Initial

tools/render-svg.mjs

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+/* Render a scene to SVG from the CLI (shares the scene module).
+   Two modes:
+     node tools/render-svg.mjs --seed SEED [outfile] [sizePx]   (seed → all params)
+     node tools/render-svg.mjs [preset] [seed] [outfile]        (legacy preset mode)
+*/
+import { writeFileSync } from 'node:fs';
+import { generateScene } from '../src/scene/scene.js';
+import { renderSVG } from '../src/render/svgVector.js';
+import { paramsFromSeed } from '../src/scene/params.js';
+import { GROUPS, TOGGLES, FIXED, PRESETS } from '../src/ui/controls.js';
+
+const argv = process.argv.slice(2);
+let params, out, size = 4800;
+
+if (argv[0] === '--seed') {
+  const seed = argv[1] || 'ENTROPY-001';
+  params = { ...FIXED, ...paramsFromSeed(seed) };
+  out = argv[2];
+  if (argv[3]) size = +argv[3];
+} else {
+  const [preset, seed, o] = argv;
+  params = { ...FIXED, seed: seed || 'ENTROPY-001' };
+  for (const g of GROUPS) for (const c of g.controls) params[c.id] = c.value;
+  for (const t of TOGGLES) params[t.id] = t.value;
+  if (preset && PRESETS[preset]) Object.assign(params, PRESETS[preset]);
+  if (seed) params.seed = seed;
+  out = o;
+}
+
+const svg = renderSVG(generateScene(params), params, size);
+const file = out || `/tmp/bc-${params.seed}.svg`;
+writeFileSync(file, svg);
+console.log(`SVG -> ${file} (${(svg.length / 1024).toFixed(0)} KB)`);