ianchb e73911f292 perf(restrict3): shrink X-pass ii sweep to required overlap window ...

- compute fi_min/fi_max from output i-range and derive ii_lo/ii_hi
 - replace full ii sweep (-1:extf(1)) with windowed sweep in Z/Y precompute passes
 - keep stencil math unchanged; add bounds sanity check for ii window

2026-03-02 17:37:13 +08:00

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