✨ feat(vscode): 实施和审查会话行加启动箭头

不用再把卡片拖到「实施中」「审查」列：

- 实施会话id 行在有计划文件且没实施会话时显示 ▶，等同拖进实施中列
- 审查会话id 行在有 PR 时显示 ▶，按 PR 事件那套流程起 codex 审查

Claude-Session: https://claude.ai/code/session_01Kgmb1LvrPmFX3NoUDB4zZC

vscode/src/panel/readOnlyGuard.ts

@@ -14,6 +14,7 @@ export const OWNER_ONLY_MESSAGE_TYPES: ReadonlySet<string> = new Set([
   'session/focus',
   'session/resume-review',
   'session/resume-test',
+  'session/start-review',
   'session/start-test',
   'session/close-tab',
   'brainstorm/continue',