feat(workflow): add workflow engine, /workflows panel, /ultracode skill

将 feat/sdk-backend 分支中 workflow 相关的 20 个 commit 压缩为单 commit：

- 工作流引擎核心：phase / agent / parallel / pipeline 编排原语（packages/workflow-engine/）
- /workflows 面板：三区焦点布局（顶部 run tabs + 左侧 phase 侧栏 + 右侧 agent 列表）
- /ultracode skill：多 agent workflow 编排入口
- 进度存储 / journal / notification 系统
- WorkflowService 生命周期管理 + SentryErrorBoundary
- 脚本沙箱：禁用 dynamic import()、JSON args 防御性归一化
- journal 与 named-workflow 路径统一在 projectRoot
- 错误处理：parallel/pipeline hooks 错误日志、failure routing、semaphore abort
- workflow 工具升级为 core 工具 + PascalCase 命名

Co-Authored-By: glm-5.1 <zai-org@claude-code-best.win>

src/workflow/__tests__/useWorkflowKeyboard.test.ts

@@ -0,0 +1,30 @@
+import { expect, test } from 'bun:test'
+import { routeWorkflowKey } from '../panel/useWorkflowKeyboard.js'
+
+test('Tab → nextTab；Shift+Tab → prevTab', () => {
+  expect(routeWorkflowKey('', { tab: true })).toBe('nextTab')
+  expect(routeWorkflowKey('', { tab: true, shift: true })).toBe('prevTab')
+})
+
+test('q / Esc → quit', () => {
+  expect(routeWorkflowKey('q', {})).toBe('quit')
+  expect(routeWorkflowKey('', { escape: true })).toBe('quit')
+})
+
+test('x → kill；r → resume；n → newRun', () => {
+  expect(routeWorkflowKey('x', {})).toBe('kill')
+  expect(routeWorkflowKey('r', {})).toBe('resume')
+  expect(routeWorkflowKey('n', {})).toBe('newRun')
+})
+
+test('←/→ 切焦点列；↑/↓ 列内移动', () => {
+  expect(routeWorkflowKey('', { leftArrow: true })).toBe('focusLeft')
+  expect(routeWorkflowKey('', { rightArrow: true })).toBe('focusRight')
+  expect(routeWorkflowKey('', { upArrow: true })).toBe('moveUp')
+  expect(routeWorkflowKey('', { downArrow: true })).toBe('moveDown')
+})
+
+test('无关输入 → null', () => {
+  expect(routeWorkflowKey('z', {})).toBeNull()
+  expect(routeWorkflowKey('', {})).toBeNull()
+})