merge(dev): resolve latest manager and runtime-fallback conflicts

Sync the PR branch with the newest dev branch and resolve the new import-level conflicts in background-agent manager and runtime-fallback tests. Preserve both the delegated bootstrap coverage from this branch and the newer upstream test utilities and runtime wiring changes, then re-verify the affected delegated fallback suites and typecheck.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/tools/delegate-task/sync-task.ts

@@ -188,6 +188,7 @@ export async function executeSyncTask(
       args,
       promptText: delegatedPromptText,
       systemContent,
+      directory: createSessionResult.parentDirectory,
       toastManager,
       taskId,
       sisyphusAgentConfig: executorCtx.sisyphusAgentConfig,