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>

package.json

@@ -24,7 +24,6 @@
     "pi-compaction/LICENSES",
     "pi-compaction/UPSTREAM.md",
     "pi-chrome/extensions",
-    "pi-chrome/src",
     "pi-chrome/package.json",
     "pi-chrome/README.md",
     "pi-chrome/CHANGELOG.md",
@@ -125,7 +124,6 @@
       "./extensions/codegraph.ts",
       "./pi-rtk-optimizer/index.ts",
       "./extensions/hashline.ts",
-      "./extensions/context-mode.ts",
       "./extensions/lsp.ts",
       "./pi-hermes-memory/src/index.ts",
       "./pi-compaction/index.ts",
@@ -141,9 +139,6 @@
       "./pi-tool-search/extensions/index.ts",
       "./pi-overflow/index.ts",
       "./extensions/system-prompt.ts"
-    ],
-    "skills": [
-      "./node_modules/context-mode/skills"
     ]
   },
   "dependencies": {
@@ -152,7 +147,6 @@
     "@ogulcancelik/pi-minimal-footer": "file:./pi-minimal-footer",
     "@smoose/pi-notify": "file:./pi-notify",
     "@tintinweb/pi-subagents": "file:./pi-subagents",
-    "context-mode": "1.0.169",
     "jiti": "2.7.0",
     "pi-ask-user": "file:./pi-ask-user",
     "pi-chrome": "file:./pi-chrome",
@@ -192,8 +186,5 @@
   },
   "engines": {
     "node": ">=22.19.0"
-  },
-  "allowScripts": {
-    "better-sqlite3@12.11.1": true
   }
 }