test: regression for streamPodLogsOnce bail timer (FAR-10)

Uses vi.mock on k8s-client and vi.useFakeTimers to prove that when
logApi.log() never resolves (the FAR-10 hang shape) and stopSignal
fires, streamPodLogsOnce still returns within the bail window
(LOG_STREAM_BAIL_TIMEOUT_MS).  Exports streamPodLogsOnce so the test
can call it directly.  Also covers the no-stopSignal happy path.

269/269 passing (+2 new).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/execute.ts

@@ -248,7 +248,7 @@ async function waitForPod(
  * Stream pod logs once via follow. Returns accumulated stdout when the
  * stream ends (container exit, API disconnect, or abort signal).
  */
-async function streamPodLogsOnce(
+export async function streamPodLogsOnce(
   namespace: string,
   podName: string,
   onLog: AdapterExecutionContext["onLog"],