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

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

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

pi-tool-search/extensions/bundle-groups.ts

@@ -85,42 +85,6 @@ export const BUNDLE_GROUP_DEFINITIONS: BundleGroupDefinition[] = [
     keywords: ["web", "search", "fetch", "news", "docs", "网页", "搜索", "新闻", "文档"],
     tools: ["web_search", "web_fetch"],
   },
-  {
-    id: "context-execution",
-    title: "Context-isolated execution",
-    summary: "Run commands or analyze large files in a sandbox while returning only compact derived output.",
-    useWhen: ["Logs, tests, builds, generated data, commands, or workspace files may produce large output"],
-    avoidWhen: ["Exact source lines are needed for an anchored edit"],
-    keywords: ["execute", "large file", "logs", "tests", "build", "大文件", "日志", "测试", "构建"],
-    tools: ["ctx_execute", "ctx_execute_file", "ctx_batch_execute"],
-  },
-  {
-    id: "context-knowledge",
-    title: "Context knowledge base",
-    summary: "Index local or web documentation and retrieve focused passages from the persistent context-mode knowledge base.",
-    useWhen: ["Documentation or session knowledge should be stored and queried without rereading raw content"],
-    avoidWhen: ["A one-shot small source can be read directly"],
-    keywords: ["index", "search", "knowledge base", "fetch docs", "索引", "知识库", "文档检索"],
-    tools: ["ctx_index", "ctx_search", "ctx_fetch_and_index"],
-  },
-  {
-    id: "context-observability",
-    title: "Context observability",
-    summary: "Inspect context-mode health, savings statistics, and the hosted Insight dashboard.",
-    useWhen: ["Diagnosing context-mode or reviewing context savings and analytics"],
-    avoidWhen: ["The task is normal code or data processing"],
-    keywords: ["stats", "doctor", "insight", "health", "统计", "诊断", "上下文节省"],
-    tools: ["ctx_stats", "ctx_doctor", "ctx_insight"],
-  },
-  {
-    id: "context-administration",
-    title: "Context administration",
-    summary: "Upgrade context-mode or destructively purge indexed context data.",
-    useWhen: ["The user explicitly asks to upgrade context-mode or purge a named scope"],
-    avoidWhen: ["Routine searching, indexing, or performance inspection"],
-    keywords: ["upgrade", "purge", "delete", "升级", "清除", "删除知识库"],
-    tools: ["ctx_upgrade", "ctx_purge"],
-  },
   {
     id: "memory-recall",
     title: "Persistent memory recall",