Files
WQ_GUI/src/postprocessing
duxin 8f03dcb10b perf: Local Kriging 500m spatial window + multiprocessing
Local Kriging: grid split into 500m blocks, each block uses only
sample points within block+buffer zone. Covariance matrix shrinks
from 8242x8242 to local nxn. 10M+ grid cells now finish in minutes.

Complexity:
  Global: O(G * P * logP * K^3) = hours for large grids
  Local:  O(sum(block*grid * block*points * 15^3)) = minutes
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