<!-- SCORING: [1] refactor: Update CONTEXT.md with architecture section -->

refactor: Update CONTEXT.md with architecture section

CONTEXT.md

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+# OpenCAD Context
+
 Project Goal: To build an open source cross-platform Fusion 360 3D CAD clone using C++, Qt, and OpenGL. 
 
 Features should be as close to Fusion 360 as possible.
 
 Don't ask for unrelated files to be added to the chat.
 
-Development Summary:
+## Architecture
+
+...
+
+## Development Summary:
 
  1 Initial Setup: We created the basic application structure with a MainWindow class. This window was set up with a top toolbar to act as a banner for tools and a central widget area as a
    placeholder for the 3D viewport.