fix: remove START prints and emoji prints from train_agent, convert to STEP format

inference.py

@@ -323,7 +323,7 @@ def train_agent(num_episodes: int = 10) -> AgentState:
         agent_state = AgentState()
         all_episodes = []
         
-        print(f"START: RL training for {num_episodes} episodes with model: {MODEL_NAME}")
+        print(f"STEP: RL training started - episodes={num_episodes} model={MODEL_NAME}")
         logger.info(f"[TRAINING START] Starting RL training for {num_episodes} episodes with model: {MODEL_NAME}")
         
         # RUN BASELINE FIRST
@@ -366,7 +366,7 @@ def train_agent(num_episodes: int = 10) -> AgentState:
                 break
         
         # PERFORMANCE COMPARISON
-        print("START: Training summary analysis")
+        print("STEP: Training summary analysis")
         logger.info(f"\n{'='*60}")
         logger.info(f"[TRAINING SUMMARY]")
         logger.info(f"{'='*60}")
@@ -388,17 +388,13 @@ def train_agent(num_episodes: int = 10) -> AgentState:
             
             # Performance classification
             if improvement > 50:
-                print("🚀 EXCELLENT: Significant improvement over baseline!")
-                logger.info("🚀 EXCELLENT: Significant improvement over baseline!")
+                print("STEP: EXCELLENT - significant improvement over baseline")
             elif improvement > 20:
-                print("✅ GOOD: Measurable improvement achieved")
-                logger.info("✅ GOOD: Measurable improvement achieved")
+                print("STEP: GOOD - measurable improvement achieved")
             elif improvement > 0:
-                print("📈 POSITIVE: Some improvement over baseline")
-                logger.info("📈 POSITIVE: Some improvement over baseline")
+                print("STEP: POSITIVE - some improvement over baseline")
             else:
-                print("⚠️  NO IMPROVEMENT: RL agent not better than baseline")
-                logger.info("⚠️  NO IMPROVEMENT: RL agent not better than baseline")
+                print("STEP: NO IMPROVEMENT - RL agent not better than baseline")
         
         return agent_state