docs: cite Yatsenko & Nguyen 2026 preprint in relational workflow model

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dimitri-yatsenko

src/explanation/relational-workflow-model.md

@@ -5,8 +5,10 @@ relational databases with native support for computational workflows. This model
 defines a new class of databases called **Computational Databases**, where
 computational transformations are first-class citizens of the data model.
 
-These concepts, along with DataJoint's schema definition language and query algebra,
-were first formalized in [Yatsenko et al., 2018](https://doi.org/10.48550/arXiv.1807.11104).
+The relational workflow model and computational databases are formally defined in
+[Yatsenko & Nguyen, 2026](https://arxiv.org/abs/2602.16585). DataJoint's schema
+definition language and query algebra were first formalized in
+[Yatsenko et al., 2018](https://doi.org/10.48550/arXiv.1807.11104).
 
 ## The Problem with Traditional Approaches