card: RF-DETR-Seg family

README.md

@@ -64,6 +64,16 @@ boxes = out["dets"].numpy()[0]                        # cxcywh, multiply by imag
 keep = scores > 0.5                                   # done — no NMS
 ```
 
+## RF-DETR-Seg (instance segmentation)
+
+`rfdetr-seg-{nano,small,medium,large,xlarge,2xlarge}_float32.aimodel` — same
+contract plus `masks [1, Q, R/4, R/4]`: per-query FULL-FRAME logit planes at
+stride 4 (host: sigmoid > 0.5; no ROI plumbing, no NMS). All six gate on CPU
+and GPU with binary-mask IoU 1.000 on stable scenes. M4 Max GPU:
+seg-nano 312² **10.7 ms** → seg-2xlarge 768² **59.1 ms**.
+
+<p align="center"><img src="demo_seg_coco_cats.jpg" width="440" alt="RF-DETR-Seg nano on Core AI"></p>
+
 ## Split deployment (`split/`)
 
 `split/rfdetr-{nano,medium}_{backbone,head}.aimodel` separate the pure-ViT