chore: retire PowerShell update.ps1 and install_local.ps1

Superseded by src/launcher.py (Launcher.exe) + the portable layout from
build.ps1. The PS prototype validated the flow; removed to avoid confusion
with the old %LOCALAPPDATA% installer. docs/10 §16 and tasks 17.19 updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tasks.md

@@ -935,7 +935,7 @@
 - [x] `get_data_dir()` 三级回退：`CMBOT_DATA_DIR` → 打包态 `~/.cmbot` → 开发态项目根；`tests/test_file_service.py` 5 个单测
 - [x] `src/launcher.py`：复用 `update_service`，下载 zip→SHA-256→解压→`app/app.old` 切换→启动；安装根可写性检测；首次把 `app\config\` 默认模板播种到 `~/.cmbot`；`update_service` 扩展（`UpdateInfo.sha256/size/min_supported`、绝对 url 解析、`make_auth_header`/`download`）；`tests/test_launcher.py` 11 个单测 + 本地 HTTP server 真实端到端验证
 - [x] `build.ps1` 增产 `Launcher.exe`（PyInstaller onefile，console）；发布目录改为便携布局 `Launcher.exe` + `app\`；产出两个 zip——自更新载荷 `CMBot-<ver>.zip`（app\ 内容，manifest.url 指向它）与便携安装包 `CMBot-<ver>-portable.zip`；`launcher.py` 日志初始化健壮化（--windowed/只读根不崩）。语法校验通过；实际 PyInstaller 构建需在 Windows 跑
-- [ ] 退休 `scripts/update.ps1` 与 `scripts/install_local.ps1`
+- [x] 退休 `scripts/update.ps1` 与 `scripts/install_local.ps1`（已删除，git 历史可查）
 - [ ] 端到端实测（解压到 D 盘运行、自更新、回滚）
 
 ### 17.20 设置对话框（更新配置入口）