feat: 接入 Pi 内置 codemode，并修复全面审查发现的问题

- codemode：Tool Search 常驻（alwaysEnabled）、权限 allow（嵌套调用仍逐个过权限门）、
  tools.jsonc 登记使用规则；RTK 跳过 parentToolCallId 嵌套调用，避免丢失 bash
  structuredContent；Tool Search 目录过滤 hidden / codemode（script-only）exposure；
  扩展加载测试加载 builtin:codemode 并断言其常驻激活
- 搜索 key 不再经命令行参数传递：search-auth.mjs 改为 --set-stdin（先读校验再加锁），
  configure.sh 交互输入经管道、非交互用 --<provider> -
- CodeGraph 客户端监听子进程 stdin error，避免 EPIPE 未处理导致崩溃
- 移除 PI_TOOL_SEARCH/HERMES_MEMORY/RTK_CONFIG_PATH 环境变量入口，测试改用工厂 configPath 注入
- pi-subagents 固定 vitest / coverage-istanbul 4.1.10，修复 npm ls 版本冲突
- 补 pi-web-search / pi-worktree UPSTREAM.md 与 pi-minimal-footer AGENTS.md，
  files 白名单补齐并加测试；.codegraph/.gitignore 移出跟踪
- detect_kitty 优先识别官方安装目录

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

config/pi-permission-policy.jsonc

@@ -82,6 +82,9 @@
     // pi-overflow's inspector reads only the extension's own stored output
     // directory (id-validated); pinned in Tool Search's alwaysEnabled set.
     "overflow_query": "allow",
+    // A codemode script does nothing by itself: every nested tool call it makes
+    // runs through this same gate (Pi emits tool_call with parentToolCallId).
+    "codemode": "allow",
 
     // Model-chosen URLs can exfiltrate data — same reason curl/wget ask.
     "web_fetch": "ask",

config/prompt/tools.jsonc

@@ -32,6 +32,13 @@
     "find": { "inherit": true },
     "multi_grep": { "inherit": true },
     "tool_search": { "inherit": true },
+    "codemode": {
+      "guidelines": [
+        "Use codemode to batch two or more independent tool calls (Promise.allSettled), chain dependent lookups, or filter large output down to what you need; call a single tool directly instead of wrapping it in a script.",
+        "Call edit, write, ssh_connect, ssh_cd, ask_user_question, and Agent directly, never from a codemode script.",
+        "Inside scripts, search with tools.grep, tools.find, or tools.multi_grep; never run grep, find, rg, or fd through tools.bash."
+      ]
+    },
 
     "codegraph_explore": { "inherit": true },
     "lsp_diagnostics": { "inherit": true },

config/tool-search.json

@@ -9,7 +9,8 @@
     "memory_remove",
     "skill_manage",
     "context_tree_query",
-    "overflow_query"
+    "overflow_query",
+    "codemode"
   ],
   "showToolSearchFooterStatus": false,
   "maxActiveGroups": 5,