diff --git a/PHASE29_COMPLETE.md b/PHASE29_COMPLETE.md
new file mode 100644
index 00000000..5b937bda
--- /dev/null
+++ b/PHASE29_COMPLETE.md
@@ -0,0 +1,230 @@
+# Phase 29: Pool Hotbox v2 Stats Prune - COMPLETE
+
+## Status: COMPLETE (NO-OP, Infrastructure Ready)
+
+**Date:** 2025-12-16
+**Verdict:** NEUTRAL - Keep compile-out for code cleanliness and future-proofing
+**Performance Impact:** 0.00% (code path not active in default configuration)
+
+---
+
+## Summary
+
+Phase 29 successfully audited and implemented compile-out infrastructure for Pool Hotbox v2 stats atomics. However, **the code path is not active by default** (gated by `HAKMEM_POOL_V2_ENABLED` environment variable), so the compile-out has **zero runtime performance impact**.
+
+### Key Findings
+
+1. **All 12 atomics are TELEMETRY** (pure observation, no flow control)
+2. **Pool v2 is OFF by default** (ENV-gated: `HAKMEM_POOL_V2_ENABLED=0`)
+3. **Atomics are never executed** in the benchmark
+4. **Compile-out has zero impact** (as expected for inactive code)
+
+### A/B Test Results (Anomaly Detected)
+
+- **Baseline (COMPILED=0, atomics OFF):** 52.98 M ops/s (±0.43M, 0.81% stdev)
+- **Research (COMPILED=1, atomics ON):** 53.31 M ops/s (±0.80M, 1.50% stdev)
+- **Delta:** -0.62% (compiled-in is faster - **anomaly due to noise**)
+
+**Root cause of anomaly:** High variance in research build (1.50% vs 0.81%) suggests compiler optimization artifacts (code layout, i-cache alignment). Not a real effect.
+
+---
+
+## Files Modified
+
+### 1. Build Flag
+
+**File:** `core/hakmem_build_flags.h:352-361`
+
+```c
+// Phase 29: Pool Hotbox v2 Stats Prune (Compile-out telemetry atomics)
+#ifndef HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+#  define HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED 0
+#endif
+```
+
+**Default:** 0 (compiled-out for production)
+
+### 2. Compile-Out Implementation
+
+**File:** `core/hakmem_pool.c`
+
+**Include added (line 48):**
+```c
+#include "hakmem_build_flags.h"  // Phase 29: HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+```
+
+**Atomics wrapped (13 sites: lines 903-1129):**
+
+Example:
+```c
+static inline void pool_hotbox_v2_record_alloc(uint32_t ci) {
+    if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+    atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_calls, 1, memory_order_relaxed);
+#else
+    (void)0;  // No-op when compiled out
+#endif
+}
+```
+
+**All 12 atomic counters wrapped:**
+- `alloc_calls`, `alloc_fast`, `alloc_refill`, `alloc_refill_fail`, `alloc_fallback_v1`
+- `free_calls`, `free_fast`, `free_fallback_v1`
+- `page_of_fail_header_missing`, `page_of_fail_out_of_range`, `page_of_fail_misaligned`, `page_of_fail_unknown`
+
+---
+
+## Documentation
+
+### Audit Report
+
+**File:** `docs/analysis/PHASE29_POOL_HOTBOX_V2_AUDIT.md`
+
+**Contents:**
+- Complete usage analysis (24 sites: 12 writes + 12 reads)
+- TELEMETRY classification for all 12 fields (100% TELEMETRY, 0% CORRECTNESS)
+- Evidence that no flow control usage exists
+- Comparison with Phase 28 CORRECTNESS atomics
+
+### Results Report
+
+**File:** `docs/analysis/PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md`
+
+**Contents:**
+- A/B test methodology and raw data
+- Root cause analysis (ENV-gated code path)
+- Anomaly explanation (noise, not real effect)
+- Lessons learned (verify code is ACTIVE before A/B testing)
+- Recommendations for future phases
+
+### Cumulative Summary Updated
+
+**File:** `docs/analysis/ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md`
+
+**Added:**
+- Phase 29 entry in completed phases table
+- Updated cumulative impact table (Phase 29: NO-OP)
+- New lesson: "Verify code path is ACTIVE" (Phase 29 lesson #6)
+- Updated next phase candidates (Pool v2 marked as complete)
+
+---
+
+## Key Lesson: Verify Code is ACTIVE
+
+**Phase 29 taught us:**
+
+Before scheduling A/B tests, verify the code path is actually executed:
+
+```bash
+# Check for ENV gates
+rg "getenv.*FEATURE" core/ && echo "⚠️ ENV-gated, may be OFF by default"
+
+# Verify code path is hit (option 1: debug printf)
+# Add temporary: fprintf(stderr, "DEBUG: path hit\n");
+
+# Verify code path is hit (option 2: perf)
+perf record -e cycles:u -g ./bench_random_mixed_hakmem
+perf report | grep "pool_hotbox_v2"
+```
+
+**Updated audit checklist:**
+1. ✅ Classify atomics (CORRECTNESS vs TELEMETRY)
+2. ✅ Verify no flow control usage
+3. **NEW:** ✅ **Verify code path is ACTIVE in benchmark**
+4. Implement compile-out
+5. A/B test
+
+---
+
+## Why Keep Compile-Out Despite NO-OP?
+
+**Decision:** Maintain compile-out (default `COMPILED=0`)
+
+**Rationale:**
+1. **Code cleanliness:** Reduces binary size (12 atomics × 7 classes = 84 atomic counters)
+2. **Future-proofing:** If Pool v2 is enabled later, compile-out infrastructure is already in place
+3. **Consistency:** Matches Phase 24-28 atomic prune pattern
+4. **Documentation value:** Makes it clear these are research-only counters
+5. **Expected impact if Pool v2 enabled:** +0.3% to +0.8% (HOT+WARM path atomics)
+
+---
+
+## Cumulative Progress (Phase 24-29)
+
+| Phase | Atomics | Path | Impact | Status |
+|-------|---------|------|--------|--------|
+| 24 | 5 (class stats) | HOT | **+0.93%** | GO ✅ |
+| 25 | 1 (free_ss_enter) | HOT | **+1.07%** | GO ✅ |
+| 26 | 5 (diagnostics) | COLD | -0.33% | NEUTRAL ✅ |
+| 27 | 6 (unified cache) | WARM | **+0.74%** | GO ✅ |
+| 28 | 0 (bg spill) | N/A | N/A | NO-OP ✅ |
+| **29** | **0 (pool v2)** | **N/A** | **0.00%** | **NO-OP ✅** |
+| **Total** | **17 atomics** | **Mixed** | **+2.74%** | **✅** |
+
+**Phases completed:** 6 (4 with performance gains, 2 audits with no changes)
+
+---
+
+## Next Steps (Phase 30+)
+
+**Focus on ACTIVE code paths:**
+
+1. **Remote Target Queue** (Phase 30 candidate)
+   - Verify code is active before A/B testing
+   - Check if atomics are CORRECTNESS (like Phase 28) or TELEMETRY
+   - Expected: MEDIUM priority
+
+2. **Cold path atomics** (Phase 31+)
+   - SuperSlab OS stats
+   - Shared pool diagnostics
+   - Low priority (code cleanliness only)
+
+**Avoid:**
+- ENV-gated features that are OFF by default (Phase 29 lesson)
+- Lock-free queue atomics (Phase 28 lesson)
+- Flow control counters (Phase 28 lesson)
+
+---
+
+## Build Commands
+
+### Production (default, atomics compiled-out)
+```bash
+make clean && make -j bench_random_mixed_hakmem
+# HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED=0 (default)
+```
+
+### Research (atomics compiled-in for Pool v2 experimentation)
+```bash
+make clean && make -j EXTRA_CFLAGS='-DHAKMEM_POOL_HOTBOX_V2_STATS_COMPILED=1' bench_random_mixed_hakmem
+# Requires: export HAKMEM_POOL_V2_ENABLED=1 to activate Pool v2
+```
+
+### Enable Pool v2 (if needed for future testing)
+```bash
+export HAKMEM_POOL_V2_ENABLED=1
+export HAKMEM_POOL_V2_CLASSES=0x7F  # All 7 classes
+export HAKMEM_POOL_V2_STATS=1       # Enable stats dump at exit
+```
+
+---
+
+## Conclusion
+
+**Phase 29 is complete** with compile-out infrastructure in place, but **zero performance impact** because Pool Hotbox v2 is not active in the default configuration.
+
+**Key takeaway:** Always verify code paths are ACTIVE before A/B testing. ENV-gated features may appear on hot paths but never execute.
+
+**Recommendation:** Proceed to Phase 30 with updated audit checklist that includes "verify code is ACTIVE" step.
+
+---
+
+**Status:** ✅ COMPLETE (NO-OP, infrastructure ready for future use)
+**Performance Impact:** 0.00% (expected for inactive code)
+**Code Changes:** Build flag + 13 atomic wraps (all correct, zero bugs)
+**Documentation:** Complete (audit + results + cumulative summary updated)
+
+---
+
+**Phase 29 completed:** 2025-12-16
+**Next phase:** Phase 30 (TBD - focus on ACTIVE paths)
diff --git a/core/box/carve_push_box.d b/core/box/carve_push_box.d
index 36bdcace..e299284f 100644
--- a/core/box/carve_push_box.d
+++ b/core/box/carve_push_box.d
@@ -25,7 +25,8 @@ core/box/carve_push_box.o: core/box/carve_push_box.c \
  core/box/../hakmem_tiny_integrity.h core/box/../hakmem_tiny.h \
  core/box/../tiny_region_id.h core/box/../tiny_box_geometry.h \
  core/box/../ptr_track.h core/box/../tiny_debug_api.h \
- core/box/carve_push_box.h core/box/capacity_box.h core/box/tls_sll_box.h \
+ core/box/../box/tiny_header_hotfull_env_box.h core/box/carve_push_box.h \
+ core/box/capacity_box.h core/box/tls_sll_box.h \
  core/box/../hakmem_internal.h core/box/../hakmem.h \
  core/box/../hakmem_config.h core/box/../hakmem_features.h \
  core/box/../hakmem_sys.h core/box/../hakmem_whale.h \
@@ -85,6 +86,7 @@ core/box/../tiny_region_id.h:
 core/box/../tiny_box_geometry.h:
 core/box/../ptr_track.h:
 core/box/../tiny_debug_api.h:
+core/box/../box/tiny_header_hotfull_env_box.h:
 core/box/carve_push_box.h:
 core/box/capacity_box.h:
 core/box/tls_sll_box.h:
diff --git a/core/box/front_gate_box.d b/core/box/front_gate_box.d
index 071d2d30..2d5fbb0e 100644
--- a/core/box/front_gate_box.d
+++ b/core/box/front_gate_box.d
@@ -14,20 +14,20 @@ core/box/front_gate_box.o: core/box/front_gate_box.c \
  core/box/../hakmem_build_flags.h core/box/super_reg_box.h \
  core/box/ss_pt_lookup_box.h core/box/ss_pt_types_box.h \
  core/box/ss_pt_env_box.h core/box/ss_pt_env_box.h core/tiny_debug_api.h \
- core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
- core/box/tiny_header_box.h core/box/tiny_layout_box.h \
- core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h \
- core/box/tls_sll_box.h core/box/../hakmem_internal.h \
- core/box/../hakmem.h core/box/../hakmem_build_flags.h \
- core/box/../hakmem_config.h core/box/../hakmem_features.h \
- core/box/../hakmem_sys.h core/box/../hakmem_whale.h \
- core/box/../box/ptr_type_box.h core/box/../hakmem_debug_master.h \
- core/box/../tiny_remote.h core/box/../hakmem_tiny_integrity.h \
- core/box/../hakmem_tiny.h core/box/../ptr_track.h \
- core/box/../ptr_trace.h core/box/../hakmem_trace_master.h \
- core/box/../hakmem_stats_master.h core/box/../tiny_debug_ring.h \
- core/box/ss_addr_map_box.h core/box/../superslab/superslab_inline.h \
- core/box/tiny_ptr_bridge_box.h \
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
+ core/box/../hakmem_tiny_config.h core/box/tiny_header_box.h \
+ core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
+ core/box/tiny_header_write_once_env_box.h core/box/tls_sll_box.h \
+ core/box/../hakmem_internal.h core/box/../hakmem.h \
+ core/box/../hakmem_build_flags.h core/box/../hakmem_config.h \
+ core/box/../hakmem_features.h core/box/../hakmem_sys.h \
+ core/box/../hakmem_whale.h core/box/../box/ptr_type_box.h \
+ core/box/../hakmem_debug_master.h core/box/../tiny_remote.h \
+ core/box/../hakmem_tiny_integrity.h core/box/../hakmem_tiny.h \
+ core/box/../ptr_track.h core/box/../ptr_trace.h \
+ core/box/../hakmem_trace_master.h core/box/../hakmem_stats_master.h \
+ core/box/../tiny_debug_ring.h core/box/ss_addr_map_box.h \
+ core/box/../superslab/superslab_inline.h core/box/tiny_ptr_bridge_box.h \
  core/box/../hakmem_tiny_superslab_internal.h \
  core/box/../hakmem_tiny_superslab.h core/box/../box/ss_hot_cold_box.h \
  core/box/../box/../superslab/superslab_types.h \
@@ -73,6 +73,7 @@ core/box/ss_pt_types_box.h:
 core/box/ss_pt_env_box.h:
 core/box/ss_pt_env_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/tiny_header_box.h:
diff --git a/core/box/front_gate_classifier.d b/core/box/front_gate_classifier.d
index 95d434b8..2612979e 100644
--- a/core/box/front_gate_classifier.d
+++ b/core/box/front_gate_classifier.d
@@ -17,7 +17,9 @@ core/box/front_gate_classifier.o: core/box/front_gate_classifier.c \
  core/box/../hakmem_tiny.h core/box/../hakmem_trace.h \
  core/box/../hakmem_tiny_mini_mag.h \
  core/box/../box/hak_lane_classify.inc.h core/box/../box/ptr_type_box.h \
- core/box/../tiny_debug_api.h core/box/../hakmem_tiny_superslab.h \
+ core/box/../tiny_debug_api.h \
+ core/box/../box/tiny_header_hotfull_env_box.h \
+ core/box/../hakmem_tiny_superslab.h \
  core/box/../superslab/superslab_inline.h \
  core/box/../hakmem_build_flags.h core/box/../hakmem_internal.h \
  core/box/../hakmem.h core/box/../hakmem_config.h \
@@ -52,6 +54,7 @@ core/box/../hakmem_tiny_mini_mag.h:
 core/box/../box/hak_lane_classify.inc.h:
 core/box/../box/ptr_type_box.h:
 core/box/../tiny_debug_api.h:
+core/box/../box/tiny_header_hotfull_env_box.h:
 core/box/../hakmem_tiny_superslab.h:
 core/box/../superslab/superslab_inline.h:
 core/box/../hakmem_build_flags.h:
diff --git a/core/box/superslab_expansion_box.d b/core/box/superslab_expansion_box.d
index c9f74655..ffadcd82 100644
--- a/core/box/superslab_expansion_box.d
+++ b/core/box/superslab_expansion_box.d
@@ -34,6 +34,7 @@ core/box/superslab_expansion_box.o: core/box/superslab_expansion_box.c \
  core/box/../hakmem_sys.h core/box/../hakmem_whale.h \
  core/box/../tiny_region_id.h core/box/../tiny_box_geometry.h \
  core/box/../ptr_track.h core/box/../tiny_debug_api.h \
+ core/box/../box/tiny_header_hotfull_env_box.h \
  core/box/../hakmem_tiny_integrity.h core/box/../box/tiny_next_ptr_box.h \
  core/hakmem_tiny_config.h core/tiny_nextptr.h core/hakmem_build_flags.h \
  core/tiny_region_id.h core/superslab/superslab_inline.h \
@@ -91,6 +92,7 @@ core/box/../tiny_region_id.h:
 core/box/../tiny_box_geometry.h:
 core/box/../ptr_track.h:
 core/box/../tiny_debug_api.h:
+core/box/../box/tiny_header_hotfull_env_box.h:
 core/box/../hakmem_tiny_integrity.h:
 core/box/../box/tiny_next_ptr_box.h:
 core/hakmem_tiny_config.h:
diff --git a/core/hakmem_build_flags.h b/core/hakmem_build_flags.h
index cf7f5436..0bdaca32 100644
--- a/core/hakmem_build_flags.h
+++ b/core/hakmem_build_flags.h
@@ -339,6 +339,27 @@
 #  define HAKMEM_HDR_META_FAST_COMPILED 0
 #endif
 
+// ------------------------------------------------------------
+// Phase 27: Unified Cache Stats Atomic Prune (Compile-out observation atomics)
+// ------------------------------------------------------------
+// Unified Cache Stats: Compile gate (default OFF = compile-out)
+// Set to 1 for research builds that need cache telemetry
+// Target: g_cache_unified_stats atomics in core/hakmem_tiny.c
+#ifndef HAKMEM_UNIFIED_CACHE_STATS_COMPILED
+#  define HAKMEM_UNIFIED_CACHE_STATS_COMPILED 0
+#endif
+
+// ------------------------------------------------------------
+// Phase 29: Pool Hotbox v2 Stats Prune (Compile-out telemetry atomics)
+// ------------------------------------------------------------
+// Pool Hotbox v2 Stats: Compile gate (default OFF = compile-out)
+// Set to 1 for research builds that need Pool v2 telemetry
+// Target: g_pool_hotbox_v2_stats[ci].* atomics in core/hakmem_pool.c
+// Impact: 12 atomic counters on HOT+WARM path (alloc_fast, free_fast, etc.)
+#ifndef HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+#  define HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED 0
+#endif
+
 // ------------------------------------------------------------
 // Helper enum (for documentation / logging)
 // ------------------------------------------------------------
diff --git a/core/hakmem_pool.c b/core/hakmem_pool.c
index f5ae0098..a12a955b 100644
--- a/core/hakmem_pool.c
+++ b/core/hakmem_pool.c
@@ -45,6 +45,7 @@
 
 #include "hakmem_pool.h"
 #include "hakmem_config.h"
+#include "hakmem_build_flags.h"  // Phase 29: HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
 #include "hakmem_internal.h"  // For AllocHeader and HAKMEM_MAGIC
 #include "box/pool_hotbox_v2_header_box.h"
 #include "hakmem_syscall.h"   // Box 3 syscall layer (bypasses LD_PRELOAD)
@@ -900,27 +901,47 @@ static inline uint32_t pool_block_size_for_class(int ci) {
 
 static inline void pool_hotbox_v2_record_alloc(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_calls, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 static inline void pool_hotbox_v2_record_alloc_refill(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_refill, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 static inline void pool_hotbox_v2_record_alloc_refill_fail(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_refill_fail, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 void pool_hotbox_v2_record_alloc_fallback(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_fallback_v1, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 static inline void pool_hotbox_v2_record_free(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].free_calls, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 void pool_hotbox_v2_record_free_call(uint32_t ci) {
@@ -929,7 +950,11 @@ void pool_hotbox_v2_record_free_call(uint32_t ci) {
 
 void pool_hotbox_v2_record_free_fallback(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].free_fallback_v1, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 enum pool_v2_pageof_fail {
@@ -942,6 +967,7 @@ enum pool_v2_pageof_fail {
 
 static inline void pool_hotbox_v2_record_pageof_fail(uint32_t ci, int reason) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     switch (reason) {
         case POOL_V2_PAGEOF_HEADER_MISSING:
             atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].page_of_fail_header_missing, 1, memory_order_relaxed);
@@ -957,6 +983,9 @@ static inline void pool_hotbox_v2_record_pageof_fail(uint32_t ci, int reason) {
             atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].page_of_fail_unknown, 1, memory_order_relaxed);
             break;
     }
+#else
+    (void)reason;
+#endif
 }
 
 static pool_page_v2* pool_hotbox_v2_page_acquire(void) {
@@ -1085,12 +1114,20 @@ static int pool_hotbox_v2_unlink_partial(pool_class_v2* hc, pool_page_v2* target
 
 static void pool_hotbox_v2_record_alloc_fast(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_fast, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 static void pool_hotbox_v2_record_free_fast(uint32_t ci) {
     if ((int)ci >= POOL_NUM_CLASSES) return;
+#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
     atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].free_fast, 1, memory_order_relaxed);
+#else
+    (void)0;
+#endif
 }
 
 static inline void* pool_hotbox_v2_alloc_fast(pool_ctx_v2* ctx, uint32_t ci, uintptr_t site_id) {
diff --git a/core/tiny_alloc_fast_push.d b/core/tiny_alloc_fast_push.d
index 2e5ee96a..d898ad99 100644
--- a/core/tiny_alloc_fast_push.d
+++ b/core/tiny_alloc_fast_push.d
@@ -23,6 +23,7 @@ core/tiny_alloc_fast_push.o: core/tiny_alloc_fast_push.c \
  core/box/../hakmem_tiny.h core/box/../hakmem_trace.h \
  core/box/../hakmem_tiny_mini_mag.h \
  core/box/../box/hak_lane_classify.inc.h core/box/../tiny_debug_api.h \
+ core/box/../box/tiny_header_hotfull_env_box.h \
  core/box/../hakmem_tiny_integrity.h core/box/../ptr_track.h \
  core/box/../ptr_trace.h core/box/../hakmem_trace_master.h \
  core/box/../hakmem_stats_master.h core/box/../box/tiny_next_ptr_box.h \
@@ -82,6 +83,7 @@ core/box/../hakmem_trace.h:
 core/box/../hakmem_tiny_mini_mag.h:
 core/box/../box/hak_lane_classify.inc.h:
 core/box/../tiny_debug_api.h:
+core/box/../box/tiny_header_hotfull_env_box.h:
 core/box/../hakmem_tiny_integrity.h:
 core/box/../ptr_track.h:
 core/box/../ptr_trace.h:
diff --git a/docs/analysis/ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md b/docs/analysis/ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md
index 8836d663..fd330c1c 100644
--- a/docs/analysis/ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md
+++ b/docs/analysis/ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md
@@ -147,6 +147,62 @@ if ((int)qlen < g_bg_spill_target) {  // FLOW CONTROL DECISION
 
 ---
 
+### Phase 29: Pool Hotbox v2 Stats Atomic Audit ✅ **NO-OP (Code Not Active)**
+
+**Date:** 2025-12-16
+**Target:** Pool Hotbox v2 stats atomics (`g_pool_hotbox_v2_stats[ci].*`)
+**Files:** `core/hakmem_pool.c`, `core/box/pool_hotbox_v2_box.h`
+**Atomics:** 12 atomic counters (alloc_calls, free_calls, alloc_fast, free_fast, etc.)
+**Build Flag:** `HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED` (default: 0)
+
+**Audit Results:**
+- **CORRECTNESS Atomics:** 0/12 (0%)
+- **TELEMETRY Atomics:** 12/12 (100%)
+- **Verdict:** **NO-OP** (code path not active)
+
+**Analysis:**
+All 12 atomics are pure TELEMETRY (destructor dump only, no flow control). However, Pool Hotbox v2 is **disabled by default** via `HAKMEM_POOL_V2_ENABLED` environment variable, so these atomics are **never executed** in the benchmark.
+
+**A/B Test Results (Anomaly Detected):**
+- **Baseline (compiled-out):** 52.98 M ops/s (±0.43M)
+- **Compiled-in:** 53.31 M ops/s (±0.80M)
+- **Improvement:** **-0.62%** (compiled-in is faster!)
+
+**Root Cause:** Pool v2 is OFF by default (ENV-gated):
+```c
+const char* e = getenv("HAKMEM_POOL_V2_ENABLED");
+g = (e && *e && *e != '0') ? 1 : 0;  // Default: OFF
+```
+
+**Result:** Atomics are never incremented → compile-out has **zero runtime effect**.
+
+**Why anomaly (-0.62% faster with atomics ON)?**
+1. High variance (research build: 1.50% stdev vs baseline: 0.81%)
+2. Compiler optimization artifact (code layout, instruction cache alignment)
+3. Sample size (10 runs) insufficient to distinguish signal from noise
+4. **Conclusion:** Noise, not real effect
+
+**Decision:** NEUTRAL - Keep compile-out for:
+- Code cleanliness (reduces binary size)
+- Future-proofing (ready if Pool v2 is enabled)
+- Consistency with Phase 24-28 pattern
+
+**Key Lesson:** Before A/B testing, verify code is ACTIVE:
+```bash
+rg "getenv.*FEATURE" && echo "⚠️ ENV-gated, may be OFF"
+```
+
+**Updated Audit Checklist:**
+1. ✅ Classify atomics (CORRECTNESS vs TELEMETRY)
+2. ✅ Verify no flow control usage
+3. **NEW:** ✅ Verify code path is ACTIVE in benchmark ← **Phase 29 lesson**
+4. Implement compile-out
+5. A/B test
+
+**Reference:** `docs/analysis/PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md`
+
+---
+
 ## Cumulative Impact
 
 | Phase | Atomics Removed | Frequency | Impact | Status |
@@ -156,9 +212,13 @@ if ((int)qlen < g_bg_spill_target) {  // FLOW CONTROL DECISION
 | 26 | 5 (diagnostics) | Low (edge cases) | -0.33% | NEUTRAL ✅ |
 | 27 | 6 (unified cache) | Medium (refills) | **+0.74%** | GO ✅ |
 | **28** | **0 (bg spill)** | **N/A (all CORRECTNESS)** | **N/A** | **NO-OP ✅** |
+| **29** | **0 (pool v2)** | **N/A (code not active)** | **0.00%** | **NO-OP ✅** |
 | **Total** | **17 atomics** | **Mixed** | **+2.74%** | **✅** |
 
-**Key Insight:** Atomic frequency matters more than count. High-frequency atomics (Phase 24+25) provide measurable benefit (+0.93%, +1.07%). Medium-frequency atomics (Phase 27, WARM path) provide substantial benefit (+0.74%). Low-frequency atomics (Phase 26) provide cleanliness but no performance gain. **Correctness atomics are untouchable** (Phase 28).
+**Key Insights:**
+1. **Frequency matters more than count:** High-frequency atomics (Phase 24+25) provide measurable benefit (+0.93%, +1.07%). Medium-frequency atomics (Phase 27, WARM path) provide substantial benefit (+0.74%). Low-frequency atomics (Phase 26) provide cleanliness but no performance gain.
+2. **Correctness atomics are untouchable:** Phase 28 showed that lock-free queues and flow control counters must not be touched.
+3. **ENV-gated code paths need verification:** Phase 29 showed that compile-out of inactive code has zero performance impact. Always verify code is active before A/B testing.
 
 ---
 
@@ -193,19 +253,32 @@ if ((int)qlen < g_bg_spill_target) {  // FLOW CONTROL DECISION
   - **Operational counters:** Used for control flow decisions, UNTOUCHABLE
 - Example: `g_bg_spill_len` looks like telemetry but controls queue depth limits
 
+### 6. Verify Code is Active (NEW: Phase 29 Lesson)
+- **Phase 29:** Pool v2 stats were all TELEMETRY but ENV-gated (default OFF)
+- Compile-out had **zero impact** because code never ran
+- **Before A/B testing:**
+  1. Check for `getenv()` gates → may be OFF by default
+  2. Add temporary debug printf to verify code path is hit
+  3. Or use `perf record` to check if functions are called
+- **Anomaly:** Compiled-in was 0.62% faster (noise due to compiler artifacts, not real effect)
+
 ---
 
-## Next Phase Candidates (Phase 29+)
+## Next Phase Candidates (Phase 30+)
 
-### High Priority: Warm Path Atomics
+### Completed Audits
 
 1. ~~**Background Spill Queue** (Phase 28)~~ ✅ **COMPLETE (NO-OP)**
    - **Result:** All CORRECTNESS atomics, no compile-out candidates
    - **Reason:** Lock-free queue + flow control counter
 
-### Medium Priority: Warm-ish Path Atomics
+2. ~~**Pool Hotbox v2 Stats** (Phase 29)~~ ✅ **COMPLETE (NO-OP)**
+   - **Result:** All TELEMETRY atomics, but code path not active (ENV-gated)
+   - **Reason:** `HAKMEM_POOL_V2_ENABLED` defaults to OFF
 
-2. **Remote Target Queue** (Phase 29 candidate)
+### High Priority: Warm Path Atomics
+
+3. **Remote Target Queue** (Phase 30 candidate)
    - **Targets:** `g_remote_target_len[class_idx]` atomics
    - **File:** `core/hakmem_tiny_remote_target.c`
    - **Atomics:** `atomic_fetch_add/sub` on queue length
@@ -216,28 +289,20 @@ if ((int)qlen < g_bg_spill_target) {  // FLOW CONTROL DECISION
 
 ### Low Priority: Cold Path Atomics
 
-3. **SuperSlab OS Stats** (Phase 29+)
+4. **SuperSlab OS Stats** (Phase 30+)
    - **Targets:** `g_ss_os_alloc_calls`, `g_ss_os_madvise_calls`, etc.
    - **Files:** `core/box/ss_os_acquire_box.h`, `core/box/madvise_guard_box.c`
    - **Frequency:** Cold (init/mmap/madvise)
    - **Expected Gain:** <0.1%
    - **Priority:** LOW (code cleanliness only)
 
-4. **Shared Pool Diagnostics** (Phase 30+)
+5. **Shared Pool Diagnostics** (Phase 31+)
    - **Targets:** `rel_c7_*`, `dbg_c7_*` (release/acquire logs)
    - **Files:** `core/hakmem_shared_pool_acquire.c`, `core/hakmem_shared_pool_release.c`
    - **Frequency:** Cold (shared pool operations)
    - **Expected Gain:** <0.1%
    - **Priority:** LOW
 
-5. **Pool Hotbox v2 Stats** (Phase 31+)
-   - **Targets:** `g_pool_hotbox_v2_stats[ci].*` counters
-   - **File:** `core/hakmem_pool.c`
-   - **Atomics:** ~15 stats counters (alloc_calls, free_calls, etc.)
-   - **Frequency:** Medium-High (pool operations)
-   - **Expected Gain:** +0.2-0.5% (if high-frequency)
-   - **Priority:** MEDIUM
-
 ---
 
 ## Pattern Template (For Future Phases)
@@ -336,6 +401,11 @@ All atomic compile gates in `core/hakmem_build_flags.h`:
 #ifndef HAKMEM_HDR_META_FAST_COMPILED
 #  define HAKMEM_HDR_META_FAST_COMPILED 0
 #endif
+
+// Phase 29: Pool Hotbox v2 Stats (NO-OP - code not active)
+#ifndef HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+#  define HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED 0
+#endif
 ```
 
 **Default State:** All flags = 0 (compiled-out, production-ready)
@@ -345,12 +415,12 @@ All atomic compile gates in `core/hakmem_build_flags.h`:
 
 ## Conclusion
 
-**Total Progress (Phase 24+25+26+27+28):**
-- **Performance Gain:** +2.74% (Phase 24: +0.93%, Phase 25: +1.07%, Phase 26: NEUTRAL, Phase 27: +0.74%, Phase 28: NO-OP)
+**Total Progress (Phase 24+25+26+27+28+29):**
+- **Performance Gain:** +2.74% (Phase 24: +0.93%, Phase 25: +1.07%, Phase 26: NEUTRAL, Phase 27: +0.74%, Phase 28: NO-OP, Phase 29: NO-OP)
 - **Atomics Removed:** 17 telemetry atomics from hot/warm paths
-- **Phases Completed:** 5 phases (4 with changes, 1 audit-only)
+- **Phases Completed:** 6 phases (4 with changes, 2 audit-only)
 - **Code Quality:** Cleaner hot/warm paths, closer to mimalloc's zero-overhead principle
-- **Next Target:** Phase 29 (remote target queue or pool hotbox v2 stats)
+- **Next Target:** Phase 30 (remote target queue or other ACTIVE code paths)
 
 **Key Success Factors:**
 1. Systematic audit and classification (CORRECTNESS vs TELEMETRY)
@@ -365,13 +435,14 @@ All atomic compile gates in `core/hakmem_build_flags.h`:
 - Focus on high-frequency paths, audit carefully for CORRECTNESS vs TELEMETRY
 - Document all verdicts for reproducibility
 
-**Lessons from Phase 28:**
-- Not all atomic counters are telemetry
-- Flow control counters (e.g., `g_bg_spill_len`) are CORRECTNESS
+**Lessons from Phase 28+29:**
+- Not all atomic counters are telemetry (Phase 28: flow control counters are CORRECTNESS)
+- Flow control counters (e.g., `g_bg_spill_len`) are UNTOUCHABLE
 - Always trace how counter is used before classifying
+- Verify code path is ACTIVE before A/B testing (Phase 29: ENV-gated code has zero impact)
 
 ---
 
 **Last Updated:** 2025-12-16
-**Status:** Phase 24+25+26+27 Complete (+2.74%), Phase 28 Audit Complete (NO-OP)
+**Status:** Phase 24+25+26+27 Complete (+2.74%), Phase 28+29 Audit Complete (NO-OP x2)
 **Maintained By:** Claude Sonnet 4.5
diff --git a/docs/analysis/PHASE29_POOL_HOTBOX_V2_AUDIT.md b/docs/analysis/PHASE29_POOL_HOTBOX_V2_AUDIT.md
new file mode 100644
index 00000000..c1f953e6
--- /dev/null
+++ b/docs/analysis/PHASE29_POOL_HOTBOX_V2_AUDIT.md
@@ -0,0 +1,299 @@
+# Phase 29: Pool Hotbox v2 Stats Audit
+
+## Executive Summary
+
+**Date:** 2025-12-16
+**Objective:** Audit all `g_pool_hotbox_v2_stats[ci].*` atomic operations to classify as CORRECTNESS vs TELEMETRY
+**Result:** ALL 12 ATOMIC FIELDS ARE PURE TELEMETRY
+**Recommendation:** Proceed with compile-out (Step 1-3)
+
+## Critical Lesson from Phase 28
+
+Phase 28 revealed that `g_bg_spill_len` appeared to be telemetry but was actually flow control. We learned:
+- Variables named `*_len`, `*_count`, `*_fail` can be CORRECTNESS
+- Must trace **all usage sites**, not just writes
+- Any `if/while` condition usage → CORRECTNESS
+- Only `fprintf/printf` usage → TELEMETRY
+
+## Structure Definition
+
+```c
+// core/box/pool_hotbox_v2_box.h:16-29
+typedef struct PoolHotBoxV2Stats {
+    _Atomic uint64_t alloc_calls;              // Line 17
+    _Atomic uint64_t alloc_fast;               // Line 18
+    _Atomic uint64_t alloc_refill;             // Line 19
+    _Atomic uint64_t alloc_refill_fail;        // Line 20
+    _Atomic uint64_t alloc_fallback_v1;        // Line 21
+    _Atomic uint64_t free_calls;               // Line 22
+    _Atomic uint64_t free_fast;                // Line 23
+    _Atomic uint64_t free_fallback_v1;         // Line 24
+    _Atomic uint64_t page_of_fail_header_missing;  // Line 25
+    _Atomic uint64_t page_of_fail_out_of_range;    // Line 26
+    _Atomic uint64_t page_of_fail_misaligned;      // Line 27
+    _Atomic uint64_t page_of_fail_unknown;         // Line 28
+} PoolHotBoxV2Stats;
+```
+
+**Total:** 12 atomic uint64_t fields
+
+## Complete Usage Analysis
+
+### Write Operations (13 sites)
+
+All writes are `atomic_fetch_add_explicit(..., 1, memory_order_relaxed)` incrementing counters:
+
+1. **Line 903:** `alloc_calls` - write only, in `pool_hotbox_v2_record_alloc()`
+2. **Line 908:** `alloc_refill` - write only, in `pool_hotbox_v2_record_alloc_refill()`
+3. **Line 913:** `alloc_refill_fail` - write only, in `pool_hotbox_v2_record_alloc_refill_fail()`
+4. **Line 918:** `alloc_fallback_v1` - write only, in `pool_hotbox_v2_record_alloc_fallback()`
+5. **Line 923:** `free_calls` - write only, in `pool_hotbox_v2_record_free()`
+6. **Line 932:** `free_fallback_v1` - write only, in `pool_hotbox_v2_record_free_fallback()`
+7. **Line 947:** `page_of_fail_header_missing` - write only, in `pool_hotbox_v2_record_pageof_fail()`
+8. **Line 950:** `page_of_fail_out_of_range` - write only, in `pool_hotbox_v2_record_pageof_fail()`
+9. **Line 953:** `page_of_fail_misaligned` - write only, in `pool_hotbox_v2_record_pageof_fail()`
+10. **Line 957:** `page_of_fail_unknown` - write only, in `pool_hotbox_v2_record_pageof_fail()`
+11. **Line 1088:** `alloc_fast` - write only, in `pool_hotbox_v2_record_alloc_fast()`
+12. **Line 1093:** `free_fast` - write only, in `pool_hotbox_v2_record_free_fast()`
+
+### Read Operations (12 sites)
+
+All reads are `atomic_load_explicit(..., memory_order_relaxed)` in `pool_hotbox_v2_dump_stats()`:
+
+13. **Line 1295:** `alloc_calls` - load for fprintf
+14. **Line 1296:** `alloc_refill` - load for fprintf
+15. **Line 1297:** `alloc_refill_fail` - load for fprintf
+16. **Line 1298:** `alloc_fallback_v1` - load for fprintf
+17. **Line 1299:** `free_calls` - load for fprintf
+18. **Line 1300:** `free_fallback_v1` - load for fprintf
+19. **Line 1301:** `alloc_fast` - load for fprintf
+20. **Line 1302:** `free_fast` - load for fprintf
+21. **Line 1303:** `page_of_fail_header_missing` - load for fprintf
+22. **Line 1304:** `page_of_fail_out_of_range` - load for fprintf
+23. **Line 1305:** `page_of_fail_misaligned` - load for fprintf
+24. **Line 1306:** `page_of_fail_unknown` - load for fprintf
+
+### Critical Analysis: Are ANY reads used for flow control?
+
+**NO.** Examined all read sites (lines 1295-1306):
+
+```c
+// core/hakmem_pool.c:1292-1315
+__attribute__((destructor)) static void pool_hotbox_v2_dump_stats(void) {
+    if (!pool_hotbox_v2_stats_enabled()) return;
+    for (int i = 0; i < POOL_NUM_CLASSES; i++) {
+        uint64_t ac = atomic_load_explicit(&g_pool_hotbox_v2_stats[i].alloc_calls, memory_order_relaxed);
+        uint64_t ar = atomic_load_explicit(&g_pool_hotbox_v2_stats[i].alloc_refill, memory_order_relaxed);
+        // ... [10 more loads]
+
+        // ONLY usage: fprintf condition check (line 1307)
+        if (ac || afb || fc || ffb || ar || arf || af || ff || pf_hdr || pf_range || pf_mis || pf_unknown) {
+            fprintf(stderr, "[POOL_V2_STATS] cls=%d alloc_calls=%llu ...\n", ...);
+        }
+    }
+}
+```
+
+**Analysis:**
+- The `if` condition (line 1307) checks if ANY counter is non-zero
+- **Purpose:** Skip printing empty lines (telemetry optimization)
+- **NOT flow control:** Does not affect allocation/free logic
+- **Effect if removed:** Would print zeros for inactive classes (cosmetic only)
+
+## Field-by-Field Classification
+
+| # | Field Name | Write Sites | Read Sites | Flow Control? | Classification |
+|---|------------|-------------|------------|---------------|----------------|
+| 1 | `alloc_calls` | 903 | 1295 | NO | **TELEMETRY** |
+| 2 | `alloc_fast` | 1088 | 1301 | NO | **TELEMETRY** |
+| 3 | `alloc_refill` | 908 | 1296 | NO | **TELEMETRY** |
+| 4 | `alloc_refill_fail` | 913 | 1297 | NO | **TELEMETRY** |
+| 5 | `alloc_fallback_v1` | 918 | 1298 | NO | **TELEMETRY** |
+| 6 | `free_calls` | 923 | 1299 | NO | **TELEMETRY** |
+| 7 | `free_fast` | 1093 | 1302 | NO | **TELEMETRY** |
+| 8 | `free_fallback_v1` | 932 | 1300 | NO | **TELEMETRY** |
+| 9 | `page_of_fail_header_missing` | 947 | 1303 | NO | **TELEMETRY** |
+| 10 | `page_of_fail_out_of_range` | 950 | 1304 | NO | **TELEMETRY** |
+| 11 | `page_of_fail_misaligned` | 953 | 1305 | NO | **TELEMETRY** |
+| 12 | `page_of_fail_unknown` | 957 | 1306 | NO | **TELEMETRY** |
+
+## Detailed Evidence: No Flow Control Usage
+
+### Evidence 1: Write-only call sites
+
+All 12 write sites are in `pool_hotbox_v2_record_*()` helper functions:
+
+```c
+// Line 901-904: Example write pattern
+static inline void pool_hotbox_v2_record_alloc(uint32_t ci) {
+    if ((int)ci >= POOL_NUM_CLASSES) return;
+    atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_calls, 1, memory_order_relaxed);
+}
+```
+
+**No return value used.** No control flow affected.
+
+### Evidence 2: Caller sites don't check results
+
+Example callers:
+
+```c
+// Line 1207: alloc path
+pool_hotbox_v2_record_alloc(class_idx);  // void return, result ignored
+
+// Line 1246: free path
+pool_hotbox_v2_record_free(class_idx);   // void return, result ignored
+
+// Line 1103: fast alloc
+pool_hotbox_v2_record_alloc_fast(ci);    // void return, result ignored
+```
+
+**No branching based on these calls.**
+
+### Evidence 3: Only read site is destructor dump
+
+```c
+// Line 1292: __attribute__((destructor))
+static void pool_hotbox_v2_dump_stats(void) {
+    if (!pool_hotbox_v2_stats_enabled()) return;
+    // ... only loads stats for fprintf
+}
+```
+
+**Destructor runs at exit, cannot affect runtime flow control.**
+
+### Evidence 4: Contrast with Phase 28 CORRECTNESS example
+
+**Phase 28 `g_bg_spill_len` (CORRECTNESS):**
+```c
+// Used in if condition for flow control
+if (atomic_load(&g_bg_spill_len, ...) >= SPILL_THRESHOLD) {
+    // SKIP draining - flow control!
+    return;
+}
+```
+
+**Phase 29 stats (TELEMETRY):**
+```c
+// Only used in destructor fprintf
+if (ac || fc || ...) {  // cosmetic: skip empty lines
+    fprintf(stderr, "[POOL_V2_STATS] ...\n", ac, fc, ...);
+}
+```
+
+**Clear difference:** Phase 28 affected runtime behavior; Phase 29 only affects logging.
+
+## Gray Zone Analysis
+
+**Suspicious field names:**
+- `alloc_refill_fail` - Has "fail" in name (Phase 28 warning sign)
+- `page_of_fail_*` - Multiple "fail" counters
+
+**Verification:**
+
+1. **`alloc_refill_fail` (line 913):**
+   ```c
+   // Line 1218-1220: Context
+   void* base = cold.refill_page ? cold.refill_page(...) : NULL;
+   if (!base || !bs || !cap) {
+       pool_hotbox_v2_record_alloc_refill_fail(class_idx);  // AFTER decision
+       return NULL;  // Already failed
+   }
+   ```
+   **Result:** Counter incremented AFTER failure detected. Not used for detection.
+
+2. **`page_of_fail_*` (lines 947-957):**
+   ```c
+   // Line 1250-1253: Context
+   pool_page_v2* p = pool_hotbox_v2_page_of(ctx, class_idx, raw_block, &pageof_reason);
+   if (!p) {
+       pool_hotbox_v2_record_pageof_fail(class_idx, pageof_reason);  // AFTER NULL check
+       return 0;  // Already decided to fail
+   }
+   ```
+   **Result:** Counters incremented AFTER failure, not used to decide failure.
+
+**Conclusion:** Even "fail" counters are pure telemetry.
+
+## Hot Path Analysis
+
+**Where are these atomics hit?**
+
+1. **`pool_hotbox_v2_alloc()` (line 1203):**
+   - WARM path (per-allocation)
+   - Increments: `alloc_calls`, `alloc_fast`, `alloc_refill`, `alloc_refill_fail`
+
+2. **`pool_hotbox_v2_free()` (line 1244):**
+   - WARM path (per-free)
+   - Increments: `free_calls`, `free_fast`, `page_of_fail_*`
+
+3. **`pool_hotbox_v2_alloc_fast()` (lines 1096, 1121):**
+   - HOT path (TLS fast path)
+   - Increments: `alloc_fast`
+
+4. **`pool_hotbox_v2_record_free_fast()` (line 1091):**
+   - HOT path (TLS fast path)
+   - Increments: `free_fast`
+
+**Impact:** HOT path atomics (alloc_fast, free_fast) have highest tax. WARM path atomics also significant.
+
+## Comparison: Phase 27 vs Phase 29
+
+| Metric | Phase 27 (Unified Cache) | Phase 29 (Pool Hotbox v2) |
+|--------|--------------------------|---------------------------|
+| Total atomic fields | ~8 | 12 |
+| TELEMETRY fields | 8 | 12 |
+| CORRECTNESS fields | 0 | 0 |
+| Path hotness | WARM | HOT + WARM |
+| A/B result | +0.74% GO | TBD |
+
+**Expectation:** Phase 29 should have similar or higher impact due to HOT path presence.
+
+## Final Verdict
+
+**Classification:** ALL 12 fields are **TELEMETRY**
+
+**Evidence strength:** DEFINITIVE
+- No flow control usage (searched entire file)
+- No return value checks
+- Only destructor reads for fprintf
+- All writes are fire-and-forget increments
+
+**Recommendation:** Proceed to Step 1 (build flag), Step 2 (compile-out), Step 3 (A/B test)
+
+**Expected impact:** +0.2% to +0.5% (conservative estimate based on Phase 27)
+
+## Files Involved
+
+- **Stats definition:** `core/box/pool_hotbox_v2_box.h:16-29`
+- **Stats usage:** `core/hakmem_pool.c:813, 903-957, 1088-1315`
+- **Compile flag location:** `core/hakmem_build_flags.h` (to be added)
+
+## Appendix: Complete Usage Map
+
+```
+Write sites (13):
+  903: alloc_calls         (pool_hotbox_v2_record_alloc)
+  908: alloc_refill        (pool_hotbox_v2_record_alloc_refill)
+  913: alloc_refill_fail   (pool_hotbox_v2_record_alloc_refill_fail)
+  918: alloc_fallback_v1   (pool_hotbox_v2_record_alloc_fallback)
+  923: free_calls          (pool_hotbox_v2_record_free)
+  932: free_fallback_v1    (pool_hotbox_v2_record_free_fallback)
+  947: page_of_fail_header_missing (pool_hotbox_v2_record_pageof_fail)
+  950: page_of_fail_out_of_range   (pool_hotbox_v2_record_pageof_fail)
+  953: page_of_fail_misaligned     (pool_hotbox_v2_record_pageof_fail)
+  957: page_of_fail_unknown        (pool_hotbox_v2_record_pageof_fail)
+ 1088: alloc_fast          (pool_hotbox_v2_record_alloc_fast)
+ 1093: free_fast           (pool_hotbox_v2_record_free_fast)
+
+Read sites (12):
+ 1295-1306: All 12 fields loaded in pool_hotbox_v2_dump_stats() destructor
+
+Control flow sites: NONE
+```
+
+---
+
+**Audit completed:** 2025-12-16
+**Auditor:** Claude Sonnet 4.5
+**Next step:** Implement compile-out (Step 1-3)
diff --git a/docs/analysis/PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md b/docs/analysis/PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md
new file mode 100644
index 00000000..3a680a61
--- /dev/null
+++ b/docs/analysis/PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md
@@ -0,0 +1,238 @@
+# Phase 29: Pool Hotbox v2 Stats Prune - Results
+
+## Executive Summary
+
+**Date:** 2025-12-16
+**Result:** **NO-OP** (Pool Hotbox v2 not active in default configuration)
+**Verdict:** NEUTRAL - Keep compile-out for code cleanliness
+**Impact:** 0.00% (atomics never executed)
+
+## A/B Test Results
+
+### Configuration
+
+- **Baseline (COMPILED=0, default):** Atomics compiled-out (via `#if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED`)
+- **Research (COMPILED=1):** Atomics active (`atomic_fetch_add_explicit` executed)
+- **Workload:** `bench_random_mixed` (10 runs, 20M ops each)
+
+### Raw Data
+
+**Baseline (atomics OFF):**
+```
+Run  1: 52,651,025 ops/s
+Run  2: 52,251,016 ops/s
+Run  3: 52,545,864 ops/s
+Run  4: 53,765,007 ops/s
+Run  5: 53,284,121 ops/s
+Run  6: 52,982,021 ops/s
+Run  7: 53,073,218 ops/s
+Run  8: 52,844,359 ops/s
+Run  9: 53,238,262 ops/s
+Run 10: 53,150,487 ops/s
+
+Mean:   52,978,538 ops/s
+Stdev:     429,428 ops/s (0.81%)
+```
+
+**Research (atomics ON):**
+```
+Run  1: 53,282,648 ops/s
+Run  2: 53,973,577 ops/s
+Run  3: 52,681,322 ops/s
+Run  4: 54,175,703 ops/s
+Run  5: 52,841,032 ops/s
+Run  6: 53,461,187 ops/s
+Run  7: 52,268,525 ops/s
+Run  8: 53,799,964 ops/s
+Run  9: 52,147,517 ops/s
+Run 10: 54,432,544 ops/s
+
+Mean:   53,306,402 ops/s
+Stdev:     800,321 ops/s (1.50%)
+```
+
+### Statistical Analysis
+
+| Metric | Baseline (OFF) | Research (ON) | Delta |
+|--------|----------------|---------------|-------|
+| Mean | 52,978,538 ops/s | 53,306,402 ops/s | -327,864 ops/s |
+| Stdev | 429,428 (0.81%) | 800,321 (1.50%) | +370,893 (noise) |
+| **Relative Delta** | - | - | **-0.62%** |
+
+**Interpretation:** Research build (atomics ON) is 0.62% FASTER than baseline (atomics OFF).
+
+## Root Cause Analysis: Why NO-OP?
+
+### Discovery
+
+Pool Hotbox v2 is **OFF by default** and gated by environment variable:
+
+```c
+// core/hakmem_pool.c:824-831
+static int pool_hotbox_v2_global_enabled(void) {
+    static int g = -1;
+    if (__builtin_expect(g == -1, 0)) {
+        const char* e = getenv("HAKMEM_POOL_V2_ENABLED");  // ← ENV gate
+        g = (e && *e && *e != '0') ? 1 : 0;
+    }
+    return g;
+}
+```
+
+**Result:** All `pool_hotbox_v2_record_*()` calls are no-ops:
+- `pool_hotbox_v2_alloc()` is never called
+- `pool_hotbox_v2_free()` is never called
+- All 12 atomic counters are never incremented
+- Compile-out has **zero runtime effect**
+
+### Why Research Build is Faster
+
+**Hypothesis:** Compiler optimization artifact (noise)
+
+1. **High variance in research build:** 1.50% stdev vs 0.81% baseline
+   - Suggests measurement noise, not real effect
+   - Delta (-0.62%) is within 1 stdev of research build
+
+2. **Code layout changes:**
+   - Adding `#if` guards changes object file layout
+   - May affect instruction cache alignment by chance
+   - LTO/PGO sensitive to code structure
+
+3. **Sample size:** 10 runs insufficient to distinguish noise from signal
+
+**Conclusion:** The -0.62% "speedup" for atomics ON is likely **noise**, not a real effect.
+
+## Comparison: Phase 27 vs Phase 29
+
+| Phase | Target | Path | Active? | Result |
+|-------|--------|------|---------|--------|
+| 27 | Unified Cache stats | WARM | ✅ YES | +0.74% GO |
+| 29 | Pool Hotbox v2 stats | HOT+WARM | ❌ NO | 0.00% NO-OP |
+
+**Key difference:** Phase 27 stats were on ACTIVE code path; Phase 29 stats are on INACTIVE (ENV-gated) path.
+
+## Why Keep Compile-Out?
+
+Despite NO-OP result, **we maintain the compile-out** for:
+
+1. **Code cleanliness:** Reduces binary size (12 atomics × 7 classes = 84 atomic counters)
+2. **Future-proofing:** If Pool v2 is enabled later, compile-out is already in place
+3. **Consistency:** Matches Phase 24-28 atomic prune pattern
+4. **Documentation:** Makes it clear these are research-only counters
+
+## Actionable Findings
+
+### For Phase 29
+
+**Decision:** NEUTRAL - Maintain compile-out (default `COMPILED=0`)
+
+**Rationale:**
+- No performance impact (code not running)
+- No harm (compile-out is correct for inactive code)
+- Future benefit (ready if Pool v2 is enabled)
+
+### For Future Phases
+
+**Lesson:** Before A/B testing compile-out, verify code is ACTIVE:
+
+```bash
+# Check if feature is runtime-enabled
+rg "getenv.*FEATURE" && echo "⚠️ ENV-gated, may be OFF by default"
+
+# Verify code path is exercised
+# Option 1: Add temporary printf, check if it fires
+# Option 2: Use perf to check if functions are called
+```
+
+**Updated audit checklist:**
+1. ✅ Classify atomics (CORRECTNESS vs TELEMETRY)
+2. ✅ Verify no flow control usage
+3. **NEW:** ✅ Verify code path is ACTIVE in benchmark
+4. Implement compile-out
+5. A/B test
+
+## Files Modified
+
+### Phase 29 Implementation
+
+1. **Build flag:** `core/hakmem_build_flags.h:352-361`
+   ```c
+   #ifndef HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+   #  define HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED 0
+   #endif
+   ```
+
+2. **Compile-out:** `core/hakmem_pool.c:903-1129`
+   - Wrapped 13 atomic writes (lines 903, 913, 922, 931, 941, 947, 950, 953, 957, 972-983, 1117, 1126)
+   - Example:
+     ```c
+     #if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED
+         atomic_fetch_add_explicit(&g_pool_hotbox_v2_stats[ci].alloc_calls, 1, ...);
+     #else
+         (void)0;
+     #endif
+     ```
+
+3. **Include:** `core/hakmem_pool.c:48`
+   - Added `#include "hakmem_build_flags.h"`
+
+### Audit Documentation
+
+- `docs/analysis/PHASE29_POOL_HOTBOX_V2_AUDIT.md`
+  - Complete usage analysis (24 sites: 12 writes + 12 reads)
+  - TELEMETRY classification (all 12 fields)
+  - No CORRECTNESS usage found
+
+## Performance Impact
+
+**Expected:** +0.2% to +0.5% (similar to Phase 27)
+**Actual:** 0.00% (code path not active)
+
+**If Pool v2 were enabled:**
+- 12 atomic counters on HOT+WARM path
+- Estimated impact: +0.3% to +0.8% (higher than Phase 27 due to HOT path presence)
+
+## Recommendations
+
+### Immediate
+
+1. **Keep compile-out:** No downside, future upside
+2. **Update audit process:** Add "verify code is active" step
+3. **Document ENV gates:** Tag all ENV-gated features in audit
+
+### Future Work
+
+**Phase 30+ candidates:**
+- Focus on **ACTIVE** code paths only
+- Check for ENV gates before scheduling A/B tests
+- Consider enabling Pool v2 (if performance gain expected) to test this prune's true impact
+
+### Pool Hotbox v2 Activation
+
+**If enabling Pool v2 in future:**
+
+```bash
+# Enable Pool v2 globally
+export HAKMEM_POOL_V2_ENABLED=1
+
+# Enable specific classes (bitmask)
+export HAKMEM_POOL_V2_CLASSES=0x7F  # All 7 classes
+
+# Enable stats (if COMPILED=1)
+export HAKMEM_POOL_V2_STATS=1
+```
+
+**Then re-run Phase 29 A/B test to measure true impact.**
+
+## Conclusion
+
+Phase 29 successfully implements compile-out infrastructure for Pool Hotbox v2 stats, but has **zero performance impact** because Pool v2 is disabled by default in the benchmark.
+
+**Verdict:** NEUTRAL - Maintain compile-out for code cleanliness and future-proofing.
+
+**Key lesson:** Always verify code path is ACTIVE before scheduling A/B tests. ENV-gated features may appear on hot paths but never execute.
+
+---
+
+**Phase 29 Status:** COMPLETE (NO-OP, but infrastructure ready)
+**Next Phase:** Phase 30 (TBD - focus on ACTIVE code paths)
diff --git a/hakmem.d b/hakmem.d
index 829491c7..832ecf27 100644
--- a/hakmem.d
+++ b/hakmem.d
@@ -24,7 +24,8 @@ hakmem.o: core/hakmem.c core/hakmem.h core/hakmem_build_flags.h \
  core/tiny_fastcache.h core/hakmem_env_cache.h \
  core/box/tiny_next_ptr_box.h core/hakmem_tiny_config.h \
  core/tiny_nextptr.h core/tiny_region_id.h core/tiny_box_geometry.h \
- core/ptr_track.h core/tiny_debug_api.h core/box/tiny_layout_box.h \
+ core/ptr_track.h core/tiny_debug_api.h \
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
  core/box/../hakmem_tiny_config.h core/box/../hakmem_build_flags.h \
  core/box/tiny_header_box.h core/box/tiny_layout_box.h \
  core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h \
@@ -165,7 +166,6 @@ hakmem.o: core/hakmem.c core/hakmem.h core/hakmem_build_flags.h \
  core/box/../front/../box/free_cold_shape_stats_box.h \
  core/box/../front/../box/free_tiny_fast_mono_dualhot_env_box.h \
  core/box/../front/../box/free_tiny_fast_mono_legacy_direct_env_box.h \
- core/box/../front/../box/tiny_larson_fix_tls_box.h \
  core/box/tiny_alloc_gate_box.h core/box/tiny_route_box.h \
  core/box/tiny_alloc_gate_shape_env_box.h \
  core/box/tiny_front_config_box.h core/box/wrapper_env_box.h \
@@ -230,6 +230,7 @@ core/tiny_region_id.h:
 core/tiny_box_geometry.h:
 core/ptr_track.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/../hakmem_build_flags.h:
@@ -423,7 +424,6 @@ core/box/../front/../box/free_cold_shape_env_box.h:
 core/box/../front/../box/free_cold_shape_stats_box.h:
 core/box/../front/../box/free_tiny_fast_mono_dualhot_env_box.h:
 core/box/../front/../box/free_tiny_fast_mono_legacy_direct_env_box.h:
-core/box/../front/../box/tiny_larson_fix_tls_box.h:
 core/box/tiny_alloc_gate_box.h:
 core/box/tiny_route_box.h:
 core/box/tiny_alloc_gate_shape_env_box.h:
diff --git a/hakmem_pool.d b/hakmem_pool.d
index 0e752ab3..abc88437 100644
--- a/hakmem_pool.d
+++ b/hakmem_pool.d
@@ -1,7 +1,7 @@
 hakmem_pool.o: core/hakmem_pool.c core/hakmem_pool.h \
  core/box/hak_lane_classify.inc.h core/hakmem_config.h \
- core/hakmem_features.h core/hakmem_internal.h core/hakmem.h \
- core/hakmem_build_flags.h core/hakmem_sys.h core/hakmem_whale.h \
+ core/hakmem_features.h core/hakmem_build_flags.h core/hakmem_internal.h \
+ core/hakmem.h core/hakmem_sys.h core/hakmem_whale.h \
  core/box/ptr_type_box.h core/box/pool_hotbox_v2_header_box.h \
  core/hakmem_syscall.h core/box/pool_hotbox_v2_box.h core/hakmem_pool.h \
  core/box/pool_zero_mode_box.h core/box/../hakmem_env_cache.h \
@@ -30,9 +30,9 @@ core/hakmem_pool.h:
 core/box/hak_lane_classify.inc.h:
 core/hakmem_config.h:
 core/hakmem_features.h:
+core/hakmem_build_flags.h:
 core/hakmem_internal.h:
 core/hakmem.h:
-core/hakmem_build_flags.h:
 core/hakmem_sys.h:
 core/hakmem_whale.h:
 core/box/ptr_type_box.h:
diff --git a/hakmem_shared_pool.d b/hakmem_shared_pool.d
index aa5a127b..23dec66c 100644
--- a/hakmem_shared_pool.d
+++ b/hakmem_shared_pool.d
@@ -22,7 +22,8 @@ hakmem_shared_pool.o: core/hakmem_shared_pool.c \
  core/tiny_nextptr.h core/tiny_region_id.h core/tiny_box_geometry.h \
  core/ptr_track.h core/hakmem_tiny.h core/hakmem_trace.h \
  core/hakmem_tiny_mini_mag.h core/box/hak_lane_classify.inc.h \
- core/box/ptr_type_box.h core/tiny_debug_api.h core/box/tiny_layout_box.h \
+ core/box/ptr_type_box.h core/tiny_debug_api.h \
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
  core/box/../hakmem_tiny_config.h core/box/../hakmem_build_flags.h \
  core/box/tiny_header_box.h core/box/tiny_layout_box.h \
  core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h \
@@ -92,6 +93,7 @@ core/hakmem_tiny_mini_mag.h:
 core/box/hak_lane_classify.inc.h:
 core/box/ptr_type_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/../hakmem_build_flags.h:
diff --git a/hakmem_tiny_bg_spill.d b/hakmem_tiny_bg_spill.d
index d261fcdc..e436a743 100644
--- a/hakmem_tiny_bg_spill.d
+++ b/hakmem_tiny_bg_spill.d
@@ -13,10 +13,10 @@ hakmem_tiny_bg_spill.o: core/hakmem_tiny_bg_spill.c \
  core/box/ss_pt_env_box.h core/box/ss_pt_env_box.h core/hakmem_tiny.h \
  core/hakmem_trace.h core/hakmem_tiny_mini_mag.h \
  core/box/hak_lane_classify.inc.h core/box/ptr_type_box.h \
- core/tiny_debug_api.h core/box/tiny_layout_box.h \
- core/box/../hakmem_tiny_config.h core/box/tiny_header_box.h \
- core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
- core/box/tiny_header_write_once_env_box.h
+ core/tiny_debug_api.h core/box/tiny_header_hotfull_env_box.h \
+ core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
+ core/box/tiny_header_box.h core/box/tiny_layout_box.h \
+ core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h
 core/hakmem_tiny_bg_spill.h:
 core/box/tiny_next_ptr_box.h:
 core/hakmem_tiny_config.h:
@@ -49,6 +49,7 @@ core/hakmem_tiny_mini_mag.h:
 core/box/hak_lane_classify.inc.h:
 core/box/ptr_type_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/tiny_header_box.h:
diff --git a/hakmem_tiny_magazine.d b/hakmem_tiny_magazine.d
index ed74a59c..0392f05c 100644
--- a/hakmem_tiny_magazine.d
+++ b/hakmem_tiny_magazine.d
@@ -23,10 +23,11 @@ hakmem_tiny_magazine.o: core/hakmem_tiny_magazine.c \
  core/hakmem_whale.h core/box/tiny_next_ptr_box.h \
  core/hakmem_tiny_config.h core/tiny_nextptr.h core/tiny_region_id.h \
  core/tiny_box_geometry.h core/ptr_track.h core/tiny_debug_api.h \
- core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
- core/box/../hakmem_build_flags.h core/box/tiny_header_box.h \
- core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
- core/box/tiny_header_write_once_env_box.h core/box/tiny_mem_stats_box.h
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
+ core/box/../hakmem_tiny_config.h core/box/../hakmem_build_flags.h \
+ core/box/tiny_header_box.h core/box/tiny_layout_box.h \
+ core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h \
+ core/box/tiny_mem_stats_box.h
 core/hakmem_tiny_magazine.h:
 core/hakmem_tiny.h:
 core/hakmem_build_flags.h:
@@ -69,6 +70,7 @@ core/tiny_region_id.h:
 core/tiny_box_geometry.h:
 core/ptr_track.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/../hakmem_build_flags.h:
diff --git a/hakmem_tiny_sfc.d b/hakmem_tiny_sfc.d
index 6280bd42..265783b1 100644
--- a/hakmem_tiny_sfc.d
+++ b/hakmem_tiny_sfc.d
@@ -12,20 +12,21 @@ hakmem_tiny_sfc.o: core/hakmem_tiny_sfc.c core/tiny_alloc_fast_sfc.inc.h \
  core/box/../hakmem_build_flags.h core/box/super_reg_box.h \
  core/box/ss_pt_lookup_box.h core/box/ss_pt_types_box.h \
  core/box/ss_pt_env_box.h core/box/ss_pt_env_box.h core/tiny_debug_api.h \
- core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
- core/box/tiny_header_box.h core/box/tiny_layout_box.h \
- core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h \
- core/hakmem_stats_master.h core/tiny_tls.h core/box/tls_sll_box.h \
- core/box/../hakmem_internal.h core/box/../hakmem.h \
- core/box/../hakmem_build_flags.h core/box/../hakmem_config.h \
- core/box/../hakmem_features.h core/box/../hakmem_sys.h \
- core/box/../hakmem_whale.h core/box/../box/ptr_type_box.h \
- core/box/../hakmem_debug_master.h core/box/../tiny_remote.h \
- core/box/../hakmem_tiny_integrity.h core/box/../hakmem_tiny.h \
- core/box/../ptr_track.h core/box/../ptr_trace.h \
- core/box/../hakmem_trace_master.h core/box/../hakmem_stats_master.h \
- core/box/../tiny_debug_ring.h core/box/ss_addr_map_box.h \
- core/box/../superslab/superslab_inline.h core/box/tiny_ptr_bridge_box.h \
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
+ core/box/../hakmem_tiny_config.h core/box/tiny_header_box.h \
+ core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
+ core/box/tiny_header_write_once_env_box.h core/hakmem_stats_master.h \
+ core/tiny_tls.h core/box/tls_sll_box.h core/box/../hakmem_internal.h \
+ core/box/../hakmem.h core/box/../hakmem_build_flags.h \
+ core/box/../hakmem_config.h core/box/../hakmem_features.h \
+ core/box/../hakmem_sys.h core/box/../hakmem_whale.h \
+ core/box/../box/ptr_type_box.h core/box/../hakmem_debug_master.h \
+ core/box/../tiny_remote.h core/box/../hakmem_tiny_integrity.h \
+ core/box/../hakmem_tiny.h core/box/../ptr_track.h \
+ core/box/../ptr_trace.h core/box/../hakmem_trace_master.h \
+ core/box/../hakmem_stats_master.h core/box/../tiny_debug_ring.h \
+ core/box/ss_addr_map_box.h core/box/../superslab/superslab_inline.h \
+ core/box/tiny_ptr_bridge_box.h \
  core/box/../hakmem_tiny_superslab_internal.h \
  core/box/../hakmem_tiny_superslab.h core/box/../box/ss_hot_cold_box.h \
  core/box/../box/../superslab/superslab_types.h \
@@ -69,6 +70,7 @@ core/box/ss_pt_types_box.h:
 core/box/ss_pt_env_box.h:
 core/box/ss_pt_env_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/tiny_header_box.h:
diff --git a/tiny_adaptive_sizing.d b/tiny_adaptive_sizing.d
index e418b49a..b19583e8 100644
--- a/tiny_adaptive_sizing.d
+++ b/tiny_adaptive_sizing.d
@@ -13,9 +13,10 @@ tiny_adaptive_sizing.o: core/tiny_adaptive_sizing.c \
  core/box/../hakmem_build_flags.h core/box/super_reg_box.h \
  core/box/ss_pt_lookup_box.h core/box/ss_pt_types_box.h \
  core/box/ss_pt_env_box.h core/box/ss_pt_env_box.h core/tiny_debug_api.h \
- core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
- core/box/tiny_header_box.h core/box/tiny_layout_box.h \
- core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h
+ core/box/tiny_header_hotfull_env_box.h core/box/tiny_layout_box.h \
+ core/box/../hakmem_tiny_config.h core/box/tiny_header_box.h \
+ core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
+ core/box/tiny_header_write_once_env_box.h
 core/tiny_adaptive_sizing.h:
 core/hakmem_tiny.h:
 core/hakmem_build_flags.h:
@@ -48,6 +49,7 @@ core/box/ss_pt_types_box.h:
 core/box/ss_pt_env_box.h:
 core/box/ss_pt_env_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/tiny_header_box.h:
diff --git a/tiny_fastcache.d b/tiny_fastcache.d
index 10595dc7..d740cdff 100644
--- a/tiny_fastcache.d
+++ b/tiny_fastcache.d
@@ -13,10 +13,10 @@ tiny_fastcache.o: core/tiny_fastcache.c core/tiny_fastcache.h \
  core/box/ss_pt_env_box.h core/box/ss_pt_env_box.h core/hakmem_tiny.h \
  core/hakmem_trace.h core/hakmem_tiny_mini_mag.h \
  core/box/hak_lane_classify.inc.h core/box/ptr_type_box.h \
- core/tiny_debug_api.h core/box/tiny_layout_box.h \
- core/box/../hakmem_tiny_config.h core/box/tiny_header_box.h \
- core/box/tiny_layout_box.h core/box/../tiny_region_id.h \
- core/box/tiny_header_write_once_env_box.h
+ core/tiny_debug_api.h core/box/tiny_header_hotfull_env_box.h \
+ core/box/tiny_layout_box.h core/box/../hakmem_tiny_config.h \
+ core/box/tiny_header_box.h core/box/tiny_layout_box.h \
+ core/box/../tiny_region_id.h core/box/tiny_header_write_once_env_box.h
 core/tiny_fastcache.h:
 core/hakmem_env_cache.h:
 core/box/tiny_next_ptr_box.h:
@@ -50,6 +50,7 @@ core/hakmem_tiny_mini_mag.h:
 core/box/hak_lane_classify.inc.h:
 core/box/ptr_type_box.h:
 core/tiny_debug_api.h:
+core/box/tiny_header_hotfull_env_box.h:
 core/box/tiny_layout_box.h:
 core/box/../hakmem_tiny_config.h:
 core/box/tiny_header_box.h: