added stock fish for move eval in uchess

shell.nix

@@ -1,7 +1,7 @@
 {pkgs ? import <nixpkgs> {}}:
 with pkgs;
   mkShell rec {
-    packages = [gdb zls uchess cutechess];
+    packages = [gdb zls uchess cutechess stockfish];
     nativeBuildInputs = [
       zig
     ];

uchess.json

@@ -5,12 +5,12 @@
     "uciEngines": [
 	{
 	    "name":"rat",
-	    "engine":"./a.out",
+	    "engine":"./zig-out/bin/RatChess",
 	    "ponder":false
 	},
         {
             "name": "stockfish",
-            "engine": "/nix/store/5d7aqjdak73qlsimiismbj0m1h9b566j-stockfish-17/bin/stockfish",
+	    "engine": "/nix/store/xrzjqi5m9yphj4p5wgpvnamxs38ap0wv-stockfish-17/bin/stockfish",
             "hash": 128,
             "ponder": false,
             "ownBook": false,