Point the section 3 citation at the Zenodo deposit

The card cited COSMOS_Paper.md for the architecture's central equation, and that file is not in this repository -- the one citation a reader most needs did not resolve. It now points at the deposited DOI, and says plainly that the paper is not redistributed here.

README.md

@@ -246,7 +246,9 @@ component. The CC BY 4.0 licence on this repository covers the author's own work
 
 ## 2. Mixture-of-States Hebbian Attention (the architecture's actual contribution)
 
-From `COSMOS_Paper.md` §3, attention where a 54-dimensional internal state modulates the attention matrix itself:
+From §3 of the Cosmic Synapse Theory paper — deposited at
+[10.5281/zenodo.17574447](https://doi.org/10.5281/zenodo.17574447), not redistributed here —
+attention where a 54-dimensional internal state modulates the attention matrix itself:
 
 ```
 H(x₅₄)ᵢⱼ = exp( −‖x₅₄ᵢ − x₅₄ⱼ‖² / 2σ² )        Gaussian kernel over 54D states