refactor: 移除 context-mode，Chrome 快照改为直接返回

context-mode 的 ctx_execute 系工具以真实 shell 执行且权限为 allow，绕过了
bash 策略与 protectedWrites；其每轮注入、独立 MCP 子进程与 skills 也与组合包
提示词单一所有权冲突。大输出职责已由 pi-overflow（入口截断）与
pi-compaction（压力遮蔽）承担：
- 删除 context-mode 依赖、wrapper/过滤器、skills，以及 ctx_* 的权限、
  tools.jsonc、路由规则、tool-search 常驻与 4 个分组
- better-sqlite3@12 仅为 context-mode 传递依赖，随之移除根 allowScripts
- pi-chrome：按用户决定移除快照隐私规则与 .pi/chrome-context 临时文件机制，
  快照 JSON 直接作为工具结果返回、details 只留小型元数据，超长由 pi-overflow
  截断并用 overflow_query 提取；授权生命周期不变

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

pi-tool-search/extensions/catalog.ts

@@ -335,7 +335,6 @@ export function writeCachedCatalog(cachePath: string, catalog: ToolCatalog): voi
 }
 
 const GROUP_QUERY_ALIASES: Record<string, string[]> = {
-  "context-execution": ["context mode", "run command", "test build logs", "执行命令", "运行测试", "分析日志"],
   "ssh-connection": ["ssh connect", "remote server connection", "连接服务器", "远程连接"],
   "ssh-remote-shell": ["ssh shell", "remote command", "remote terminal", "远程命令", "远程终端"],
   "ssh-remote-files": ["ssh file", "remote read write edit", "远程文件", "远程读写"],