refactor(backend): clean up package re-exports, settings model properties, and unused signals

src/pygui/backend/wafer/__init__.py

@@ -1,12 +0,0 @@
-# ===== Wafer Sub-package =====
-from pygui.backend.wafer.family_spec import sensor_count_for
-from pygui.backend.wafer.wafer_layouts import available_families, load_layout
-from pygui.backend.wafer.zwafer_models import DataRecord, Sensor, ZWaferData
-from pygui.backend.wafer.zwafer_parser import ZWaferParser
-
-__all__ = [
-    "ZWaferData", "Sensor", "DataRecord",
-    "ZWaferParser",
-    "load_layout", "available_families",
-    "sensor_count_for",
-]

src/pygui/backend/wafer/wafer_layouts.py

@@ -66,7 +66,8 @@ def _family_name(raw_name: str) -> str:
 
 def _load_yaml(path: Path) -> dict:
     with path.open(encoding="utf-8") as f:
-        return yaml.safe_load(f)
+        loaded: dict = yaml.safe_load(f)
+        return loaded
 
 
 # TODO P6.3: expose this list to a new LayoutSelector.qml (4-button chooser)

src/pygui/backend/wafer/zwafer_parser.py

@@ -115,7 +115,7 @@ class ZWaferParser:
         y_coords: Optional[list],
     ) -> None:
         """Build sensor list from layout arrays."""
-        if not all([labels, x_coords, y_coords]):
+        if not (labels and x_coords and y_coords):
             raise ValueError("Sensor layout section is incomplete or missing.")
 
         if len(labels) != len(x_coords) or len(labels) != len(y_coords):