Context. Sales by region and quarter — a 3×4 table of numbers. A heatmap turns the table into color, and annot=True keeps the numbers visible.
Your task. Write make_heatmap(grid) that draws a seaborn heatmap of the grid with the values printed in each cell, sets a title, and returns the axes.
Example. sns.heatmap(grid, annot=True) — the grid is already a table, so it goes in as-is.
Notes. No melting or pivoting needed here; heatmap wants exactly this rows-by-columns shape.