chore(size): A5 合入后重盖体积同码凭证

合并 task/A5-size-gate 后主干指纹前进（凭证停留在分支基线），
按门禁指引 @build 0/0 后 ram_baseline.py --update 重盖：
Code=214,104 / RO=20,388 / RW=1,204 / ZI=131,852（A5 零体积增量，
数字与 d9ab955 台账行一致）。

scripts/size_attestation.json

@@ -1,17 +1,17 @@
 {
-  "built_at": "2026-10-25T03:35:00+08:00",
-  "fingerprint": "5f694d421c6014f421f21f72026df7606acf5d8d79ebe25c9e0d016933e776f7",
+  "built_at": "2026-10-25T03:58:34+08:00",
+  "fingerprint": "b18aee6e56c7388f103939646190742b22bb6573f6667202e4ae9f8213485579",
   "fingerprint_files": 1388,
   "fingerprint_missing": 0,
   "gated_regions": [
     "RW_IRAM1",
     "RW_CCM"
   ],
-  "git_head": "658fbe7a72c51c9a8427a39b0f9ef366726f5ffc",
+  "git_head": "ba9450c50b932bd2085809fb3c1acc8d72bafbb9",
   "map": "MDK-ARM/STM32F407-Demo/STM32F407-Demo.map",
-  "map_mtime": 1792870244,
+  "map_mtime": 1792870197,
   "pct": {
-    "ER_IROM1": 22.19,
+    "ER_IROM1": 22.36,
     "RW_CCM": 87.89,
     "RW_IRAM1": 57.7,
     "UNINIT_CCM": 18.75
@@ -19,7 +19,7 @@
   "regions": {
     "ER_IROM1": {
       "max": 1048576,
-      "size": 232640
+      "size": 234492
     },
     "RW_CCM": {
       "max": 65280,
@@ -37,8 +37,8 @@
   "schema": 1,
   "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": 213780,
-    "ro_data": 18860,
+    "code": 214104,
+    "ro_data": 20388,
     "rw_data": 1204,
     "zi_data": 131852
   },