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After a solve, the per-layer current-density maps can be pushed into the open board as reference images on User.9..User.12 (stackup order, top first) - visible right in the editor, toggled like any layer, never plotted to gerbers. Dialog checkbox, default OFF; every push replaces all reference images on those layers. Rendering (fill_resistance/overlay.py, KiCad-free and tested headless): one pixel per grid cell, opaque over copper with the log scale lifted off the colormap's near-black bottom (dark canvas), transparent elsewhere, one pixel of half-alpha edge bleed so the overlay reaches the drawn outline instead of stopping half a cell short. Pushing lives in board_io (ReferenceImage via the IPC API, KiCad >= 10.0.1; scale = width / (pixels * 1 inch / 300 PPI), position = image center); kipy 0.7.1 swallows creation errors, so the per-item status is read from the raw CreateItemsResponse. pipeline.run takes an optional overlay callback; failures are reported, never fatal. tools/kicad_overlay_test.py pushes a fiducial alignment pattern (KiCad bbox readback verified placement to half a pixel); tools/ kicad_heatmap_overlay.py runs the whole thing headless against the open board, filtering marker rectangles of other nets' analyses via the exact copper test. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>