Update app.py

Fixed gemini API key variable

app.py

@@ -10,7 +10,7 @@ from google.genai.types import GoogleSearch
 # (Keep Constants as is)
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
-GEMINI_API_KEY = os.get("Gemini_API_key")
+GEMINI_API_KEY = os.getenv("Gemini_API_key")
 
 # --- Basic Agent Definition ---
 # Agent capabilities required: Search the web, listen to audio recordings, watch YouTube videos (process the footage, not the transcript), work with Excel spreadsheets