feat: export TelemetryStatus from the package root

client.telemetry_status exists so downstream can reconcile telemetry
programmatically, but annotating its return type meant reaching into
polygateway.types while the convention here is that the top-level
exports are the public API surface. The port itself stays unexported:
nobody outside the library implements it.

src/polygateway/__init__.py

@@ -31,6 +31,7 @@ from polygateway.types import (
     OcrLayoutResult,
     OcrTextResult,
     SourceConfig,
+    TelemetryStatus,
 )
 
 __version__ = "1.2.4"
@@ -61,6 +62,7 @@ __all__ = [
     "SourceConfig",
     "SourceDeadError",
     "SourceNotConfiguredError",
+    "TelemetryStatus",
     "TransientError",
     "__version__",
     "gather_bounded",