Added Lessons learned from rewriting the UltraGraph crate to Observations/Thoughts section. (#6906)

Signed-off-by: Marvin Hansen <[email protected]>
Co-authored-by: Ben Dillon <[email protected]>

Author: marvin-hansen

draft/2025-08-20-this-week-in-rust.md

@@ -47,6 +47,7 @@ and just ask the editors to select the category.
 
 ### Observations/Thoughts
 
+* [Lessons learned from rewriting the UltraGraph crate](https://deepcausality.com/blog/lessons-learned-from-rewriting-ultragraph) 
 * [Scientific Computing in Rust](https://ideas.reify.ing/en/blog/scientific-computing-in-rust-with-pytorch/)
 
 ### Rust Walkthroughs