feat: unify execution and add workspace file imports

Remove Ask/Execute modes and general product tool approvals so requests use the selected runtime, enabled capabilities, and execution account permissions. Migrate retired application metadata while preserving user content.

Retire the Results page while retaining conversation images and stored artifacts. Add local and remote workspace file imports, timestamps and sorting, improve image discovery and saving, and refine workspace navigation and supervision responsiveness. Include the accompanying web-search changes, tests, probes, and product documentation.

Remote imports require an updated Agent. Existing artifacts are not automatically copied into project directories. Validation evidence and outstanding failures remain documented in feature progress files; no full test suite or real-model calls were rerun for this commit.

Release note: Run requests without switching work modes, import files into a selected local or remote workspace folder, sort workspace files by date, and keep using conversation images after removal of the Results page.

docs/features/assistant-workbar/README.md

@@ -1,6 +1,7 @@
 # 助手工作栏
 
-助手工作栏统一承载本机与远程执行空间、Task、成果、文件、浏览器、终端和笔记等持续工作界面。
+助手工作栏统一承载本机与远程执行空间、Task、文件、浏览器、终端和笔记等持续工作界面。
+成果页已移除；项目文件统一在工作区查看和导入，会话图片继续由消息引用读取。
 
 “笔记”为应用级、可关闭的单实例 Tab，新布局默认不打开。它提供搜索、浏览和快速追加文字，
 与主页面魔法笔记共用存储；会话采集、来源跳转与草稿规则由
@@ -16,10 +17,12 @@
 | [浏览器多实例技术设计](./browser-tabs-technical-design.md) | 浏览器 Tab 身份、Conversation 绑定、IPC、BrowserService 和 MCP 路由 |
 | [实现与验证进度](./progress.md) | 工作区与 Runtime 相关改动的实现事实、验证证据与剩余阻塞 |
 | [执行记录存储与升级回收](./execution-history-storage.md) | 子任务差量存储、远程去重、旧库转换、会话置顶、摘要与完整历史按需读取、内存引用释放 |
+| [工作区文件导入与时间](./workspace-files.md) | 真实文件来源、导入操作、排序、图片存储边界及本机和远程实现 |
 | [Runtime 交互边界](./runtime-interactions.md) | 原生权限、结构化问答、后台拒绝、终端交互、并行与输出、消息请求状态及资源生命周期规则 |
 | [Runtime 进程复用技术设计](./runtime-process-reuse-technical-design.md) | 跨 Runtime 资源调研、锁定协议证据、进程与会话拆分、远端模型桥、实施顺序和性能验收 |
 | [Runtime 原生客户端启动方案](./runtime-native-client-proposal.md) | Local terminal/DS Web shortcut requirements, startup rules, current integration, validation boundaries and remaining remote/resource work |
 | [Runtime 执行清单技术设计](./runtime-checklist-technical-design.md) | OC/CN 原生清单提取、远程 Agent 传递复用、消息恢复与真实部署验收；尚未实现 |
+| [移除 Ask / Execute 工作模式](../unified-execution/README.md) | 跨入口统一执行、历史字段迁移及清除数据入口；主要源码已落地，定向 UI/Host 通过，完整验收待完成 |
 
 当前尚未拆出独立 User Stories、功能逻辑和 UI 设计文档；产品场景与验收保留在现有 PRD，
 Runtime 资源状态规则由交互边界文档维护。浏览器多实例和 Runtime 进程复用涉及不同的