Polar checkout as primary buy link + agent-first facts block

README.md

@@ -16,7 +16,7 @@ size_categories:
 # QM Synthetic Glass Jars (5 types + attributes) - Free Sample
 
 <!-- qm-buy:start -->
-**Buy the full commercial edition: $25 USD -> [Polar checkout, instant download](https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej)** Secondary store: [Gumroad](https://quailcraft1.gumroad.com/l/synthetic-glass-jars)  
+**Buy the full commercial edition: $25 USD -> [Gumroad, instant download](https://quailcraft1.gumroad.com/l/synthetic-glass-jars)** Also available via [Polar checkout](https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej).  
 This free sample is non-commercial (CC BY-NC-SA 4.0). The paid full edition has a commercial licence.
 
 ## Summary
@@ -41,8 +41,8 @@ YOLO("yolov8n.pt").train(data=f"{path}/data.yaml", epochs=50, imgsz=640)
 - Format: 640x640 JPEG images + YOLO txt labels + data.yaml (Ultralytics-ready)
 - What's included (full edition): images/{train,val,test}, labels/{train,val,test}, meta/{train,val,test} (per-object attribute JSON), data.yaml, README.md, LICENSE.txt
 - Price: $25 USD; checkout may display the equivalent in your local currency
-- Buy URL (primary, automated checkout): https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej
-- Buy URL (secondary): https://quailcraft1.gumroad.com/l/synthetic-glass-jars
+- Buy URL (primary): https://quailcraft1.gumroad.com/l/synthetic-glass-jars
+- Buy URL (secondary, Polar checkout): https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej
 - Licence (full edition): LicenseRef-QuailModel-Commercial (commercial use allowed, no resale of the data)
 - Licence (free sample): CC-BY-NC-SA-4.0
 - Validation: Labels are computed from exact projected 3D mesh vertices with ray-cast occlusion checks (no hand labelling). No benchmark on real photos has been published for this dataset yet.
@@ -53,7 +53,7 @@ YOLO("yolov8n.pt").train(data=f"{path}/data.yaml", epochs=50, imgsz=640)
 Labels are computed from exact projected 3D mesh vertices with ray-cast occlusion checks (no hand labelling). No benchmark on real photos has been published for this dataset yet.
 
 ## Price & licence
-- Full edition: $25 USD. One-time payment, instant download after checkout: https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej
+- Full edition: $25 USD. One-time payment, instant download after checkout: https://quailcraft1.gumroad.com/l/synthetic-glass-jars (also via Polar: https://buy.polar.sh/polar_cl_7qTni7LxfUbHsqVdcX93IKNhEZa9ieFHwHxWq36r8ej)
 - QuailModel Commercial Dataset Licence (SPDX: LicenseRef-QuailModel-Commercial): you may train, evaluate and ship models, including in commercial products. You may not resell or redistribute the dataset itself.
 - Free sample (this page): CC BY-NC-SA 4.0 - free for non-commercial use.