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

tools_diff_replies.py

@@ -0,0 +1,58 @@
+"""Reply-level diff between two realistic_v2 eval runs, per category."""
+import json
+import sys
+from collections import defaultdict
+from pathlib import Path
+
+
+def load(path):
+    data = json.loads(Path(path).read_text(encoding="utf-8"))
+    key = next(iter(data))
+    body = data[key]
+    rows = body if isinstance(body, list) else body.get("rows", [])
+    return rows
+
+
+def idx_keys(rows):
+    idx = defaultdict(int)
+    out = []
+    for r in rows:
+        c = r["category"]
+        out.append((c, r["query"], idx[c]))
+        idx[c] += 1
+    return out
+
+
+def main(a, b):
+    ra, rb = load(a), load(b)
+    ka, kb = idx_keys(ra), idx_keys(rb)
+    ma = {k: r for k, r in zip(ka, ra)}
+    mb = {k: r for k, r in zip(kb, rb)}
+    same_reply = defaultdict(int)
+    diff_reply = defaultdict(int)
+    diff_examples = defaultdict(list)
+    for k in ma:
+        if k not in mb:
+            continue
+        if ma[k].get("reply") == mb[k].get("reply"):
+            same_reply[k[0]] += 1
+        else:
+            diff_reply[k[0]] += 1
+            if len(diff_examples[k[0]]) < 3:
+                diff_examples[k[0]].append((k[1], ma[k].get("reply"), mb[k].get("reply")))
+    cats = sorted(set(same_reply) | set(diff_reply))
+    print(f"{'category':<20}{'same':>6}{'changed':>9}{'total':>7}")
+    for c in cats:
+        print(f"{c:<20}{same_reply[c]:>6}{diff_reply[c]:>9}{same_reply[c]+diff_reply[c]:>7}")
+    print()
+    for c in cats:
+        if diff_reply[c]:
+            print(f"=== {c}: {diff_reply[c]} replies changed ===")
+            for q, x, y in diff_examples[c]:
+                print(f"  Q: {q}")
+                print(f"   old: {x!r}")
+                print(f"   new: {y!r}")
+
+
+if __name__ == "__main__":
+    main(sys.argv[1], sys.argv[2])