refactor: prune orphaned attic modules and standardize project configurations

- Move orphaned modules (data_segment.py, contour_models.py, marching_squares.py) to attic/.
- Standardize local settings logic, serial port parameters, and graph view plots.
- Update pyproject.toml pyside6-project dependencies and configure gitignore.

src/pygui/backend/wafer/zwafer_parser.py

@@ -33,10 +33,9 @@ class ZWaferParser:
     # ===== Header Parsing =====
     def _process_header(self, file_obj) -> ZWaferData:
         """Parse header and sensor layout from open file object.
-        
         Handles two CSV row orderings:
-          1. Label/X/Y rows BEFORE 'data' (fixture test format)
-          2. 'data' row BEFORE Label/X/Y (some real CSV files)
+        1. Label/X/Y rows BEFORE 'data' (fixture test format)
+        2. 'data' row BEFORE Label/X/Y (some real CSV files)
         The C# parser handles both by collecting sensor layout rows
         regardless of whether 'data' has been seen.
         """