Add Maelstrom v0.13 (#6436)

Author: nfachan

draft/2025-03-05-this-week-in-rust.md

@@ -47,6 +47,8 @@ and just ask the editors to select the category.
 
 * [memberlist 0.6 - gossip protocol for cluster membership management](https://github.com/al8n/memberlist/releases/tag/v0.6)
 
+* [Maelstrom Clustered Test Runner v0.13: new watch mode and GitHub workflow support](https://maelstrom-software.com/blog/0.13.0/)
+
 ### Observations/Thoughts
 * [The problem with type aliases](https://blog.polybdenum.com/2025/03/01/the-problem-with-type-aliases.html)
 * [Take a break: Rust match has fallthrough](https://huonw.github.io/blog/2025/03/rust-fallthrough/)