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>

tests/system-prompt-cover.test.ts

@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { dirname, join, resolve } from "node:path";
 import test from "node:test";
@@ -139,14 +139,16 @@ test("spliceCover keeps an attribute-bearing nested tag inside its parent sectio
   );
 });
 
+test("resolveCoverPath points at the bundle config file", () => {
+  assert.equal(resolveCoverPath(), bundledCoverPath);
+});
+
 test("readCoverFile returns undefined when the file is absent or blank", async () => {
   const dir = await makeTempDir();
   try {
-    const coverPath = resolveCoverPath(dir);
-    assert.equal(coverPath, join(dir, "my-pi", "system-prompt-cover.md"));
+    const coverPath = join(dir, "system-prompt-cover.md");
     assert.equal(readCoverFile(coverPath), undefined);
 
-    await mkdir(dirname(coverPath), { recursive: true });
     await writeFile(coverPath, "   \n\n", "utf8");
     assert.equal(readCoverFile(coverPath), undefined);