Add varied messaging experiments

tests/config.test.ts

@@ -227,7 +227,7 @@ describe('ConfigSchema', () => {
       expect(result.success).toBe(true);
       if (result.success) {
         expect(result.data.strategies.explorationRate).toBe(0.2);
-        expect(result.data.strategies.minSamples).toBe(30);
+        expect(result.data.strategies.minSamples).toBe(20);
         expect(result.data.strategies.responseWindowHours).toBe(12);
         expect(result.data.strategies.variants).toEqual([]);
         expect(result.data.chatStrategies.responseWindowHours).toBe(12);