diag(ui/wave): 枚举扫描诊断留痕第二组（临时构建，随根因修复收敛）

第一组埋点烧后开回放页串口零留痕（既无 FR 失败也无零条目
行），剩余唯一静默分支 = try 闸取锁失败直接返回/扫描成功但有条目
不打印/段头与窗口读取失败不打印。本组补齐：

- scan：每次尝试编号 #N；try 闸失败行带 vol_lock_get_stats 计数（消费方
  观测，不取锁，符合看门狗设计说明 §4.3 口径）；完成行改为无条件打印
  cnt/np/tt/ac（排除「成功但页面仍空」歧义）
- load_head / seg_win：try 闸、路径构造、开档 FR 码与读失败出口全部留痕

临时诊断构建，判性后随根因修复收敛到最小永久集。
/keil-build 0 错误 0 警告（Code +604 B，RAM 不变）。

Refs #38

scripts/ram_baseline.tsv

@@ -14,4 +14,4 @@ date	code	ro	rw	zi	er_irom1	er_pct	iram1	iram1_pct	ccm	ccm_pct	top_rwzi
 2026-10-29	238936	29140	1932	141396	268076	25.6	85904	65.5	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;sb_link.o=4364;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055
 2026-10-29	243552	28784	1972	145388	272336	26.0	89936	68.6	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;wave_ring.o=5296;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055
 2026-10-30	246720	29836	2052	149708	276556	26.4	94336	72.0	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
-2026-11-02	247048	29836	2052	149708	276884	26.4	94336	72.0	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
+2026-11-02	247652	30116	2052	149708	277768	26.5	94336	72.0	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132

scripts/size_attestation.json

@@ -1,17 +1,17 @@
 {
-  "built_at": "2026-11-02T16:13:12+08:00",
-  "fingerprint": "66b6a154966ac9ce651c778bf07c79ae02f469e1cebf1f7e3f8d21a4eaf24500",
+  "built_at": "2026-11-02T17:39:58+08:00",
+  "fingerprint": "0dc67e164f92d0074da5390bdd440eef99027e2dd181311a52bd92e6453a44cc",
   "fingerprint_files": 1466,
   "fingerprint_source": "git-index",
   "gated_regions": [
     "RW_IRAM1",
     "RW_CCM"
   ],
-  "git_head": "cf8b9ccc74372378cb39e232266d3708b344db1f",
+  "git_head": "1b074bc41a9c3b4c8f0f382cb58862ce9d15b0fe",
   "map": "MDK-ARM/STM32F407-Demo/STM32F407-Demo.map",
-  "map_mtime": 1793604778,
+  "map_mtime": 1793612338,
   "pct": {
-    "ER_IROM1": 26.41,
+    "ER_IROM1": 26.49,
     "RW_CCM": 87.89,
     "RW_IRAM1": 71.97,
     "UNINIT_CCM": 18.75
@@ -19,7 +19,7 @@
   "regions": {
     "ER_IROM1": {
       "max": 1048576,
-      "size": 276884
+      "size": 277768
     },
     "RW_CCM": {
       "max": 65280,
@@ -37,8 +37,8 @@
   "schema": 2,
   "scope_note": "\u540c\u7801\u51ed\u8bc1\uff1a\u6307\u7eb9\u8986\u76d6\u56fa\u4ef6\u4f53\u79ef\u76f8\u5173\u6e90\u7801\uff0c\u53e3\u5f84\u89c1\u672c\u811a\u672c docstring",
   "sizes": {
-    "code": 247048,
-    "ro_data": 29836,
+    "code": 247652,
+    "ro_data": 30116,
     "rw_data": 2052,
     "zi_data": 149708
   },