fix: remove avoidable model runtime limits

Preserve long histories and parsed attachments, expose paged process and Subagent output, isolate MCP discovery failures, and expand browser snapshots and knowledge result selection. Remove fixed Harness output and updated remote Runtime duration limits.

Keep released Agent profile and v1 bridge compatibility while enabling larger framed exchanges and optional limits for updated peers. Document remote coverage requirements and real-model boundary validation.

Release note: Long model tasks can retain more context and continue reading complete tool output; remote execution preserves compatibility with released Agents. Updated remote limits require an updated Agent and Runtime bundle.

src/shared/builtin-model-tools.ts

@@ -99,15 +99,22 @@ export const builtinModelTools = [
     name: 'process_execute',
     displayName: '进程执行',
     description:
-      '使用当前用户权限运行 PowerShell、Bash 或 Sh 命令，默认在工作区执行，也可指定其他工作目录。',
+      '使用当前用户权限运行 PowerShell、Bash 或 Sh 命令，可指定工作目录；长输出保留完整内容并支持分页续读。',
     access: 'write',
     group: 'programming'
   },
+  {
+    name: 'output_read',
+    displayName: '续读工具输出',
+    description: '按 cursor 分页读取当前会话已保留的进程或 Subagent 输出；会话释放后失效。',
+    access: 'read',
+    group: 'programming'
+  },
   {
     name: 'subagent_delegate',
     displayName: '编程 Subagent',
     description:
-      '将聚焦任务委派给同一模型连接；继承当前工作模式和工作区。',
+      '将聚焦任务委派给同一模型连接，继承当前工作模式和工作区；长输出可分页续读。',
     access: 'read',
     group: 'programming'
   }