Reword subset-download lead-in

Fold size unit into table headers

Remove runtime CLIP-backbone note

Drop CLIP note now covered by requirements.txt

FreqDetect works with defaults; drop override note

Model card: drop the three removed checkpoints

Drop redundant --ckpt from detector table

Trim model card prose

Model card: use decimal size units to match Hub display

Add SIDBench pretrained detector weights (34 files) and model card