Acknowledge incorrect review feedback on raster coordinate generation

[Copilot]

Responded to feedback on PR #27 clarifying that the automated review comment about lines 216-217 in R/backend_sequential.R was incorrect.

Resolution

The current implementation correctly generates coordinate pairs in row-major order for terra rasters:

x_llc <- rep(x_llc_seq, times = nrows)  # 1,2,3, 1,2,3
y_llc <- rep(y_llc_seq, each = ncols)   # 10,10,10, 11,11,11
# Result: (1,10), (2,10), (3,10), (1,11), (2,11), (3,11) ✓

The suggested reversal would have caused length mismatches when nrows ≠ ncols and incorrect coordinate mappings. No code changes required.

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