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* RECTANG: add a Center Rectangle construction mode (#1127) The first point of RECTANG was always a corner. A new Center option makes it the rectangle's centre, so the second point (or Dimensions/Area) builds it outward evenly: centre 10,10 with a corner at 14,16 gives 6,4 to 14,16. - interactive: a Center keyword at the first prompt (Chamfer keeps the c shortcut; Center matches ce or the full word), which also changes the prompt to Specify center point for rectangle; - JSON: center: true on rectang, keeping p1/p2 and the default corner mode unchanged; - rotation turns about the centre; chamfer, fillet, width, elevation and thickness apply as before; the rubber band previews the centred rectangle; - params documentation updated. Tests: centre-point geometry for p2, dimensions and area, rotation, fillet, chamfer, width, thickness, the interactive keyword and preview, and the unchanged default corner mode. Fixes #1127 * docs: document the functions touched by #1127 * RECTANG: the Center option is CEnter, so C stays Chamfer's shortcut (as PLINE) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Brandon Thomas <echelon@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>