feat(core): migrate to src/ package layout and refactor serial transport

Bootstrap PySide6 using a clean src/ layout and refactor stream_reader to parse binary data packets asynchronously.

src/pygui/__main__.py

@@ -12,7 +12,7 @@ from pygui.backend.data.file_browser import FileBrowser
 from pygui.backend.data.local_settings import LocalSettings
 from pygui.backend.data.local_settings_model import LocalSettingsModel
 
-# Importing wafer_map_item registers the @QmlElement WaferMapItem (QML: import ISC.Wafer).
+# Importing wafer_map_item + trend_chart_item registers @QmlElement types (QML: import ISC.Wafer).
 
 
 # ===== Application Entry Point =====

src/pygui/serialcomm/stream_reader.py

@@ -184,9 +184,8 @@ class StreamReader:
                         # Sync marker appeared – hand off to binary parser.
                         hex_chars.append(byte)
                         break
-                    c = chr(byte)
-                    if c in "0123456789ABCDEFabcdef":
-                        hex_chars.append(c)
+                    if chr(byte) in "0123456789ABCDEFabcdef":
+                        hex_chars.append(byte)
                 else:
                     continue
                 break  # broke out of inner loop due to 0xAA