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>

config/prompt/routing.jsonc

@@ -50,20 +50,8 @@
       "text": "Use web_search for current, real-world, or citable web information; provider selection is handled internally. Keep queries focused and use site/published_* filters only when they materially narrow results. Read selected pages with web_fetch instead of repeating similar searches."
     },
     {
-      "whenAll": ["web_fetch", "ctx_fetch_and_index"],
-      "text": "Read a web page with web_fetch. Use ctx_fetch_and_index only when the content should be indexed into the context-mode knowledge base for repeated ctx_search queries."
-    },
-    {
-      "whenAny": ["ctx_execute", "ctx_execute_file", "ctx_batch_execute"],
-      "text": "Use Context Mode for logs, test/build output, generated data, large-file exploration/analysis/summarization, and any command whose output may be large or unpredictable. Prefer one ctx_batch_execute over several ctx_execute calls for multi-command research, and print only the derived answer needed for the task."
-    },
-    {
-      "whenAny": ["ctx_execute_file"],
-      "text": "ctx_execute_file analyzes a file and never edits it; make changes with read + edit. It is confined to the current project root: do not call it for absolute paths outside the workspace, ../ traversal, or symlinks that resolve outside the workspace; host permission approval does not bypass this boundary. Use another explicitly authorized tool for those files."
-    },
-    {
-      "whenAll": ["chrome_snapshot", "ctx_execute_file"],
-      "text": "After chrome_snapshot or a Chrome action with includeSnapshot=true, immediately analyze the returned workspace-relative capture path with ctx_execute_file; never use read or cat for the raw JSON. Print only the uids, text, or state needed for the next action, and take a fresh snapshot after any interaction because the previous capture may be stale."
+      "whenAll": ["chrome_snapshot", "overflow_query"],
+      "text": "chrome_snapshot (and Chrome actions with includeSnapshot=true) return the page snapshot JSON directly. When it is large the result carries a [pi-overflow id=…] marker: extract only the uids, text, or state you need with overflow_query (jsonPath or search) instead of taking another snapshot, and take a fresh snapshot after any page interaction because the previous one is stale."
     },
     {
       "whenAny": ["overflow_query"],