refactor(runner,android): drop unused bringToForeground return; grep no-match yields empty

bringToForeground's bool return was read by no caller. FocusedWindowPackage's on-device grep exited 1 on no match, surfacing as an error instead of the documented ""; add || true.

internal/android/android.go

@@ -456,8 +456,9 @@ func FocusedWindowPackage(ctx context.Context, serial string) (string, error) {
 	}
 	// Grep the focus line on-device: the full dumpsys window output is large and
 	// this runs on the per-step scope guard, so transferring it whole would add
-	// latency to every step.
+	// latency to every step. `|| true` keeps a no-match (grep exit 1) from
-	output, err := exec.CommandContext(ctx, adb, adbArgs(serial, "shell", "dumpsys window | grep mCurrentFocus")...).Output()
+	// surfacing as an error so it yields "" per the contract.
+	output, err := exec.CommandContext(ctx, adb, adbArgs(serial, "shell", "dumpsys window | grep mCurrentFocus || true")...).Output()
 	if err != nil {
 		return "", err
 	}

internal/runner/runner.go

@@ -535,18 +535,16 @@ func awaitForeground(ctx context.Context, options Options, logger *slog.Logger,
 
 // bringToForeground returns the app under test to the foreground. It first
 // presses BACK to dismiss any modal system dialog (a relaunch alone does not
-// close one), then relaunches and waits for the UI to settle. Returns true
+// close one), then relaunches and waits for the UI to settle.
-// when the relaunch itself succeeded.
+func bringToForeground(ctx context.Context, options Options, logger *slog.Logger, stepIndex int) {
-func bringToForeground(ctx context.Context, options Options, logger *slog.Logger, stepIndex int) bool {
 	if err := options.Driver.PressKey(ctx, "back"); err != nil {
 		logger.Warn("dismiss key before relaunch failed", "step", stepIndex, "err", err)
 	}
 	if err := options.Driver.Launch(ctx, options.BundleID, false, nil); err != nil {
 		logger.Warn("relaunch failed", "step", stepIndex, "err", err)
-		return false
+		return
 	}
 	settleForForeground(ctx, options)
-	return true
 }
 
 // settleForForeground waits one idle window for the UI to settle, bounding the