fix: restore all integration tests in main()

Co-authored-by: aider (deepseek/deepseek-reasoner) <aider@aider.chat>

tests/integration.c

@@ -1121,13 +1121,56 @@ int main(void) {
         return 1;
     }
 
+    /* 2. MIDI transition tests (skipped – no external tools) */
+
+    /* 3. Audio pass‑through test – must work for basic connectivity */
+    test_audio_pass_through();
+
     int failures = 0;
 
-    /* Only failing tests */
+    /* 4. Test that looping feature is now implemented */
+    if (test_looper_looping() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 5. Test multiple dynamic channels */
+    if (test_multiple_channels() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 6. Test control‑key modifier */
+    if (test_control_key_modifier() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 7. Test bind channel */
+    if (test_bind_channel() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 8. Test unbind */
+    if (test_bind_unbind() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 9. Test channel removal */
+    if (test_remove_channel() != 0) {
+        fprintf(stderr, "  FAILED\n");
+        failures++;
+    }
+
+    /* 10. Test WAV load */
     if (test_wav_load() != 0) {
         fprintf(stderr, "  FAILED\n");
         failures++;
     }
+
+    /* 11. Test WAV save */
     if (test_wav_save() != 0) {
         fprintf(stderr, "  FAILED\n");
         failures++;