Only a 2x2 (BigMarker) aimed item was ever tested -- a square's centroid and
its bounding-box centre are the same point, so N11 (aim point = bounding-box
centre instead of the true cell-average centroid) survived. AimingAtAnLShaped
ItemCentresOnItsCentroidNotItsBoundingBox equips a 3-cell L-tromino (Build's
new equipLMarker fixture), fires from a diagonal facing so the shape's true
asymmetry projects fully onto the lateral axis, and asserts the empirical mean
lateral offset tracks the item's own true centroid (computed by the test) and
not its bounding-box centre.
Manually verified against N11's own patch: it now fails (empirical -2.139,
tracking the wrong bounding-box prediction -2.121, against the true centroid
-1.886); the existing BigMarker test is unaffected since a square's two
candidate points coincide.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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