Move JET to separate nopre test environment

- Create test/nopre/Project.toml with JET dependency
- Update runtests.jl to activate nopre environment for JET tests
- Remove JET from main Project.toml test dependencies

This fixes the pre-release Julia CI failures by isolating JET (which
doesn't support pre-release Julia) into its own test environment.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: claude

.github/workflows/Tests.yml

@@ -31,11 +31,6 @@ jobs:
           - "Downstream"
           - "nopre"
         exclude:
-          # JET is a test dependency that doesn't support pre-release Julia
-          - version: "pre"
-            group: "Core"
-          - version: "pre"
-            group: "Downstream"
           - version: "pre"
             group: "nopre"
     uses: "SciML/.github/.github/workflows/tests.yml@v1"

Project.toml

@@ -50,7 +50,6 @@ DocStringExtensions = "0.9.3"
 FastBroadcast = "0.3.5"
 ForwardDiff = "0.10.38, 1"
 GPUArraysCore = "0.2"
-JET = "0.9, 0.11"
 KernelAbstractions = "0.9.36"
 LinearAlgebra = "1.10"
 Measurements = "2.11"
@@ -80,7 +79,6 @@ julia = "1.10"
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 FastBroadcast = "7034ab61-46d4-4ed7-9d0f-46aef9175898"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
-JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
 KernelAbstractions = "63c18a36-062a-441e-b654-da1e3ab1ce7c"
 Measurements = "eff96d63-e80a-5855-80a2-b1b0885c5ab7"
 MonteCarloMeasurements = "0987c9cc-fe09-11e8-30f0-b96dd679fdca"
@@ -99,4 +97,4 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [targets]
-test = ["Aqua", "FastBroadcast", "ForwardDiff", "JET", "KernelAbstractions", "Measurements", "NLsolve", "Pkg", "Random", "SafeTestsets", "SciMLBase", "SparseArrays", "StaticArrays", "Statistics", "StructArrays", "Tables", "Test", "Unitful", "Zygote"]
+test = ["Aqua", "FastBroadcast", "ForwardDiff", "KernelAbstractions", "Measurements", "NLsolve", "Pkg", "Random", "SafeTestsets", "SciMLBase", "SparseArrays", "StaticArrays", "Statistics", "StructArrays", "Tables", "Test", "Unitful", "Zygote"]

test/nopre/Project.toml

@@ -0,0 +1,6 @@
+[deps]
+JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[compat]
+JET = "0.9, 0.10, 0.11"

test/runtests.jl

@@ -17,6 +17,12 @@ function activate_gpu_env()
     return Pkg.instantiate()
 end
 
+function activate_nopre_env()
+    Pkg.activate("nopre")
+    Pkg.develop(PackageSpec(path = dirname(@__DIR__)))
+    return Pkg.instantiate()
+end
+
 @time begin
     if GROUP == "Core" || GROUP == "All"
         @time @safetestset "Quality Assurance" include("qa.jl")
@@ -58,6 +64,7 @@ end
     end
 
     if GROUP == "nopre"
+        activate_nopre_env()
         @time @safetestset "JET Tests" include("jet_tests.jl")
     end
 end