Cumulative local energy-conservation residual at the CO/He core boundary (left) and the photosphere shell (right) over the 0–58 day evolution of the stripped-star model. Solid curves are the fixed computational grid, on which SNEC and SuperSNEC agree to machine precision (Section 4.1); dashed curves are the SuperSNEC adaptive grid at N = 100, 200, 500, and 1000. On the fixed grid, the residual stays below 0.1% and is essentially independent of zone count, while the adaptive remap adds a residual that decreases monotonically with zone count, reaching the fixed-grid level by N ≈ 500.