use qwen3 1.7b as optional model

summarize_transcript.py

@@ -86,7 +86,7 @@ def main():
                         help="Path to the input transcript file (default: ./transcripts/short.txt)")
     parser.add_argument("-m", "--model", type=str, 
                         default="unsloth/Qwen3-0.6B-GGUF:Q4_0", 
-                        help="HuggingFace model in format repo_id:quant (e.g., tiiuae/Falcon-H1-1.5B-Deep-Instruct-GGUF:Q4_0)")
+                        help="HuggingFace model in format repo_id:quant (e.g., unsloth/Qwen3-1.7B-GGUF:Q2_K_L)")
     parser.add_argument("-c", "--cpu", action="store_true", help="Force CPU only inference")
     args = parser.parse_args()