mid_v3.o core/smallobject_cold_iface_mid_v3.o core/smallobject_stats_mid_v3.o core/smallobject_learner_v2.o core/smallobject_mid_v35.o
 OBJS = $(OBJS_BASE)
 
 # Shared library
 SHARED_LIB = libhakmem.so
-SHARED_OBJS = hakmem_shared.o hakmem_config_shared.o hakmem_tiny_config_shared.o hakmem_ucb1_shared.o hakmem_bigcache_shared.o hakmem_pool_shared.o hakmem_l25_pool_shared.o hakmem_site_rules_shared.o hakmem_tiny_shared.o core/box/ss_allocation_box_shared.o superslab_stats_shared.o superslab_cache_shared.o superslab_ace_shared.o superslab_slab_shared.o superslab_backend_shared.o core/superslab_head_stub_shared.o hakmem_smallmid_shared.o core/box/superslab_expansion_box_shared.o core/box/integrity_box_shared.o core/box/mailbox_box_shared.o core/box/front_gate_box_shared.o core/box/front_gate_classifier_shared.o core/box/free_publish_box_shared.o core/box/capacity_box_shared.o core/box/carve_push_box_shared.o core/box/prewarm_box_shared.o core/box/ss_hot_prewarm_box_shared.o core/box/front_metrics_box_shared.o core/box/bench_fast_box_shared.o core/box/ss_addr_map_box_shared.o core/box/ss_pt_impl_shared.o core/box/slab_recycling_box_shared.o core/box/pagefault_telemetry_box_shared.o core/box/tiny_sizeclass_hist_box_shared.o core/box/tiny_env_box_shared.o core/box/tiny_route_box_shared.o core/box/free_front_v3_env_box_shared.o core/box/free_path_stats_box_shared.o core/box/free_dispatch_stats_box_shared.o core/box/alloc_gate_stats_box_shared.o core/box/tiny_page_box_shared.o core/box/tiny_class_policy_box_shared.o core/box/tiny_class_stats_box_shared.o core/box/tiny_policy_learner_box_shared.o core/box/ss_budget_box_shared.o core/box/tiny_mem_stats_box_shared.o core/box/wrapper_env_box_shared.o core/box/free_wrapper_env_snapshot_box_shared.o core/box/malloc_wrapper_env_snapshot_box_shared.o core/box/madvise_guard_box_shared.o core/box/libm_reloc_guard_box_shared.o core/box/hakmem_env_snapshot_box_shared.o core/box/tiny_c7_preserve_header_env_box_shared.o core/page_arena_shared.o core/front/tiny_unified_cache_shared.o core/tiny_alloc_fast_push_shared.o core/tiny_c7_ultra_segment_shared.o core/tiny_c7_ultra_shared.o core/link_stubs_shared.o core/tiny_failfast_shared.o tiny_sticky_shared.o tiny_remote_shared.o tiny_publish_shared.o tiny_debug_ring_shared.o hakmem_tiny_magazine_shared.o hakmem_tiny_stats_shared.o hakmem_tiny_sfc_shared.o hakmem_tiny_query_shared.o hakmem_tiny_rss_shared.o hakmem_tiny_registry_shared.o hakmem_tiny_remote_target_shared.o hakmem_tiny_bg_spill_shared.o tiny_adaptive_sizing_shared.o hakmem_super_registry_shared.o hakmem_shared_pool_shared.o hakmem_shared_pool_acquire_shared.o hakmem_shared_pool_release_shared.o hakmem_elo_shared.o hakmem_batch_shared.o hakmem_p2_shared.o hakmem_sizeclass_dist_shared.o hakmem_evo_shared.o hakmem_debug_shared.o hakmem_sys_shared.o hakmem_whale_shared.o hakmem_policy_shared.o hakmem_ace_shared.o hakmem_ace_stats_shared.o hakmem_ace_controller_shared.o hakmem_ace_metrics_shared.o hakmem_ace_ucb1_shared.o hakmem_prof_shared.o hakmem_learner_shared.o hakmem_size_hist_shared.o hakmem_learn_log_shared.o hakmem_syscall_shared.o tiny_fastcache_shared.o core/box/super_reg_box_shared.o core/box/shared_pool_box_shared.o core/box/remote_side_box_shared.o core/tiny_destructors_shared.o
+SHARED_OBJS = hakmem_shared.o hakmem_config_shared.o hakmem_tiny_config_shared.o hakmem_ucb1_shared.o hakmem_bigcache_shared.o hakmem_pool_shared.o hakmem_l25_pool_shared.o hakmem_site_rules_shared.o hakmem_tiny_shared.o core/box/ss_allocation_box_shared.o superslab_stats_shared.o superslab_cache_shared.o superslab_ace_shared.o superslab_slab_shared.o superslab_backend_shared.o core/superslab_head_stub_shared.o hakmem_smallmid_shared.o core/box/superslab_expansion_box_shared.o core/box/integrity_box_shared.o core/box/mailbox_box_shared.o core/box/front_gate_box_shared.o core/box/front_gate_classifier_shared.o core/box/free_publish_box_shared.o core/box/capacity_box_shared.o core/box/carve_push_box_shared.o core/box/prewarm_box_shared.o core/box/ss_hot_prewarm_box_shared.o core/box/front_metrics_box_shared.o core/box/bench_fast_box_shared.o core/box/ss_addr_map_box_shared.o core/box/ss_pt_impl_shared.o core/box/slab_recycling_box_shared.o core/box/pagefault_telemetry_box_shared.o core/box/tiny_sizeclass_hist_box_shared.o core/box/tiny_env_box_shared.o core/box/tiny_route_box_shared.o core/box/free_front_v3_env_box_shared.o core/box/free_path_stats_box_shared.o core/box/free_dispatch_stats_box_shared.o core/box/alloc_gate_stats_box_shared.o core/box/tiny_page_box_shared.o core/box/tiny_class_policy_box_shared.o core/box/tiny_class_stats_box_shared.o core/box/tiny_policy_learner_box_shared.o core/box/ss_budget_box_shared.o core/box/tiny_mem_stats_box_shared.o core/box/wrapper_env_box_shared.o core/box/free_wrapper_env_snapshot_box_shared.o core/box/malloc_wrapper_env_snapshot_box_shared.o core/box/madvise_guard_box_shared.o core/box/libm_reloc_guard_box_shared.o core/box/hakmem_env_snapshot_box_shared.o core/box/tiny_c7_preserve_header_env_box_shared.o core/box/tiny_tcache_env_box_shared.o core/page_arena_shared.o core/front/tiny_unified_cache_shared.o core/tiny_alloc_fast_push_shared.o core/tiny_c7_ultra_segment_shared.o core/tiny_c7_ultra_shared.o core/link_stubs_shared.o core/tiny_failfast_shared.o tiny_sticky_shared.o tiny_remote_shared.o tiny_publish_shared.o tiny_debug_ring_shared.o hakmem_tiny_magazine_shared.o hakmem_tiny_stats_shared.o hakmem_tiny_sfc_shared.o hakmem_tiny_query_shared.o hakmem_tiny_rss_shared.o hakmem_tiny_registry_shared.o hakmem_tiny_remote_target_shared.o hakmem_tiny_bg_spill_shared.o tiny_adaptive_sizing_shared.o hakmem_super_registry_shared.o hakmem_shared_pool_shared.o hakmem_shared_pool_acquire_shared.o hakmem_shared_pool_release_shared.o hakmem_elo_shared.o hakmem_batch_shared.o hakmem_p2_shared.o hakmem_sizeclass_dist_shared.o hakmem_evo_shared.o hakmem_debug_shared.o hakmem_sys_shared.o hakmem_whale_shared.o hakmem_policy_shared.o hakmem_ace_shared.o hakmem_ace_stats_shared.o hakmem_ace_controller_shared.o hakmem_ace_metrics_shared.o hakmem_ace_ucb1_shared.o hakmem_prof_shared.o hakmem_learner_shared.o hakmem_size_hist_shared.o hakmem_learn_log_shared.o hakmem_syscall_shared.o tiny_fastcache_shared.o core/box/super_reg_box_shared.o core/box/shared_pool_box_shared.o core/box/remote_side_box_shared.o core/tiny_destructors_shared.o
 
 # Pool TLS Phase 1 (enable with POOL_TLS_PHASE1=1)
 ifeq ($(POOL_TLS_PHASE1),1)
@@ -427,7 +427,7 @@ test-box-refactor: box-refactor
 	./larson_hakmem 10 8 128 1024 1 12345 4
 
 # Phase 4: Tiny Pool benchmarks (properly linked with hakmem)
-TINY_BENCH_OBJS_BASE = hakmem.o hakmem_config.o hakmem_tiny_config.o hakmem_ucb1.o hakmem_bigcache.o hakmem_pool.o hakmem_l25_pool.o hakmem_site_rules.o hakmem_tiny.o core/box/ss_allocation_box.o superslab_stats.o superslab_cache.o superslab_ace.o superslab_slab.o superslab_backend.o core/superslab_head_stub.o hakmem_smallmid.o core/box/superslab_expansion_box.o core/box/integrity_box.o core/box/mailbox_box.o core/box/front_gate_box.o core/box/front_gate_classifier.o core/box/free_publish_box.o core/box/capacity_box.o core/box/carve_push_box.o core/box/prewarm_box.o core/box/ss_hot_prewarm_box.o core/box/front_metrics_box.o core/box/bench_fast_box.o core/box/ss_addr_map_box.o core/box/ss_pt_impl.o core/box/slab_recycling_box.o core/box/pagefault_telemetry_box.o core/box/tiny_sizeclass_hist_box.o core/box/tiny_env_box.o core/box/tiny_route_box.o core/box/free_front_v3_env_box.o core/box/free_path_stats_box.o core/box/free_dispatch_stats_box.o core/box/free_cold_shape_env_box.o core/box/free_cold_shape_stats_box.o core/box/alloc_gate_stats_box.o core/box/tiny_c6_ultra_free_box.o core/box/tiny_c5_ultra_free_box.o core/box/tiny_c4_ultra_free_box.o core/box/tiny_ultra_tls_box.o core/box/tiny_page_box.o core/box/tiny_class_policy_box.o core/box/tiny_class_stats_box.o core/box/tiny_policy_learner_box.o core/box/ss_budget_box.o core/box/tiny_mem_stats_box.o core/box/c7_meta_used_counter_box.o core/box/tiny_static_route_box.o core/box/tiny_metadata_cache_hot_box.o core/box/wrapper_env_box.o core/box/free_wrapper_env_snapshot_box.o core/box/malloc_wrapper_env_snapshot_box.o core/box/madvise_guard_box.o core/box/libm_reloc_guard_box.o core/box/ptr_trace_box.o core/box/link_missing_stubs.o core/box/super_reg_box.o core/box/shared_pool_box.o core/box/remote_side_box.o core/box/tiny_free_route_cache_env_box.o core/box/hakmem_env_snapshot_box.o core/box/tiny_c7_preserve_header_env_box.o core/page_arena.o core/front/tiny_unified_cache.o tiny_sticky.o tiny_remote.o tiny_publish.o tiny_debug_ring.o hakmem_tiny_magazine.o hakmem_tiny_stats.o hakmem_tiny_sfc.o hakmem_tiny_query.o hakmem_tiny_rss.o hakmem_tiny_registry.o hakmem_tiny_remote_target.o hakmem_tiny_bg_spill.o tiny_adaptive_sizing.o hakmem_super_registry.o hakmem_shared_pool.o hakmem_shared_pool_acquire.o hakmem_shared_pool_release.o hakmem_elo.o hakmem_batch.o hakmem_p2.o hakmem_sizeclass_dist.o hakmem_evo.o hakmem_debug.o hakmem_sys.o hakmem_whale.o hakmem_policy.o hakmem_ace.o hakmem_ace_stats.o hakmem_prof.o hakmem_learner.o hakmem_size_hist.o hakmem_learn_log.o hakmem_syscall.o hakmem_ace_metrics.o hakmem_ace_ucb1.o hakmem_ace_controller.o tiny_fastcache.o core/tiny_alloc_fast_push.o core/tiny_c7_ultra_segment.o core/tiny_c7_ultra.o core/link_stubs.o core/tiny_failfast.o core/tiny_destructors.o core/smallobject_hotbox_v3.o core/smallobject_hotbox_v4.o core/smallobject_hotbox_v5.o core/smallsegment_v5.o core/smallobject_cold_iface_v5.o core/smallsegment_v6.o core/smallobject_cold_iface_v6.o core/smallobject_core_v6.o core/region_id_v6.o core/smallsegment_v7.o core/smallobject_cold_iface_v7.o core/mid_hotbox_v3.o core/smallobject_policy_v7.o core/smallobject_segment_mid_v3.o core/smallobject_cold_iface_mid_v3.o core/smallobject_stats_mid_v3.o core/smallobject_learner_v2.o core/smallobject_mid_v35.o
+TINY_BENCH_OBJS_BASE = hakmem.o hakmem_config.o hakmem_tiny_config.o hakmem_ucb1.o hakmem_bigcache.o hakmem_pool.o hakmem_l25_pool.o hakmem_site_rules.o hakmem_tiny.o core/box/ss_allocation_box.o superslab_stats.o superslab_cache.o superslab_ace.o superslab_slab.o superslab_backend.o core/superslab_head_stub.o hakmem_smallmid.o core/box/superslab_expansion_box.o core/box/integrity_box.o core/box/mailbox_box.o core/box/front_gate_box.o core/box/front_gate_classifier.o core/box/free_publish_box.o core/box/capacity_box.o core/box/carve_push_box.o core/box/prewarm_box.o core/box/ss_hot_prewarm_box.o core/box/front_metrics_box.o core/box/bench_fast_box.o core/box/ss_addr_map_box.o core/box/ss_pt_impl.o core/box/slab_recycling_box.o core/box/pagefault_telemetry_box.o core/box/tiny_sizeclass_hist_box.o core/box/tiny_env_box.o core/box/tiny_route_box.o core/box/free_front_v3_env_box.o core/box/free_path_stats_box.o core/box/free_dispatch_stats_box.o core/box/free_cold_shape_env_box.o core/box/free_cold_shape_stats_box.o core/box/alloc_gate_stats_box.o core/box/tiny_c6_ultra_free_box.o core/box/tiny_c5_ultra_free_box.o core/box/tiny_c4_ultra_free_box.o core/box/tiny_ultra_tls_box.o core/box/tiny_page_box.o core/box/tiny_class_policy_box.o core/box/tiny_class_stats_box.o core/box/tiny_policy_learner_box.o core/box/ss_budget_box.o core/box/tiny_mem_stats_box.o core/box/c7_meta_used_counter_box.o core/box/tiny_static_route_box.o core/box/tiny_metadata_cache_hot_box.o core/box/wrapper_env_box.o core/box/free_wrapper_env_snapshot_box.o core/box/malloc_wrapper_env_snapshot_box.o core/box/madvise_guard_box.o core/box/libm_reloc_guard_box.o core/box/ptr_trace_box.o core/box/link_missing_stubs.o core/box/super_reg_box.o core/box/shared_pool_box.o core/box/remote_side_box.o core/box/tiny_free_route_cache_env_box.o core/box/hakmem_env_snapshot_box.o core/box/tiny_c7_preserve_header_env_box.o core/box/tiny_tcache_env_box.o core/page_arena.o core/front/tiny_unified_cache.o tiny_sticky.o tiny_remote.o tiny_publish.o tiny_debug_ring.o hakmem_tiny_magazine.o hakmem_tiny_stats.o hakmem_tiny_sfc.o hakmem_tiny_query.o hakmem_tiny_rss.o hakmem_tiny_registry.o hakmem_tiny_remote_target.o hakmem_tiny_bg_spill.o tiny_adaptive_sizing.o hakmem_super_registry.o hakmem_shared_pool.o hakmem_shared_pool_acquire.o hakmem_shared_pool_release.o hakmem_elo.o hakmem_batch.o hakmem_p2.o hakmem_sizeclass_dist.o hakmem_evo.o hakmem_debug.o hakmem_sys.o hakmem_whale.o hakmem_policy.o hakmem_ace.o hakmem_ace_stats.o hakmem_prof.o hakmem_learner.o hakmem_size_hist.o hakmem_learn_log.o hakmem_syscall.o hakmem_ace_metrics.o hakmem_ace_ucb1.o hakmem_ace_controller.o tiny_fastcache.o core/tiny_alloc_fast_push.o core/tiny_c7_ultra_segment.o core/tiny_c7_ultra.o core/link_stubs.o core/tiny_failfast.o core/tiny_destructors.o core/smallobject_hotbox_v3.o core/smallobject_hotbox_v4.o core/smallobject_hotbox_v5.o core/smallsegment_v5.o core/smallobject_cold_iface_v5.o core/smallsegment_v6.o core/smallobject_cold_iface_v6.o core/smallobject_core_v6.o core/region_id_v6.o core/smallsegment_v7.o core/smallobject_cold_iface_v7.o core/mid_hotbox_v3.o core/smallobject_policy_v7.o core/smallobject_segment_mid_v3.o core/smallobject_cold_iface_mid_v3.o core/smallobject_stats_mid_v3.o core/smallobject_learner_v2.o core/smallobject_mid_v35.o
 TINY_BENCH_OBJS = $(TINY_BENCH_OBJS_BASE)
 ifeq ($(POOL_TLS_PHASE1),1)
 TINY_BENCH_OBJS += pool_tls.o pool_refill.o core/pool_tls_arena.o pool_tls_registry.o pool_tls_remote.o
diff --git a/core/bench_profile.h b/core/bench_profile.h
index a187f8d9..5aa3eded 100644
--- a/core/bench_profile.h
+++ b/core/bench_profile.h
@@ -11,6 +11,7 @@
 #include "box/hakmem_env_snapshot_box.h"  // hakmem_env_snapshot_refresh_from_env (Phase 4 E1)
 #include "box/tiny_free_route_cache_env_box.h"  // tiny_free_static_route_refresh_from_env (Phase 8)
 #include "box/tiny_c7_preserve_header_env_box.h"  // tiny_c7_preserve_header_env_refresh_from_env (Phase 13 v1)
+#include "box/tiny_tcache_env_box.h"  // tiny_tcache_env_refresh_from_env (Phase 14 v1)
 #endif
 
 // env が未設定のときだけ既定値を入れる
@@ -187,5 +188,7 @@ static inline void bench_apply_profile(void) {
 	  tiny_free_static_route_refresh_from_env();
 	  // Phase 13 v1: Sync C7 preserve header ENV cache after bench_profile putenv defaults.
 	  tiny_c7_preserve_header_env_refresh_from_env();
+	  // Phase 14 v1: Sync tcache ENV cache after bench_profile putenv defaults.
+	  tiny_tcache_env_refresh_from_env();
 #endif
 	}
diff --git a/core/box/tiny_tcache_box.h b/core/box/tiny_tcache_box.h
new file mode 100644
index 00000000..7e6b1f12
--- /dev/null
+++ b/core/box/tiny_tcache_box.h
@@ -0,0 +1,162 @@
+// ============================================================================
+// Phase 14 v1: Tiny tcache Box (L1) - Intrusive LIFO Cache
+// ============================================================================
+//
+// Purpose: Per-class intrusive LIFO cache (tcache-style)
+//
+// Design: docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
+//
+// Strategy:
+//   - Thread-local head pointers + count per class
+//   - Intrusive next pointers stored in blocks (via tiny_next_store/load)
+//   - Cap-limited LIFO (no overflow, delegate to UnifiedCache)
+//   - Hit path: O(1) pointer operations only (no array access)
+//
+// Invariants:
+//   - Only BASE pointers stored (never USER pointers)
+//   - count <= cap always
+//   - One block in tcache OR unified_cache, never both
+//   - Next pointer via tiny_next_store/load SSOT only
+//
+// API:
+//   tiny_tcache_try_push(class_idx, base) -> bool (handled?)
+//   tiny_tcache_try_pop(class_idx) -> void* (BASE or NULL)
+//
+// Safety:
+//   - Debug: assert count <= cap
+//   - Debug: assert base != NULL and reasonable range
+//   - Release: fast path, no checks
+//
+// ============================================================================
+
+#ifndef TINY_TCACHE_BOX_H
+#define TINY_TCACHE_BOX_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <assert.h>
+#include "../hakmem_build_flags.h"
+#include "../hakmem_tiny_config.h"  // TINY_NUM_CLASSES
+#include "../tiny_nextptr.h"        // tiny_next_store/load SSOT
+#include "tiny_tcache_env_box.h"    // tiny_tcache_enabled/cap
+
+// ============================================================================
+// TLS State (per-thread, per-class)
+// ============================================================================
+
+typedef struct {
+    void* head;       // BASE pointer to first block (or NULL)
+    uint16_t count;   // Number of blocks in this tcache
+} TinyTcacheBin;
+
+// Thread-local storage: 8 classes (C0-C7)
+static __thread TinyTcacheBin g_tiny_tcache_bins[TINY_NUM_CLASSES];
+
+// ============================================================================
+// Push (try to add block to tcache)
+// ============================================================================
+//
+// Arguments:
+//   class_idx - Tiny class index (0-7)
+//   base      - BASE pointer to freed block
+//
+// Returns:
+//   true  - Block accepted into tcache
+//   false - Tcache full (overflow), caller should use unified_cache
+//
+// Side effects:
+//   - Writes intrusive next pointer into block (via tiny_next_store)
+//   - Updates head and count
+//
+
+static inline bool tiny_tcache_try_push(int class_idx, void* base) {
+    // ENV gate check (cached, should be fast)
+    if (!tiny_tcache_enabled()) {
+        return false;  // Tcache disabled, fall through to unified_cache
+    }
+
+    TinyTcacheBin* bin = &g_tiny_tcache_bins[class_idx];
+    uint16_t cap = tiny_tcache_cap();
+
+    // Check capacity
+    if (bin->count >= cap) {
+        return false;  // Overflow, delegate to unified_cache
+    }
+
+    // Debug: validate base pointer
+#if !HAKMEM_BUILD_RELEASE
+    if (base == NULL || (uintptr_t)base < 4096) {
+        fprintf(stderr, "[TINY_TCACHE] BUG: invalid base=%p in try_push (class=%d)\n", base, class_idx);
+        abort();
+    }
+#endif
+
+    // LIFO push: link block to current head
+    tiny_next_store(base, class_idx, bin->head);
+    bin->head = base;
+    bin->count++;
+
+    // Debug: check invariant
+#if !HAKMEM_BUILD_RELEASE
+    assert(bin->count <= cap);
+#endif
+
+    return true;  // Block accepted
+}
+
+// ============================================================================
+// Pop (try to get block from tcache)
+// ============================================================================
+//
+// Arguments:
+//   class_idx - Tiny class index (0-7)
+//
+// Returns:
+//   BASE pointer - Block from tcache (LIFO order)
+//   NULL         - Tcache empty, caller should use unified_cache
+//
+// Side effects:
+//   - Reads intrusive next pointer from block (via tiny_next_load)
+//   - Updates head and count
+//
+
+static inline void* tiny_tcache_try_pop(int class_idx) {
+    // ENV gate check (cached, should be fast)
+    if (!tiny_tcache_enabled()) {
+        return NULL;  // Tcache disabled, fall through to unified_cache
+    }
+
+    TinyTcacheBin* bin = &g_tiny_tcache_bins[class_idx];
+
+    // Check if empty
+    if (bin->head == NULL) {
+        return NULL;  // Miss, delegate to unified_cache
+    }
+
+    // LIFO pop: unlink head
+    void* base = bin->head;
+    void* next = tiny_next_load(base, class_idx);
+    bin->head = next;
+    bin->count--;
+
+    // Debug: validate popped pointer
+#if !HAKMEM_BUILD_RELEASE
+    if (base == NULL || (uintptr_t)base < 4096) {
+        fprintf(stderr, "[TINY_TCACHE] BUG: invalid base=%p in try_pop (class=%d)\n", base, class_idx);
+        abort();
+    }
+#endif
+
+    return base;  // Hit (BASE pointer)
+}
+
+// ============================================================================
+// Stats (optional, for diagnostics)
+// ============================================================================
+
+// Get current count for a class (debug/stats only)
+static inline uint16_t tiny_tcache_count(int class_idx) {
+    return g_tiny_tcache_bins[class_idx].count;
+}
+
+#endif  // TINY_TCACHE_BOX_H
diff --git a/core/box/tiny_tcache_env_box.c b/core/box/tiny_tcache_env_box.c
new file mode 100644
index 00000000..e20f1f7e
--- /dev/null
+++ b/core/box/tiny_tcache_env_box.c
@@ -0,0 +1,68 @@
+// ============================================================================
+// Phase 14 v1: Tiny tcache ENV Box (L0) - Implementation
+// ============================================================================
+
+#include "tiny_tcache_env_box.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+// ============================================================================
+// Global State
+// ============================================================================
+
+_Atomic int g_tiny_tcache_enabled = -1;
+_Atomic uint16_t g_tiny_tcache_cap = 0;
+
+// ============================================================================
+// Init (Cold Path)
+// ============================================================================
+
+int tiny_tcache_env_init(void) {
+    const char* env_enabled = getenv("HAKMEM_TINY_TCACHE");
+    const char* env_cap = getenv("HAKMEM_TINY_TCACHE_CAP");
+
+    int enabled = 0;  // default: OFF (opt-in)
+    uint16_t cap = 64;  // default: 64 (glibc tcache-like)
+
+    // Parse HAKMEM_TINY_TCACHE
+    if (env_enabled && (env_enabled[0] == '1' || strcmp(env_enabled, "true") == 0 || strcmp(env_enabled, "TRUE") == 0)) {
+        enabled = 1;
+    }
+
+    // Parse HAKMEM_TINY_TCACHE_CAP
+    if (env_cap && *env_cap) {
+        int parsed = atoi(env_cap);
+        if (parsed > 0 && parsed <= 65535) {
+            cap = (uint16_t)parsed;
+        }
+    }
+
+    // Cache results
+    atomic_store_explicit(&g_tiny_tcache_enabled, enabled, memory_order_relaxed);
+    atomic_store_explicit(&g_tiny_tcache_cap, cap, memory_order_relaxed);
+
+    // Log once (stderr for immediate visibility)
+    if (enabled) {
+        char msg[128];
+        int n = snprintf(msg, sizeof(msg), "[TINY_TCACHE] enabled (cap=%u)\n", (unsigned)cap);
+        if (n > 0 && n < (int)sizeof(msg)) {
+            ssize_t w = write(2, msg, (size_t)n);
+            (void)w;
+        }
+    }
+
+    return enabled;
+}
+
+// ============================================================================
+// Refresh (Cold Path, called from bench_profile)
+// ============================================================================
+
+void tiny_tcache_env_refresh_from_env(void) {
+    // Reset to uninitialized state (-1 / 0)
+    // Next call to tiny_tcache_enabled() / tiny_tcache_cap() will re-read ENV
+    atomic_store_explicit(&g_tiny_tcache_enabled, -1, memory_order_relaxed);
+    atomic_store_explicit(&g_tiny_tcache_cap, 0, memory_order_relaxed);
+}
diff --git a/core/box/tiny_tcache_env_box.h b/core/box/tiny_tcache_env_box.h
new file mode 100644
index 00000000..b60d2254
--- /dev/null
+++ b/core/box/tiny_tcache_env_box.h
@@ -0,0 +1,93 @@
+// ============================================================================
+// Phase 14 v1: Tiny tcache ENV Box (L0)
+// ============================================================================
+//
+// Purpose: ENV gate for tcache-style intrusive LIFO cache
+//
+// Design: docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
+// Instructions: docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md
+//
+// Strategy:
+//   - Add intrusive LIFO tcache layer before array-based UnifiedCache
+//   - Reduce pointer-chase overhead (system malloc tcache pattern)
+//   - Hit: head pointer + intrusive next only (no array access)
+//
+// ENV:
+//   HAKMEM_TINY_TCACHE=0/1 (default: 0, opt-in)
+//   HAKMEM_TINY_TCACHE_CAP=64 (default: 64, per-class capacity)
+//
+// API:
+//   tiny_tcache_enabled() -> int
+//   tiny_tcache_cap() -> uint16_t
+//   tiny_tcache_env_refresh_from_env()
+//
+// Box Theory:
+//   - L0: This file (ENV gate, reversible)
+//   - L1: tiny_tcache_box.h (intrusive LIFO logic)
+//   - L2: tiny_unified_cache.h (integration point)
+//
+// Safety:
+//   - ENV-gated (default OFF, opt-in)
+//   - Reversible (ENV toggle)
+//   - No call site changes (integration inside unified_cache)
+//
+// ============================================================================
+
+#ifndef TINY_TCACHE_ENV_BOX_H
+#define TINY_TCACHE_ENV_BOX_H
+
+#include <stdint.h>
+#include <stdatomic.h>
+
+// ============================================================================
+// Global State (L0)
+// ============================================================================
+
+// Cached state: -1 (uninitialized), 0 (disabled), 1 (enabled)
+extern _Atomic int g_tiny_tcache_enabled;
+
+// Cached capacity: 0 (uninitialized), >0 (cap value)
+extern _Atomic uint16_t g_tiny_tcache_cap;
+
+// ============================================================================
+// Hot Inline API (L0)
+// ============================================================================
+
+// Check if tcache is enabled
+// Returns: 1 if enabled, 0 if disabled
+static inline int tiny_tcache_enabled(void) {
+    int val = atomic_load_explicit(&g_tiny_tcache_enabled, memory_order_relaxed);
+
+    if (__builtin_expect(val == -1, 0)) {
+        // Lazy init: read ENV once
+        extern int tiny_tcache_env_init(void);
+        val = tiny_tcache_env_init();
+    }
+
+    return val;
+}
+
+// Get tcache capacity per class
+// Returns: capacity (default 64)
+static inline uint16_t tiny_tcache_cap(void) {
+    uint16_t cap = atomic_load_explicit(&g_tiny_tcache_cap, memory_order_relaxed);
+
+    if (__builtin_expect(cap == 0, 0)) {
+        // Lazy init: read ENV once
+        extern int tiny_tcache_env_init(void);
+        tiny_tcache_env_init();
+        cap = atomic_load_explicit(&g_tiny_tcache_cap, memory_order_relaxed);
+    }
+
+    return cap;
+}
+
+// ============================================================================
+// Cold API (L2)
+// ============================================================================
+
+// Refresh ENV cache (called from bench_profile after putenv)
+// Pattern: Same as Phase 8/13 (FREE_STATIC_ROUTE, C7_PRESERVE_HEADER)
+extern void tiny_tcache_env_refresh_from_env(void);
+
+#endif  // TINY_TCACHE_ENV_BOX_H
diff --git a/core/front/tiny_unified_cache.h b/core/front/tiny_unified_cache.h
index 54994e36..098cc58f 100644
--- a/core/front/tiny_unified_cache.h
+++ b/core/front/tiny_unified_cache.h
@@ -30,6 +30,7 @@
 #include "../hakmem_tiny_config.h"  // For TINY_NUM_CLASSES
 #include "../box/ptr_type_box.h"    // Phantom pointer types (BASE/USER)
 #include "../box/tiny_front_config_box.h"  // Phase 8-Step1: Config macros
+#include "../box/tiny_tcache_box.h"  // Phase 14 v1: Intrusive LIFO tcache
 
 // ============================================================================
 // Phase 3 C2 Patch 3: Bounds Check Compile-out
@@ -220,9 +221,16 @@ static inline int unified_cache_push(int class_idx, hak_base_ptr_t base) {
     // Fast path: Unified cache disabled → return 0 (not handled)
     if (__builtin_expect(!TINY_FRONT_UNIFIED_CACHE_ENABLED, 0)) return 0;
 
-    TinyUnifiedCache* cache = &g_unified_cache[class_idx];  // 1 cache miss (TLS)
     void* base_raw = HAK_BASE_TO_RAW(base);
 
+    // Phase 14 v1: Try tcache first (intrusive LIFO, no array access)
+    if (tiny_tcache_try_push(class_idx, base_raw)) {
+        return 1;  // SUCCESS (tcache hit, no array access)
+    }
+
+    // Tcache overflow or disabled → fall through to array cache
+    TinyUnifiedCache* cache = &g_unified_cache[class_idx];  // 1 cache miss (TLS)
+
     // Phase 8-Step3: Lazy init check (conditional in PGO mode)
     // PGO builds assume bench_fast_init() prewarmed cache → remove check (-1 branch)
     #if !HAKMEM_TINY_FRONT_PGO
@@ -281,7 +289,23 @@ static inline hak_base_ptr_t unified_cache_pop_or_refill(int class_idx) {
     }
     #endif
 
-    // Try pop from cache (fast path)
+    // Phase 14 v1: Try tcache first (intrusive LIFO, no array access)
+    void* tcache_base = tiny_tcache_try_pop(class_idx);
+    if (tcache_base != NULL) {
+#if !HAKMEM_BUILD_RELEASE
+        g_unified_cache_hit[class_idx]++;
+#endif
+        // Performance measurement: count cache hits (ENV enabled only)
+        if (__builtin_expect(unified_cache_measure_check(), 0)) {
+            atomic_fetch_add_explicit(&g_unified_cache_hits_global,
+                                      1, memory_order_relaxed);
+            atomic_fetch_add_explicit(&g_unified_cache_hits_by_class[class_idx],
+                                      1, memory_order_relaxed);
+        }
+        return HAK_BASE_FROM_RAW(tcache_base);  // HIT (tcache, no array access)
+    }
+
+    // Tcache miss or disabled → try pop from array cache (fast path)
     if (__builtin_expect(cache->head != cache->tail, 1)) {
         void* base = cache->slots[cache->head];  // 1 cache miss (array access)
         cache->head = (cache->head + 1) & cache->mask;
diff --git a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_AB_TEST_RESULTS.md b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_AB_TEST_RESULTS.md
new file mode 100644
index 00000000..7f737027
--- /dev/null
+++ b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_AB_TEST_RESULTS.md
@@ -0,0 +1,184 @@
+# Phase 14 v1: Pointer-Chase Reduction (tcache-style) A/B Test Results
+
+**Date:** 2025-12-15
+**Benchmark:** Mixed (16–1024B) 10-run cleanenv
+**Target:** Reduce pointer-chase overhead with intrusive LIFO tcache layer
+**Expected ROI:** +15-25% (design estimate)
+**GO Threshold:** +1.0% mean improvement
+
+---
+
+## 1. Implementation Summary
+
+Phase 14 v1 adds an intrusive LIFO tcache layer (L1) before the existing array-based UnifiedCache, inspired by glibc tcache pattern.
+
+**Key Components:**
+- `core/box/tiny_tcache_env_box.{h,c}` - L0 ENV gate (HAKMEM_TINY_TCACHE=0/1, default 0)
+- `core/box/tiny_tcache_box.h` - L1 intrusive LIFO cache (TLS per-class bins)
+- `core/front/tiny_unified_cache.h` - Integration (try tcache first, fall through to array cache)
+- `core/bench_profile.h` - Refresh sync for bench_profile
+
+**Important Note (wiring completeness):**
+- v1 の tcache pop は `unified_cache_pop_or_refill()` 側にあるが、現行の main alloc hot path（`tiny_hot_alloc_fast()`）は `unified_cache_pop_or_refill()` を経由しない。
+- 一方で free 側は `unified_cache_push()` 経由で tcache に入るため、`HAKMEM_TINY_TCACHE=1` のとき **tcache が “sink” になり、alloc/pop 側の ROI が測れない**可能性がある。
+- 後続の修正（Phase 14 v2）で `tiny_front_hot_box` に pop/push を接続し、再 A/B を推奨する:
+  - `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md`
+
+**Design:**
+- TLS state: 8 TinyTcacheBin structs (head pointer + count per class)
+- Intrusive next pointers stored in blocks (via tiny_next_store/load SSOT)
+- Capacity: 64 blocks per class (default, configurable via HAKMEM_TINY_TCACHE_CAP)
+- LIFO order: better cache locality than FIFO array cache
+- Two-layer fallback: tcache (fast) → unified_cache (overflow/miss)
+
+**ENV Control:**
+```bash
+export HAKMEM_TINY_TCACHE=0  # Baseline (tcache disabled)
+export HAKMEM_TINY_TCACHE=1  # Optimized (tcache enabled)
+export HAKMEM_TINY_TCACHE_CAP=64  # Capacity per class (default: 64)
+```
+
+---
+
+## 2. A/B Test Results (Mixed 10-run)
+
+### Baseline (TCACHE=0):
+```
+Run 1:  51,264,525 ops/s
+Run 2:  50,950,925 ops/s
+Run 3:  51,500,295 ops/s
+Run 4:  51,698,050 ops/s
+Run 5:  50,396,686 ops/s
+Run 6:  50,960,807 ops/s
+Run 7:  50,616,179 ops/s
+Run 8:  51,817,424 ops/s
+Run 9:  50,762,958 ops/s
+Run 10: 50,865,941 ops/s
+```
+**Mean:** 51,083,379 ops/s
+**Median:** 50,955,866 ops/s
+
+### Optimized (TCACHE=1):
+```
+Run 1:  51,555,414 ops/s
+Run 2:  51,389,988 ops/s
+Run 3:  50,795,917 ops/s
+Run 4:  51,880,520 ops/s
+Run 5:  50,574,457 ops/s
+Run 6:  50,627,901 ops/s
+Run 7:  51,233,081 ops/s
+Run 8:  51,278,890 ops/s
+Run 9:  50,761,326 ops/s
+Run 10: 51,770,890 ops/s
+```
+**Mean:** 51,186,838 ops/s
+**Median:** 51,255,986 ops/s
+
+### Delta:
+- **Mean delta:** +0.20% (103,459 ops/s improvement)
+- **Median delta:** +0.59% (300,120 ops/s improvement)
+
+---
+
+## 3. Verdict: NEUTRAL
+
+**Result:** +0.20% mean improvement (below +1.0% GO threshold)
+
+**Analysis:**
+- Phase 14 v1 shows minimal performance impact on Mixed workload
+- Median delta (+0.59%) is slightly better than mean, suggesting some stability improvement
+- Both deltas are below the +1.0% GO threshold → NEUTRAL classification
+- Expected ROI (+15-25%) was not achieved
+
+**Possible Reasons for Lower-than-Expected ROI:**
+1. **Workload Mismatch:** Mixed workload (16–1024B) spans multiple classes (C0-C7), but tcache benefits may be concentrated in hot classes (C2/C3: 128B/256B). Mid/large classes (C5-C7) may not benefit as much.
+2. **Cache Locality vs Array Access:** While tcache reduces pointer-chasing, the existing UnifiedCache array access may already be well-cached in L1/L2, limiting improvement.
+3. **Cap Too Small:** Default cap=64 may be too small for high-churn workloads, causing frequent overflow to array cache.
+4. **Intrusive Next Overhead:** Writing/reading next pointers may add overhead that offsets the pointer-chase reduction.
+5. **Incomplete hot-path coverage (v1):** Free 側だけ tcache に入って alloc 側が消費しないため、hit が “見えない” 可能性がある（Phase 14 v2 で通電確認が必要）。
+
+**Comparison to Smoke Test:**
+- Smoke test (single run): +2.4% (51.88M vs 50.68M ops/s)
+- Formal 10-run: +0.20% mean, +0.59% median
+- Variance across runs suggests smoke test was an outlier
+
+---
+
+## 4. Recommendation: Freeze as Research Box
+
+**Decision:** Freeze Phase 14 v1 as research box (default OFF)
+
+**Rationale:**
+- NEUTRAL result (+0.20%) does not justify promotion to default
+- No measurable harm (close to baseline), suitable for research/experimentation
+- Future work may explore:
+  - Per-class cap tuning (hot classes get larger caps)
+  - Workload-specific profiling (C2/C3-heavy vs C5-C7-heavy)
+  - Alternative intrusive next pointer strategies
+
+**Next Steps:**
+1. Commit Phase 14 v1 implementation with NEUTRAL verdict
+2. Update CURRENT_TASK.md to freeze as research box
+3. Keep ENV gate (HAKMEM_TINY_TCACHE=0 default) for future experimentation
+4. Consider alternative approaches for pointer-chase reduction (e.g., deeper pipeline optimization, better prefetching)
+
+---
+
+## 5. Raw Data
+
+### Baseline (TCACHE=0):
+```
+51264525
+50950925
+51500295
+51698050
+50396686
+50960807
+50616179
+51817424
+50762958
+50865941
+```
+Mean: 51,083,379 ops/s
+Median: 50,955,866 ops/s
+
+### Optimized (TCACHE=1):
+```
+51555414
+51389988
+50795917
+51880520
+50574457
+50627901
+51233081
+51278890
+50761326
+51770890
+```
+Mean: 51,186,838 ops/s
+Median: 51,255,986 ops/s
+
+---
+
+## 6. Files Modified
+
+### Created:
+- `core/box/tiny_tcache_env_box.h` - L0 ENV gate
+- `core/box/tiny_tcache_env_box.c` - ENV init/refresh implementation
+- `core/box/tiny_tcache_box.h` - L1 intrusive LIFO cache
+
+### Modified:
+- `core/front/tiny_unified_cache.h` - Integration (try tcache first)
+- `core/bench_profile.h` - Refresh sync
+- `Makefile` - Build system integration
+- `scripts/run_mixed_10_cleanenv.sh` - ENV leak prevention (already updated)
+
+---
+
+## 7. Conclusion
+
+Phase 14 v1 (Pointer-Chase Reduction via tcache-style intrusive LIFO) achieved **+0.20% mean improvement** on Mixed 10-run benchmark, which is **NEUTRAL** (below +1.0% GO threshold).
+
+**Final Status:** Freeze as research box (HAKMEM_TINY_TCACHE=0 default, OFF)
+
+**Future Work:** Consider per-class cap tuning or alternative pointer-chase reduction strategies.
diff --git a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
index caf63702..574803ad 100644
--- a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
+++ b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_DESIGN.md
@@ -147,3 +147,12 @@ GO/NO-GO:
 - tcache hit 率が高い場合、配列アクセス・FIFO の古い再利用を回避できる
 - “system malloc が速い” の差分（tcache 的挙動）に寄せる最短の一手
 
+---
+
+## Update（2025-12-15）
+
+v1 の統合点（`core/front/tiny_unified_cache.h`）だけでは、現行の main alloc hot path（`tiny_hot_alloc_fast()`）が tcache を消費しないため、
+`HAKMEM_TINY_TCACHE=1` のとき tcache が “sink” になりやすい。
+
+次は hot path（`core/box/tiny_front_hot_box.h`）へ pop/push を接続して、通電した状態で再 A/B を取る（Phase 14 v2）:
+- `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md`
diff --git a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md
index 4e7dac60..9320329e 100644
--- a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md
+++ b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_NEXT_INSTRUCTIONS.md
@@ -109,3 +109,12 @@ GO のとき:
 NO-GO/NEUTRAL のとき:
 - research box freeze（default OFF のまま保持）
 
+---
+
+## Update（2025-12-15）
+
+v1 の統合点（`core/front/tiny_unified_cache.h`）だけだと、現行の main alloc hot path（`tiny_hot_alloc_fast()`）が tcache を消費しないため、
+`HAKMEM_TINY_TCACHE=1` で “sink” になりやすい。
+
+次は hot path（`core/box/tiny_front_hot_box.h`）へ pop/push を接続し、通電した状態で再 A/B を取る（Phase 14 v2）:
+- `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md`
diff --git a/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md
new file mode 100644
index 00000000..13fb4370
--- /dev/null
+++ b/docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_2_NEXT_INSTRUCTIONS.md
@@ -0,0 +1,131 @@
+# Phase 14 v2: Pointer-Chase Reduction — Hot Path Integration Next Instructions（Tiny tcache intrusive LIFO）
+
+## Status
+
+- Phase 14 v1（tcache L1 追加）は Mixed 10-run で **NEUTRAL**（+0.20% mean / +0.59% median）
+  - 結果: `docs/analysis/PHASE14_POINTER_CHASE_REDUCTION_1_AB_TEST_RESULTS.md`
+  - 実装: `core/box/tiny_tcache_env_box.{h,c}` / `core/box/tiny_tcache_box.h` / `core/front/tiny_unified_cache.h`
+- ただし現状の v1 は **free 側（`unified_cache_push()`）だけ tcache に入れて、alloc 側（`tiny_hot_alloc_fast()`）が tcache を消費しない**ため、
+  - tcache が「実質 sink」になり、ROI が正しく測れない
+  - “tcache-style” の前提（push/pop の対称）が崩れている
+
+Phase 14 v2 は **tiny front の実ホットパス**に tcache を接続して、正しい A/B を取り直す。
+
+---
+
+## 0. 目的（GO 条件）
+
+Mixed 10-run（clean env）で:
+- **GO**: mean +1.0% 以上
+- **NO-GO**: mean -1.0% 以下（即 rollback / freeze）
+- **NEUTRAL**: ±1.0%（research box freeze）
+
+追加ゲート（必須）:
+- `HAKMEM_TINY_TCACHE=1` のとき **tcache pop が実際に発生**している（0 なら設計未通電）
+
+---
+
+## 1. Box 図（境界 1 箇所）
+
+```
+L0: tiny_tcache_env_box        (ENV gate / refresh / rollback)
+  ↓
+L1: tiny_tcache_box            (intrusive LIFO: push/pop, cap)
+  ↓
+L2: tiny_front_hot_box         (hot alloc/free: tcache → unified_cache(FIFO))
+  ↓
+L3: cold/refill                (unified_cache_refill → SuperSlab)
+```
+
+境界は **“tcache miss/overflow → 既存 UnifiedCache”** の 1 箇所に固定する。
+
+---
+
+## 2. 実装パッチ順（小さく積む）
+
+### Patch 1: Hot alloc に tcache pop を接続（必須）
+
+対象:
+- `core/box/tiny_front_hot_box.h`
+
+変更:
+- `tiny_hot_alloc_fast(int class_idx)` の先頭で
+  - `tiny_tcache_try_pop(class_idx)` を試す
+  - HIT なら `tiny_header_finalize_alloc(base, class_idx)` で即 return
+  - MISS なら既存の FIFO（`cache->slots[head]`）へフォールバック
+
+要件:
+- tcache OFF（default）ではホット経路が肥大しないよう最小差分にする
+- “確信がないなら fallback” を厳守（Fail-Fast）
+
+### Patch 2: Hot free に tcache push を接続（推奨）
+
+対象:
+- `core/box/tiny_front_hot_box.h`
+
+変更:
+- `tiny_hot_free_fast(int class_idx, void* base)` の先頭で
+  - `tiny_tcache_try_push(class_idx, base)` を試す
+  - SUCCESS なら `return 1`
+  - overflow / disabled のときだけ既存 FIFO へ
+
+狙い:
+- `unified_cache_push()` 経由以外の “直 push” 経路でも tcache が効く状態にする
+
+### Patch 3: 可視化（最小・TLS）
+
+対象候補:
+- `core/box/tiny_tcache_box.h`（TLS カウンタ）
+
+追加（debug / research 用）:
+- `tcache_pop_hit/miss`
+- `tcache_push_hit/overflow`
+- “ワンショット dump” を 1 回だけ（ENV opt-in）で出せるようにする
+
+禁止:
+- hot path に atomic 統計を置かない（Phase 12 / POOL-DN-BATCH の教訓）
+
+---
+
+## 3. A/B テスト（同一バイナリ）
+
+Baseline:
+```sh
+HAKMEM_TINY_TCACHE=0 scripts/run_mixed_10_cleanenv.sh
+```
+
+Optimized:
+```sh
+HAKMEM_TINY_TCACHE=1 scripts/run_mixed_10_cleanenv.sh
+```
+
+追加（効果が class 依存か確認）:
+```sh
+HAKMEM_BENCH_C7_ONLY=1 HAKMEM_TINY_TCACHE=0 scripts/run_mixed_10_cleanenv.sh
+HAKMEM_BENCH_C7_ONLY=1 HAKMEM_TINY_TCACHE=1 scripts/run_mixed_10_cleanenv.sh
+```
+
+cap 探索（research、必要なときだけ）:
+```sh
+HAKMEM_TINY_TCACHE=1 HAKMEM_TINY_TCACHE_CAP=32  scripts/run_mixed_10_cleanenv.sh
+HAKMEM_TINY_TCACHE=1 HAKMEM_TINY_TCACHE_CAP=64  scripts/run_mixed_10_cleanenv.sh
+HAKMEM_TINY_TCACHE=1 HAKMEM_TINY_TCACHE_CAP=128 scripts/run_mixed_10_cleanenv.sh
+```
+
+---
+
+## 4. 健康診断（必須）
+
+```sh
+scripts/verify_health_profiles.sh
+```
+
+---
+
+## 5. 判定と扱い
+
+- GO: `bench_profile` への昇格は **MIXED_TINYV3_C7_SAFE のみ**から開始（段階的）
+- NEUTRAL/NO-GO: Phase 14 v2 は research box として freeze（default OFF のまま）
+- Rollback:
+  - `export HAKMEM_TINY_TCACHE=0`
+