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/serialcomm/serial_port.py

@@ -196,7 +196,6 @@ class SerialPort:
           bytes 1016-1019 : Runtime   (2 bytes hex → decimal seconds)
           bytes 1020-1023 : Cycle time (2 bytes hex → decimal cycles)
         """
-        raw = bytes.fromhex(hex_response)
 
         family_code = self._hex_to_ascii(hex_response[0:2])
         serial_num = f"{family_code}{int(hex_response[2:6], 16):05d}"