Pen-plotter output

pattapatta targets machines that draw strokes, not paint engines that flood-fill pixels.

Rules of thumb

• Prefer fill="none" and a visible stroke
• “Fills” are hatches, packings, tilings, or offset contours — overview: Fills
• Boolean / morphology still build regions, but you plot their boundaries — see Operations

In scope

• Union / intersect / subtract / occlusion of closed paths
• Merged outlines (e.g. circle unions as stroked contours)
• Hatch lines, packing circles, Voronoi edges, mesh edges

Out of scope

• Solid CSS/SVG fills as the product goal
• Animation runners
• Faithful Processing PShape style bags (use portable geometry + your own stroke settings)

Repo ADR: docs/decisions/0002-pen-plotter-output.md.