Feature: Implement device ID assignment utility and apply it to build processes

tests/ableton-hybrid.test.ts

@@ -1,5 +1,6 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
+import { assignDeviceListIds } from '../src/lib/exporters/ableton/builders';
 import abletonTransformer, { AblTrack, getDrumRackMidiNote } from '../src/lib/transformers/ableton';
 import {
   EffectType,
@@ -144,6 +145,15 @@ function trackShape(tracks: AblTrack[]) {
   }));
 }
 
+test('assigns IDs to every device-list member, including nested rack devices', () => {
+  const devices = [{ OriginalSimpler: {} }, { AutoFilter: {} }];
+
+  assignDeviceListIds(devices);
+
+  assert.equal(devices[0].OriginalSimpler['@Id'], 0);
+  assert.equal(devices[1].AutoFilter['@Id'], 1);
+});
+
 test('automatically builds a per-group rack without flattening chromatic pads', () => {
   const result = abletonTransformer(project(), {
     includeArchivedSamples: true,