feat(pi-overflow): 新增统一的新工具结果展示截断扩展

此前截断分散在多层且互相冲突：Pi bash 保留尾部 50KB，RTK 兜底截断又只留
开头 12000 字符（砍掉报错与完整输出路径），pi-chrome 截开头 30K，web_fetch
各 provider 不一致。新扩展统一负责"新结果给模型看多少"：
- capture.ts 最先加载暂存原文，index.ts 最后加载（system-prompt 之前）
- 超过 24K 字符时原文落盘 <agentDir>/my-pi/pi-overflow/（700/600、原子写），
  优先取 bash fullOutputPath 完整文件；模型看到 头 + 中段信号行 + 尾 的有界
  视图，行号基于落盘原文、结尾永远可见
- overflow_query：按 id 正则搜索、行区间、jsonPath 只读查询，id 校验防穿越
- 收编：RTK truncate 默认关闭、删除 pi-chrome truncateText、web_fetch 默认
  每页 20000（上限 100000）、web_search max_results 限定 1–20
- pi-compaction 遮蔽带 details.overflow.id 的结果时在占位符提示 overflow_query
- 登记 tools.jsonc / routing / 权限 allow / tool-search 常驻与分组

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config/prompt/routing.jsonc

@@ -65,6 +65,10 @@
       "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."
     },
+    {
+      "whenAny": ["overflow_query"],
+      "text": "When a tool result starts with or ends with a [pi-overflow id=…] marker, the full original output is stored; inspect it with overflow_query (search, line ranges, or jsonPath) instead of re-running the command or dumping it again."
+    },
     {
       "whenAny": ["read"],
       "text": "Use read only when exact source is needed or the file is small. Before editing, request the smallest useful offset/limit range; do not read a complete large file merely to copy, compare, hash, count, explore, or summarize it."

config/prompt/tools.jsonc

@@ -62,6 +62,7 @@
     "memory_remove": { "inherit": true },
     "skill_manage": { "inherit": true },
     "context_tree_query": { "inherit": true },
+    "overflow_query": { "inherit": true },
 
     "ask_user_question": { "inherit": true },