feat: 组合包配置以包内 config/ 为唯一来源，并新增受保护写入人工审批

配置统一：权限策略、硬防御、Tool Search、提示词封面以及新迁入的
RTK、pi-compaction、pi-worktree、pi-hermes-memory 配置全部由扩展
直接读取已安装组合包内的 config/，pi install / pi update 即完成部署；
删除 rebuild-bundle-config.mjs 与 bundle-manifest.json，my-pi/ 只保留
日志与缓存。update.sh 成功升级后将默认 git 来源的已安装副本
reset 回发布版本。AGENTS.md 新增「组合包配置原则」。

脚本整合：search_config.sh / ssh_config.sh 合并为 configure.sh
search|ssh；install.sh / update.sh 共享函数抽到 scripts/lib.sh，远程
安装器改为先下载到临时文件再执行，下载失败可被检测。

权限：hard-guards 新增 protectedWrites，写入 Pi 凭据/设置、已安装
组合包与扩展目录、pi-ssh 凭据库时一律人工确认（跳过 AutoReview、
yolo 与 Session grant，无 UI 时拒绝）；放行 ls、LSP 查询、ctx 只读、
web_search、Chrome 只读与 git 只读命令，skill_manage 改为 ask。

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pi-tool-search/README.md

@@ -71,7 +71,7 @@ The first loads are purely additive and retain Pi's native deferred-loading prop
 
 ## Configuration
 
-Pi reads this configuration from `<agent-dir>/my-pi/tool-search/config.json` (normally `~/.pi/agent/my-pi/tool-search/config.json`), deployed by the bundle's `install.sh` / `update.sh` from `config/tool-search.json`. A missing, unreadable, or invalid file falls back to the built-in `BUNDLE_TOOL_SEARCH_DEFAULTS`; the extension never writes the file:
+Pi reads this configuration directly from the installed bundle's `config/tool-search.json` — the single source of truth, refreshed by `pi update`. A missing, unreadable, or invalid file falls back to the built-in `BUNDLE_TOOL_SEARCH_DEFAULTS`; the extension never writes the file:
 
 ```json
 {
@@ -117,7 +117,7 @@ Example override:
 }
 ```
 
-An explicit override larger than `maxDynamicTools` remains visible but cannot be activated until the limit or override is corrected. Every `install.sh` / `update.sh` run rebuilds the file together with the rest of the `my-pi/` tree, so hand edits are overwritten — change `config/tool-search.json` in the bundle repository for durable customization.
+An explicit override larger than `maxDynamicTools` remains visible but cannot be activated until the limit or override is corrected. To customize, edit `config/tool-search.json` in the bundle repository and update the bundle — `pi update` refreshes the installed copy.
 
 ## Current host integration