feat: port quality, escalation, KB version, site-map KB, experiments and metrics

bridge/test/experiments.test.js

@@ -0,0 +1,10 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { createExperimentManager } = require('../src/experiments');
+
+test('experiments: no config returns no variant', () => {
+  const m = createExperimentManager({ experimentsPath: '/nonexistent.json' });
+  assert.equal(m.getVariant('c1').variant, null);
+});