Add one-line score visualizer with 3D orb and MP4 export

- Verovio single-system engraving, MuseScore audio/MIDI from the same source
- React + Remotion player with live camera, colour and orb controls
- Express pipeline, render queue and local H.264/AAC export
- MIT license plus third-party notices for the reference skill

scripts/props-from-job.ts

@@ -0,0 +1,44 @@
+import fs from 'node:fs';
+import {buildScrollKeys} from '../src/shared/scroll.js';
+import type {RenderData, VisualSettings} from '../src/shared/types.js';
+
+/** Builds Remotion still props for a finished job, using exactly its saved settings. */
+const id = process.argv[2];
+if (!id) throw new Error('usage: tsx scripts/props-from-job.ts <jobId> [outFile]');
+const out = process.argv[3] ?? 'data/check/p-job.json';
+
+const data = JSON.parse(fs.readFileSync(`data/jobs/${id}/score.json`, 'utf8')) as RenderData;
+const job = JSON.parse(fs.readFileSync(`data/jobs/${id}/job.json`, 'utf8')) as {
+  settings?: Partial<VisualSettings>;
+};
+const settings: VisualSettings = {...data.settings, ...(job.settings ?? {})};
+
+const displayHeight = settings.height * settings.scoreHeightRatio;
+const displayScale = displayHeight / Math.max(1, data.meta.svgHeight);
+const viewWidthScore = settings.width / displayScale;
+const maxLeft = Math.max(0, data.meta.svgWidth - viewWidthScore);
+const scroll = buildScrollKeys(
+  data.events,
+  settings.scrollLead,
+  viewWidthScore,
+  maxLeft,
+  data.meta.musicDuration,
+);
+
+fs.writeFileSync(
+  out,
+  JSON.stringify(
+    {
+      data: {
+        ...data,
+        settings,
+        scroll,
+        svgUrl: `http://127.0.0.1:3001/jobs/${id}/score.svg`,
+        audioUrl: `http://127.0.0.1:3001/jobs/${id}/audio.wav`,
+      },
+    },
+    null,
+    2,
+  ),
+);
+console.log(`${out}: ${settings.width}x${settings.height} tiltX=${settings.tiltX} tiltZ=${settings.tiltZ}`);