fix: replace console usage with logger, throw on unknown reactor type

Unknown reactor type is a configuration error that should fail loudly.
Converted console.log to logger.warn for unknown topics.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/nodeClass.js

@@ -57,7 +57,7 @@ class nodeClass {
                     break;
                 }
                 default:
-                    console.log("Unknown topic: " + msg.topic);
+                    this.source.logger.warn(`Unknown topic: ${msg.topic}`);
             }
 
             if (done) {
@@ -129,7 +129,7 @@ class nodeClass {
                 new_reactor = new Reactor_PFR(this.config);
                 break;
             default:
-                console.warn("Unknown reactor type: " + this.config.reactor_type);
+                throw new Error(`Unknown reactor type: ${this.config.reactor_type}`);
         }
 
         this.source = new_reactor; // protect from reassignment