docs: add demo video link

README.md

@@ -64,8 +64,8 @@ cached scan so the full animation is testable on a laptop.
 
 ## Submission
 
-- **Demo video:** <!-- paste the YouTube / uploaded video link here -->
-- **Social post:** <!-- paste the X / LinkedIn post link here -->
+- **Demo video:** https://youtu.be/kVkX3Dg5gOg
+- **Social post:** https://x.com/barathishere/status/2066882090054930704
 
 ### Badges claimed