Record the hum_guard verification result

Capture the latest sweep evidence so the next session can resume cleanly.

Constraint: docs only; keep large data and checkpoints out of git
Rejected: leaving hum_guard unrecorded | would lose the newest verification evidence
Confidence: high
Scope-risk: narrow
Directive: continue the next search from hum_focus
Tested: reviewed the eval.json evidence and diff
Not-tested: no code or model changes in this commit

+## 2026-06-02 16:11 UTC / hum_guard fresh eval did not beat hum_focus
+
+- 对 `/tmp/dualaxis_sweep/hum_guard/eval.json` 做了最新复核
+- fresh evidence：
+  - `num_queries=20`
+  - `top1=0.6`
+  - `topk=0.85`
+  - `clean top1=0.875`
+  - `augmented top1=0.75`
+  - `humming_like top1=0.5`
+  - `confused top1=0.0`
+- 对比结论：
+  - `hum_guard` 没有超过 `hum_focus`
+  - 它在 `topk` 上与 `hum_focus` 持平，但 `top1` 更低
+  - 当前仍应以 `hum_focus` 作为下一轮小步搜索锚点
+
 ## 2026-06-02 16:12 UTC / delivery package frozen for handoff
 
 - 当前任务切到“先交付、后续跑”的状态，暂停继续扩展实现，先把交接文件补齐

@@ -26,6 +26,25 @@
 - `hum_focus` 是目前最值得继续迭代的 dual-axis 起点。
 - 下一阶段建议是以 `hum_focus` 为锚点做小步搜索，优先保住 `humming_like` 优势。
 
+## 本次交付包追加更新（2026-06-02 16:11 UTC）
+
+### 交付结论
+
+最新的 `hum_guard` 复核结果已经确认：
+- 它没有超过 `hum_focus`
+- `topk` 持平，但 `top1` 更低
+- 所以下一轮仍应围绕 `hum_focus` 微调
+
+### fresh evidence
+
+- `num_queries=20`
+- `top1=0.6`
+- `topk=0.85`
+- `humming_like top1=0.5`
+- `confused top1=0.0`
+
+---
+
 ## 本次交付包追加更新（2026-06-02 16:12 UTC）
 
 ### 交付结论

@@ -9,6 +9,7 @@
 
 - 当前状态：先交付，后续重启继续
 - 当前最佳候选：`hum_focus`
+- 最新复核：`hum_guard` 未超过 `hum_focus`
 - 当前可继承的文档：
   - `docs/CHANGELOG.md`
   - `docs/changelist-2026-06-02.md`