chore(backlog): 记录 g184 完成

.ua/backlog.json

@@ -2064,8 +2064,8 @@
       "title": "层级令牌落地：z-index 字面值归零",
       "motivation": "--ua-z-dropdown/sticky/overlay/modal/toast 五档已定义但无人使用，实际仍是各组件写 100/1000/9999，弹层互相盖住的问题只能靠试数值解决。",
       "acceptance": "visual-rules 增加 z-literal 类；迁移脚本把 ui.css 中全部 z-index 字面值替换为 var(--ua-z-*)；该类计数为 0 并写入新基线；ua tokens 能看到五档层级；npm run check 全绿。",
-      "status": "open",
-      "notes": "",
+      "status": "done",
+      "notes": "z-literal 第十类规则（组件内 z:1/2 微排序豁免，同 1px 边框惯例）；按选择器把 20 处全局浮层字面值归入五档：下拉/气泡类 20/30/40→dropdown，fab→dropdown，toast/notice 宿主→toast，affix/backtop→sticky，tour/模态抽屉遮罩→overlay，image 遮罩→modal；迁移脚本对下拉类 20/30/40 提供幂等自动迁移；计数归零并写新基线 40 处",
       "domain": "visual"
     },
     {

.ua/iterations.log

@@ -229,3 +229,4 @@
 {"ts":"2026-10-26T17:30:00+08:00","id":"g181","result":"done","commit":"85f009d","summary":"控件高度统一 control-h 三档：四组件新增 size 入参，control-h-literal 门禁计数 0，demo 三档并排"}
 {"ts":"2026-10-26T17:33:15+08:00","id":"g182","result":"done","commit":"9ee04d7","summary":"暗色焦点环两令牌补覆盖 + verify 暗色齐全扩展到 shadow/focus 前缀（负向已拦）+ ua tokens 暗色列可见"}
 {"ts": "2026-10-26T17:36:54+08:00", "id": "g183", "result": "done", "commit": "fe79725", "summary": "字重行高令牌化：weight/leading 两类规则，72 处字面值全部归零，补 bold/none 档，三档归属注释就位"}
+{"ts":"2026-10-26T17:40:37+08:00","id":"g184","result":"done","commit":"2d81907","summary":"z-index 归零：20 处浮层字面值按五档令牌归位（z-literal 规则 + 幂等迁移），新基线 40 处"}