Stale-G-code banner, per-port pressure ownership, undo stack, auto-render

Drop raster lines no head prints from the shared motion; {preset} markers

Add Download All zip, sliced-layer preview; always-on shared motion and G1 moves

Keep circle-spiral rings uniform in parallel prints, drop PathOrigin from G-code

Add Simple Shapes sample set, fix parallel circle-spiral edges, align spiral loops

Step circle spiral by whole rings and make lead-in per shape

Add 45-degree woodpile raster and seam-free split contours

Improve parallel printing: shared contours, exact auto-align, infill %

Add vector G-code pipeline