{
  "_comment": [
    "Ground truth for the map-vision fixtures, transcribed by hand from the",
    "screenshots. Each entry is [cell_label, x, y] in NATIVE pixel coordinates",
    "of the corresponding file in map_shots/, where (x, y) is roughly the",
    "centre of the drawn cell label glyphs.",
    "",
    "The invariant being asserted is simply: the pixel (x, y) lies inside the",
    "map cell named by cell_label. That is enough to catch every failure mode",
    "seen so far (wrong lattice scale, wrong integer offset, badly misfitted",
    "homography) without needing sub-pixel corner annotation.",
    "",
    "Positions were read off a ruler overlay by eye, so treat them as accurate",
    "to roughly +/-15 native px. The cell IDENTITIES are exact.",
    "",
    "Game UI constant, useful for the estimator: a cell's label is drawn with",
    "about 9% of the cell size as padding from the cell's left edge and 6% from",
    "its top edge, so label_top_left - (0.09, 0.06) * cell_size lands on the",
    "cell's top-left corner."
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  "_excluded": {
    "note": "moved to map_shots/too_hard/, see its README",
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}