Natural Memory NM2.1: 记忆路由器分叉、数据集缺陷修复与全轴评测证据

- 引入 MemoryRouterXL 与 v5/v6 流式多线程训练/编码管线
- 修复 prepare_memory_router_dataset 候选池重建缺陷（mega 家族 3568x 加速，输出逐字节相同）
- 修复 v5 被破坏的拒答与多跳标签（train 未知样本 319 -> 16319，multi_hop 平均正例 1.00 -> 2.00）
- 同存储预算下 V2-128 v6 逐轴 22/22 通过：Top-1 41.12% -> 94.62%，未知拒答 0.00% -> 100.00%
- 记录三条被实测推翻的显然优化（logits_to_keep=1 反而慢 55%、XL 容量未带来收益）
- 记忆手术跨架构可移植性 14/14，读写关闭时与原生模型逐位相同

nm2_battery_comparison_combo.json

@@ -0,0 +1,59 @@
+{
+  "原版NM2": {
+    "A_cases": 110,
+    "A_overall": 89.0909090909091,
+    "A_answerable": 100.0,
+    "A_unknown_refusal": 60.0,
+    "A_known_false_refusal": 0.0,
+    "B_accuracy": 43.75,
+    "B_wrong_attribute": 18.75,
+    "B_read": 56.25,
+    "B_records": 3.0625,
+    "C_answerable": 65.0,
+    "C_wrong_attribute": 35.0,
+    "C_unknown_leak": 75.0,
+    "C_active_min": 23,
+    "C_active_max": 24,
+    "D_recalled": true,
+    "D_answer_correct": true,
+    "D_cleanup": true
+  },
+  "NM2.1": {
+    "A_cases": 110,
+    "A_overall": 88.18181818181819,
+    "A_answerable": 100.0,
+    "A_unknown_refusal": 56.666666666666664,
+    "A_known_false_refusal": 0.0,
+    "B_accuracy": 68.75,
+    "B_wrong_attribute": 18.75,
+    "B_read": 93.75,
+    "B_records": 6.0625,
+    "C_answerable": 65.0,
+    "C_wrong_attribute": 35.0,
+    "C_unknown_leak": 75.0,
+    "C_active_min": 23,
+    "C_active_max": 24,
+    "D_recalled": true,
+    "D_answer_correct": true,
+    "D_cleanup": true
+  },
+  "NM2.1合体": {
+    "A_cases": 110,
+    "A_overall": 88.18181818181819,
+    "A_answerable": 100.0,
+    "A_unknown_refusal": 56.666666666666664,
+    "A_known_false_refusal": 0.0,
+    "B_accuracy": 68.75,
+    "B_wrong_attribute": 18.75,
+    "B_read": 93.75,
+    "B_records": 6.0625,
+    "C_answerable": 65.0,
+    "C_wrong_attribute": 35.0,
+    "C_unknown_leak": 75.0,
+    "C_active_min": 23,
+    "C_active_max": 24,
+    "D_recalled": true,
+    "D_answer_correct": true,
+    "D_cleanup": true
+  }
+}