Enzyme tests disabled on Julia 1.12+ due to compatibility issues

[ChrisRackauckas-Claude]

Problem

Enzyme derivative rule tests are currently disabled on Julia 1.12+ due to compatibility issues between Enzyme and the Julia 1.12 runtime.

Current Workaround

Tests are conditionally disabled in test/runtests.jl:

# Disable Enzyme tests on Julia >= 1.12 due to compatibility issues
if VERSION < v"1.12.0-"
    @time @safetestset "Enzyme Derivative Rules" include("nopre/enzyme.jl")
end

Action Items

• Monitor Enzyme.jl for Julia 1.12 compatibility updates
• Re-enable tests once Enzyme supports Julia 1.12
• Verify all Enzyme derivative rules still work correctly

Related

• Part of PR Fix type inference issue in LinearCache initialization with LinearVerbosity #814 which fixed type inference issues
• Tests pass on Julia 1.10 and 1.11
• Need to track when Enzyme.jl adds Julia 1.12 support

References

• Enzyme.jl repository: https://github.com/EnzymeAD/Enzyme.jl
• Related issues in Enzyme.jl about Julia 1.12 compatibility should be linked here

cc @ChrisRackauckas