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

package-lock.json

@@ -21,6 +21,7 @@
         "pi-hashline-edit": "0.8.3",
         "pi-hermes-memory": "file:./pi-hermes-memory",
         "pi-lsp": "0.1.7",
+        "pi-overflow": "file:./pi-overflow",
         "pi-ssh": "file:./pi-ssh",
         "pi-tool-search": "file:./pi-tool-search",
         "pi-web-search": "file:./pi-web-search",
@@ -5571,6 +5572,10 @@
         "typebox": "*"
       }
     },
+    "node_modules/pi-overflow": {
+      "resolved": "pi-overflow",
+      "link": true
+    },
     "node_modules/pi-ssh": {
       "resolved": "pi-ssh",
       "link": true
@@ -7093,6 +7098,29 @@
         "@earendil-works/pi-coding-agent": "*"
       }
     },
+    "pi-overflow": {
+      "version": "0.1.0",
+      "license": "MIT",
+      "devDependencies": {
+        "@earendil-works/pi-coding-agent": "latest",
+        "typebox": "latest"
+      },
+      "engines": {
+        "node": ">=22.19.0"
+      },
+      "peerDependencies": {
+        "@earendil-works/pi-coding-agent": "*",
+        "typebox": "*"
+      },
+      "peerDependenciesMeta": {
+        "@earendil-works/pi-coding-agent": {
+          "optional": true
+        },
+        "typebox": {
+          "optional": true
+        }
+      }
+    },
     "pi-permission-system": {
       "name": "@gotgenes/pi-permission-system",
       "version": "26.2.1",