Add WallPlotter p5 library with zigzag example.

Standalone package for Marlin polargraph control over Web Serial, including API docs and a runnable zigzag sketch.

Co-authored-by: Cursor <cursoragent@cursor.com>

examples/zickzack/sketch.js

@@ -0,0 +1,52 @@
+let wp;
+
+let area = 400;
+
+function setup() {
+  const canvas = createCanvas(windowWidth, windowHeight);
+  canvas.parent('sketch-host');
+
+  wp = new WallPlotter();
+  wp.setSpeed(10000, 10000);
+  wp.setTimingMultiplier(1); // tune if machine is slower than speed estimate, the higher the slower
+  wp.enableKeyInputs();
+  wp.enablePlotButtons();
+}
+
+function draw() {
+  background(28, 28, 32);
+  wp.showInfos();
+}
+
+function windowResized() {
+  resizeCanvas(windowWidth, windowHeight);
+}
+
+async function plot() {
+  await drawArt(false);
+}
+
+async function test() {
+  await drawArt(true);
+}
+
+async function drawArt(testOnly) {
+  wp.startPath();
+
+
+  wp.move(-area, -area);
+  wp.wait(1000 * 10);
+
+  let step = area / 20;
+
+  for (let y = -area; y < area; y+=step){
+    for (let x = -area; x < area; x+=step){
+      if(random(1) < 0.8){
+        wp.move(x, y);
+        wp.draw(x, y+step);
+      }
+    }
+  }
+
+  await wp.runPath(testOnly);
+}