Add edge/contour shape locator (find rectangles/shapes without a template)#342
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Locate clickable regions on a screen you have never seen — no template, colour or text needed.
find_shapes(AC_find_shapes): Canny edge detection + contour extraction → bounding boxes of every distinct shape ({x,y,width,height,area,center,aspect}, largest first).min_area/max_areadrop specks and the full-frame border.find_rectangles(AC_find_rectangles): keeps only contours that approximate to a convex quadrilateral (buttons / cards / input fields).aspect_range=(min,max)filters w/h (e.g.(1.5,8)wide buttons,(0.8,1.2)square icons);epsilonis the approxPolyDP tolerance.haystack(ndarray/path/PIL) → headless-testable on synthetic arrays. Reusesvisual_match._haystack_gray. Wired through all 5 layers + headless test + EN/Zh docs + WHATS_NEW. Qt-free.