fixup: 处理 PR #386 review 中尚未覆盖的 4 项

- src/cli/print.ts: cron onFire 改用 createAutonomyQueuedPromptIfNoActiveSource
  并以 prompt 文本作为 sourceId，避免同一定时提示在前一次 run 仍活跃时被重复
  入队叠加；顺手移除 4 个已没人引用的 dead import
  (commitAutonomyQueuedPrompt / prepareAutonomyTurnPrompt /
   markAutonomyRunCancelled / createAutonomyQueuedPrompt)
- src/services/compact/postCompactCleanup.ts: 在 void import().then() 处加
  注释，明确 sweepFileContentCache 是有意的 fire-and-forget，函数对外保持
  同步签名是设计而非疏忽
- src/utils/autonomyFlows.ts: 给 selectPersistedAutonomyFlows 的两阶段排序
  加文档注释（先按 active+updatedAt 选 top-N，再统一按 updatedAt 重排）
- tests/integration/autonomy-lifecycle-user-flow.test.ts: stderr 断言失败时
  把实际 stderr 内容写进 message，方便 CI 失败时定位

src/services/compact/postCompactCleanup.ts

@@ -69,6 +69,12 @@ export function runPostCompactCleanup(querySource?: QuerySource): void {
   // cacheUtils resets. See compactConversation() for full rationale.
   clearBetaTracingState()
   if (feature('COMMIT_ATTRIBUTION')) {
+    // Intentionally fire-and-forget: the file-content cache sweep is a
+    // best-effort memory release whose completion no caller depends on.
+    // Keeping `runPostCompactCleanup` synchronous lets compaction call sites
+    // (REPL post-compact handler, /compact command, autoCompact) finish their
+    // own state transitions without an extra microtask round-trip — the sweep
+    // catches up on the next event-loop tick.
     void import('../../utils/attributionHooks.js').then(m =>
       m.sweepFileContentCache(),
     )