grabowski
c91d63663b
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Roads take sidewalks (none, both, left, right): 12 cm high paving with kerb faces drawn where they face the viewer. Road curve (radius, angle, left/right) carries a street round a bend; centre lines are true arcs when cut and offset, so curve joints are seamless. A road ending on another road's centre line opens that road's kerb and sidewalk (T junction); two roads ending at one corner close it. Roundabout: ring radius and width, one or two lanes, up to four arms with flared kerbs, splitter islands, give-way lines on the entry side (traffic on the left or right) and a central island with apron. Studio: a road run drawn corner by corner gets a curve in each corner (prefab meta `corner`). Tooltips list the streets each one meets. Engine: open `polyline` primitive (Prim::Poly open) so dashes run on round curves. examples/streets and a Streets demo in the web Studio; MCP guidance, docs. ROADMAP: backlog 5-7 done; multi-select and the hosted copy marked done. Tests: Rust 72, Studio 113, web 95.
