=== D-metadata attempts=1 quota_waits=0 hard_fails=0 ===
cost=$0.2020432 turns=6
--- result ---
Exit code 0, 0 failures (68 tests, all passing). Fix: rewrote the two `ScannerControllerTest` cases to `backgroundScope.launch { scanResults.toList(...) }` + `runCurrent()` before emitting, so the collector subscribes before `onBarcodeScanned` fires (replay=0 semantics kept unchanged in production code).