Drop misleading long-form override section (duration is auto-estimated)

README.md

@@ -63,14 +63,6 @@ python src/inference.py \
     --cfg-scale 2.5 --stg-scale 1.5
 ```
 
-For **long-form** generation (>20 s music or multi-section scenes), set the explicit target duration:
-
-```bash
-python src/inference.py --gen-duration 30 --prompt '...'   # CLI
-# or in Python:
-server.generate_to_file(prompt=..., gen_duration=30.0)
-```
-
 ## Inference parameters
 
 | Parameter | Default | What it does |