Docs: Update ENV variable documentation after Ultra HEAP deletion

Updated documentation to reflect commit 6b791b97d deletions:

Removed ENV variables (6):
- HAKMEM_TINY_ULTRA_FRONT
- HAKMEM_TINY_ULTRA_L0
- HAKMEM_TINY_ULTRA_HEAP_DUMP
- HAKMEM_TINY_ULTRA_PAGE_DUMP
- HAKMEM_TINY_BG_REMOTE (no getenv, dead code)
- HAKMEM_TINY_BG_REMOTE_BATCH (no getenv, dead code)

Files updated (5):
- docs/analysis/ENV_CLEANUP_ANALYSIS.md: Updated BG/Ultra counts
- docs/analysis/ENV_QUICK_REFERENCE.md: Updated verification sections
- docs/analysis/ENV_CLEANUP_PLAN.md: Added REMOVED category
- docs/archive/TINY_LEARNING_LAYER.md: Added archive notice
- docs/archive/MAINLINE_INTEGRATION.md: Added archive notice

Changes: +71/-32 lines

Preserved ENV variables:
- HAKMEM_TINY_ULTRA_SLIM (active 4-layer fast path)
- HAKMEM_ULTRA_SLIM_STATS (Ultra SLIM statistics)

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

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

docs/analysis/ENV_CLEANUP_ANALYSIS.md

@@ -20,7 +20,7 @@ Generated: 2025年 11月 26日 水曜日 16:58:53 JST
 
 These variables control removed/deprecated features and should be deleted:
 
-### 1.1 Background Processing (BG) - 11 vars
+### 1.1 Background Processing (BG) - 9 vars
 **Status**: BG system removed in 2025-12 cleanup
 ```
 HAKMEM_BATCH_BG
@@ -28,6 +28,12 @@ HAKMEM_L25_BG_DRAIN
 HAKMEM_L25_BG_MS
 ```
 
+**Note**: The following 2 Tiny BG vars were removed in commit 6b791b97d (2025-11-26):
+```
+HAKMEM_TINY_BG_REMOTE          (deleted)
+HAKMEM_TINY_BG_REMOTE_BATCH    (deleted)
+```
+
 ### 1.2 SFC (Shared Frontend Cache) - 7 vars
 **Status**: SFC removed, replaced by UNIFIED_CACHE
 ```
@@ -40,21 +46,23 @@ HAKMEM_SFC_STATS_DUMP
 HAKMEM_TINY_SFC_CASCADE
 ```
 
-### 1.3 HotMag/UltraHot/Quick - 10 vars
+### 1.3 HotMag/UltraHot/Quick - 4 vars
 **Status**: Experimental caches removed
 ```
-HAKMEM_TINY_FRONT_ENABLE_ULTRAHOT
 HAKMEM_TINY_QUICK
 HAKMEM_TINY_ULTRA
-HAKMEM_TINY_ULTRA_DEBUG
-HAKMEM_TINY_ULTRA_FRONT
-HAKMEM_TINY_ULTRA_HEAP_DUMP
-HAKMEM_TINY_ULTRA_L0
-HAKMEM_TINY_ULTRA_PAGE_DUMP
-HAKMEM_TINY_ULTRA_SIMPLE
-HAKMEM_TINY_ULTRA_SLIM
 HAKMEM_TINY_ULTRA_VALIDATE
-HAKMEM_ULTRA_SLIM_STATS
+HAKMEM_TINY_ULTRA_SLIM
+```
+
+**Note**: The following 6 vars were removed in commit 6b791b97d (2025-11-26):
+```
+HAKMEM_TINY_ULTRA_FRONT        (deleted)
+HAKMEM_TINY_ULTRA_L0           (deleted)
+HAKMEM_TINY_ULTRA_HEAP_DUMP    (deleted)
+HAKMEM_TINY_ULTRA_PAGE_DUMP    (deleted)
+HAKMEM_TINY_BG_REMOTE          (deleted)
+HAKMEM_TINY_BG_REMOTE_BATCH    (deleted)
 ```
 
 ### 1.4 Ring Cache - 4 vars
@@ -380,20 +388,16 @@ HAKMEM_SFC_STATS_DUMP
 HAKMEM_TINY_SFC_CASCADE
 ```
 
-**Experimental Caches** (10 vars):
+**Experimental Caches** (4 vars):
 ```
-HAKMEM_TINY_FRONT_ENABLE_ULTRAHOT
 HAKMEM_TINY_QUICK
 HAKMEM_TINY_ULTRA
-HAKMEM_TINY_ULTRA_DEBUG
+HAKMEM_TINY_ULTRA_VALIDATE
-HAKMEM_TINY_ULTRA_FRONT
-HAKMEM_TINY_ULTRA_HEAP_DUMP
-HAKMEM_TINY_ULTRA_L0
-HAKMEM_TINY_ULTRA_PAGE_DUMP
-HAKMEM_TINY_ULTRA_SIMPLE
 HAKMEM_TINY_ULTRA_SLIM
 ```
 
+**Note**: 6 Ultra/BG vars removed in commit 6b791b97d (see section 1.3 above)
+
 **Ring/TC/Frontend** (18 vars):
 ```
 HAKMEM_L25_RING_TRIGGER

docs/analysis/ENV_CLEANUP_PLAN.md

@@ -14,9 +14,16 @@
 4. **Verification guardrails**: keep Ultra/BG/HeapV2 toggles intact; any deprecation must be #ifdef/A-B gated with a rollback env.
 
 ## Feature Decisions (keep vs. change)
-- **KEEP (active)**: Ultra (`core/ultra/*`, `core/box/ultra_slim_alloc_box.h`), BG (`core/hakmem_batch.c`, `core/hakmem_l25_pool.c`), HeapV2/FrontV2 (`core/front/tiny_heap_v2.h`, `core/tiny_alloc_fast.inc.h`), SFC (`core/hakmem_tiny_sfc.c`), TC/Ring (`core/hakmem_l25_pool.c`, `core/box/pool_init_api.inc.h`).
+- **KEEP (active)**: Ultra (`core/box/ultra_slim_alloc_box.h`), BG (`core/hakmem_batch.c`, `core/hakmem_l25_pool.c`), HeapV2/FrontV2 (`core/front/tiny_heap_v2.h`, `core/tiny_alloc_fast.inc.h`), SFC (`core/hakmem_tiny_sfc.c`), TC/Ring (`core/hakmem_l25_pool.c`, `core/box/pool_init_api.inc.h`).
 - **CLEAN**: Duplicate `HAKMEM_SFC_DEBUG` getenvs; legacy doc-only set (21 vars) from specs/papers.
-- **DEFER**: Any removal of Ultra/HeapV2/BG toggles until explicit user approval; these are part of the active Box stack.
+- **REMOVED (commit 6b791b97d, 2025-11-26)**: 6 Ultra/BG ENV vars:
+  - `HAKMEM_TINY_ULTRA_FRONT`
+  - `HAKMEM_TINY_ULTRA_L0`
+  - `HAKMEM_TINY_ULTRA_HEAP_DUMP`
+  - `HAKMEM_TINY_ULTRA_PAGE_DUMP`
+  - `HAKMEM_TINY_BG_REMOTE`
+  - `HAKMEM_TINY_BG_REMOTE_BATCH`
+- **DEFER**: Any removal of remaining Ultra/HeapV2/BG toggles until explicit user approval; these are part of the active Box stack.
 
 ## File-by-File Checkpoints (actionable)
 - **SFC (Shared Frontend Cache)**
@@ -31,7 +38,8 @@
   - `core/tiny_alloc_fast.inc.h:167,352` and `core/hakmem_tiny.c:578` — stats/enable toggles; keep.
   - `core/box/front_metrics_box.*` — metrics/dump toggles; keep.
 - **Ultra**
-  - `core/front/tiny_ultrafront.h:39`, `core/ultra/tiny_ultra_heap.c:23,180`, `core/ultra/tiny_ultra_page_arena.c:71`, `core/box/ultra_slim_alloc_box.h:87,226`, `core/box/hak_core_init.inc.h:279` — keep experimental toggles; require #ifdef rollback if changed.
+  - `core/box/ultra_slim_alloc_box.h:87,226`, `core/box/hak_core_init.inc.h:279` — keep experimental toggles; require #ifdef rollback if changed.
+  - **Removed in commit 6b791b97d**: `HAKMEM_TINY_ULTRA_FRONT`, `HAKMEM_TINY_ULTRA_L0`, `HAKMEM_TINY_ULTRA_HEAP_DUMP`, `HAKMEM_TINY_ULTRA_PAGE_DUMP` (files deleted: `core/front/tiny_ultrafront.h`, `core/ultra/tiny_ultra_heap.c`, `core/ultra/tiny_ultra_page_arena.c`).
 - **Ring/TC**
   - `core/hakmem_l25_pool.c:718,724,745`, `core/box/pool_init_api.inc.h:60,66` — ring controls (active).
   - `core/hakmem_l25_pool.c:737,739`, `core/box/pool_init_api.inc.h:72-78` — TC controls (active); no removal.

docs/analysis/ENV_QUICK_REFERENCE.md

@@ -67,18 +67,22 @@ File: core/box/hak_wrappers.inc.h:89
 
 ### Ask Maintainer/User:
 
-#### 1. Ultra Features (8 vars) - Experimental or Dead?
+#### 1. Ultra Features (3 vars) - Experimental or Dead?
 ```
-HAKMEM_TINY_ULTRA_FRONT          core/front/tiny_ultrafront.h
-HAKMEM_TINY_ULTRA_L0             core/ultra/tiny_ultra_heap.c
-HAKMEM_TINY_ULTRA_HEAP_DUMP      core/ultra/tiny_ultra_heap.c  
-HAKMEM_TINY_ULTRA_PAGE_DUMP      core/ultra/tiny_ultra_page_arena.c
 HAKMEM_TINY_ULTRA_SLIM           core/box/ultra_slim_alloc_box.h
 HAKMEM_ULTRA_SLIM_STATS          core/box/ultra_slim_alloc_box.h
 HAKMEM_TINY_ULTRA_DEBUG          core/box/hak_core_init.inc.h
 ```
 **Question**: Are Ultra features still being developed/used?
 
+**Note**: The following 4 vars were removed in commit 6b791b97d (2025-11-26):
+```
+HAKMEM_TINY_ULTRA_FRONT          (deleted)
+HAKMEM_TINY_ULTRA_L0             (deleted)
+HAKMEM_TINY_ULTRA_HEAP_DUMP      (deleted)
+HAKMEM_TINY_ULTRA_PAGE_DUMP      (deleted)
+```
+
 #### 2. Heap V2 (7 vars) - Active or Replaced?
 ```
 HAKMEM_TINY_HEAP_V2_CLASS_MASK   core/front/tiny_heap_v2.h
@@ -91,16 +95,20 @@ HAKMEM_TINY_FRONT_DISABLE_HEAPV2 core/box/front_metrics_box.h
 ```
 **Question**: Is Heap V2 frontend still used or replaced by newer code?
 
-#### 3. BG System (5 vars) - Keep or Deprecate?
+#### 3. BG System (3 vars) - Keep or Deprecate?
 ```
 HAKMEM_BATCH_BG                  core/hakmem_batch.c (g_bg_enabled=1)
 HAKMEM_L25_BG_DRAIN              core/hakmem_l25_pool.c
 HAKMEM_L25_BG_MS                 core/hakmem_l25_pool.c
-HAKMEM_TINY_BG_REMOTE            core/hakmem_tiny_remote_target.c
-HAKMEM_TINY_BG_REMOTE_BATCH      core/hakmem_tiny_remote_target.c
 ```
 **Question**: Is background drain still needed or deprecated?
 
+**Note**: The following 2 Tiny BG vars were removed in commit 6b791b97d (2025-11-26):
+```
+HAKMEM_TINY_BG_REMOTE            (deleted)
+HAKMEM_TINY_BG_REMOTE_BATCH      (deleted)
+```
+
 #### 4. HotMag/SmallMag (1 var) - Used?
 ```
 HAKMEM_TINY_SMALL_MAG            core/hakmem_tiny_smallmag.inc.h

docs/archive/MAINLINE_INTEGRATION.md

@@ -1,5 +1,12 @@
 Mainline Integration Plan (Tiny focus)
 
+> **⚠️ ARCHIVE NOTICE (2025-11-26)**
+> Several ENV variables and files referenced in this document were removed in commit 6b791b97d:
+> - `HAKMEM_TINY_BG_REMOTE` (deleted)
+> - `HAKMEM_TINY_BG_REMOTE_BATCH` (deleted)
+>
+> This document is kept for historical reference but may contain outdated information.
+
 What we promoted to mainline (safe, general)
 - Safer tiny refill into SLL (already integrated)
   - `sll_refill_small_from_ss(class_idx, max_take)` now caps refill by the actual SLL free capacity, avoiding overtake and wasted meta->used increments.

docs/archive/TINY_LEARNING_LAYER.md

@@ -1,7 +1,19 @@
 # Tiny Learning Layer & Backend Integration (Phase 27 Snapshot)
 
-**Date**: 2025-11-21  
+> **⚠️ ARCHIVE NOTICE (2025-11-26)**
-**Scope**: Tiny (0–1KB) / Shared Superslab Pool / FrozenPolicy / Ultra* Boxes  
+> Several ENV variables and files referenced in this document were removed in commit 6b791b97d:
+> - `HAKMEM_TINY_ULTRA_FRONT` (deleted)
+> - `HAKMEM_TINY_ULTRA_L0` (deleted)
+> - `HAKMEM_TINY_ULTRA_HEAP_DUMP` (deleted)
+> - `HAKMEM_TINY_ULTRA_PAGE_DUMP` (deleted)
+> - `HAKMEM_TINY_BG_REMOTE` (deleted)
+> - `HAKMEM_TINY_BG_REMOTE_BATCH` (deleted)
+> - Files deleted: `core/front/tiny_ultrafront.h`, `core/ultra/tiny_ultra_heap.c`, `core/ultra/tiny_ultra_page_arena.c`
+>
+> This document is kept for historical reference but may contain outdated information.
+
+**Date**: 2025-11-21
+**Scope**: Tiny (0–1KB) / Shared Superslab Pool / FrozenPolicy / Ultra* Boxes
 **Goal**: 学習層（FrozenPolicy / Learner）を活かして、Tiny の backend を「自動でそれなりに最適」な状態に保つための箱と境界を整理する。
 
 ---