Add a blog post for the 2026 JuMP-dev prize (#202)

Author: odow

_posts/2026-06-02-prize_2026.md

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+---
+layout: post
+title:  "JuMP-dev prize 2026"
+date:   2026-05-02
+categories: [jump-dev-prize]
+author: "Oscar Dowson, Joaquim Garcia, Benoît Legat, and Miles Lubin"
+permalink: prize/jump-dev-2026
+---
+
+We are pleased to announce the winners of the 2025 JuMP-dev prize.
+Continuing our tradition started in [2025](/prize/jump-dev-2025), this year's
+prize is a jump rope. The prize committee consisted of Oscar Dowson, Joaquim
+Garcia, Benoît Legat, and Miles Lubin.
+
+This year there are two winners:
+
+ * Daniel Nguyen, for his engaging talk "DisjunctiveProgramming.jl’s New Suite
+   of Solution Methods."
+
+ * Sophie Lequeu, for her talk "Adding array support for JuMP’s Automatic
+   Differentiation" and for her work on ArrayDiff.jl, which is an experimental
+   library that adds vector-valued automatic differentiation (AD) to JuMP.
+   Support for vector-valued nonlinear functions is one of the oldest and
+   most-frequently requested features in JuMP, and we look forward to a future
+   pull request that makes this an official feature!
+
+Congratulations, and happy JuMPing!
+
+<img src="/assets/jump-dev-workshops/2026/jump-prize.jpg" alt="Photo of winning presenters of JuMP-dev 2026">