With Part 1 I had started building a 2D grid map, but figured Part 2 would blow that up (and was right).
The directions were like old pen/turtle tutorials. I converted into polygon points (676 vertices). I ran the path through the middle of the cells to include borders (0.5, 0.5 origin).
I added a function to calculate the area of irregular polygons. I expanded the path at the end to include the borders within area.
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