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/architecture/performance-principles.md

@@ -139,3 +139,5 @@ Main 负责窗口、生命周期、权限和消息转发。数据库查询、文
 | P5 | 已基本满足：消息、会话、笔记、文件树、知识库文档表格都只渲染可见部分 |
 | P6 | 空配置启动到输入框可用约 0.96 秒；真实数据（2.4 GB）约 1.36 秒。本地工具环境已后台初始化，低频模块按需加载 |
 | P9 | 性能阈值还没有接入 CI，也没有真实低端机的基线 |
+
+2026-10-04 补充：监督回顾的来源初始化和继续前版本校验已移入现有 Worker 入口的独立连接，扫描不持有写锁，清单按 200 条提交，生产失败不回退 Main 同步扫描。最终发布事务仍在 Main；实现与实测边界见[监督者进度](../features/conversation-supervision/progress.md#2026-10-04-回顾初始化阻塞修复)。