docs(tasks): brief why the staging gate has been red since 09-22

Staging has not deployed since 1bc6a954. Rerunning the shared frontend
failures under Node 22 splits them in two. Three are real, and each passes on
its parent commit and fails from the commit that introduced it: 45ec4617 adds
a 375px breakpoint outside the allowlist, and 2a3013f2 adds two focus() calls
without preventScroll inside the chat panel and changes inputDisabled without
updating the composer's source contract. The rest fail here only because this
machine has no Docker or rsync; the gate has both, so the executor must read
the gate log rather than infer from local runs.

Privacy scan on this tree before push: zero findings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

docs/tasks/README.md

@@ -215,6 +215,7 @@
 
 | 任务书 | 进度 | 主题 | 状态 | 落点 |
 | --- | --- | --- | --- | --- |
+| `TASK-staging-gate-red-20260923.md` | — | **staging 门禁自 09-22 起持续红、两天无新部署（BUG-1012～1014）**：Node 22 逐条复现并二分到提交：`45ec4617` 新增 375px 断点不在白名单；`2a3013f2`（BUG-1000 人物选择器）两处 `focus()` 未带 `preventScroll`、`inputDisabled` 多了 `subjectDeleted` 而源码合同未跟上（行为正确、合同滞后）。决策：375 并入既有空 480 块、不扩白名单；focus 带 preventScroll；合同加三栏并改守「不含 isLoading」。其余本机失败为缺 Docker / rsync，须读门禁日志确认。与 BUG-1011 单文件不重叠可并行 | **待领取** | — |
 | `TASK-repo-hygiene-20260903.md` | `PROGRESS-repo-hygiene-20260903.md` | 岁差默认 Raman + 用户设置可选、参考集锁口径、发布门本地可复现、注册表白名单、仓库地址、早期日志搬家、远端分支清理 | 已验收（带修复单） | `b6a70aa7`、`2415e751`、`01a45363`（BUG-511）；验收结论见修复单附录 |
 | `TASK-repo-hygiene-fix-20260903.md` | `PROGRESS-repo-hygiene-fix-20260903.md` | Gulika 全局岁差泄漏（P1）、设置类名无样式、提示语对齐校正现状、剩余 lahiri 字面量、测试不写仓库 | 已验收 | `027e4b08`、`c1e3f32a`（BUG-512/513）；Gulika 泄漏实验已复核为不泄漏，全量 pytest 后仓库干净 |