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test: restore now-supported gradient checks - #149

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ChrisRackauckas-Claude:codex/downgrade-scilmsensitivity-floor
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test: restore now-supported gradient checks#149
ChrisRackauckas-Claude wants to merge 1 commit into
SciML:mainfrom
ChrisRackauckas-Claude:codex/downgrade-scilmsensitivity-floor

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@ChrisRackauckas-Claude

@ChrisRackauckas-Claude ChrisRackauckas-Claude commented Aug 17, 2026

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Raise the minimum OptimizationOptimJL test dependency to the first release that provides the current SciMLBase.ReturnCode API, and remove two stale @test_broken markers that make the minimum-version DowngradeCI job fail on unexpected passes.

DowngradeCI now passes for the Core group:
https://github.com/SciML/ModelingToolkitNeuralNets.jl/actions/runs/32034141728/job/95400498217

The regular test matrix currently fails the same two gradient assertions after they are re-enabled, on both the latest and LTS Julia jobs. For example:

Those failures are reported explicitly rather than being hidden with a new skip or broken marker. The PR therefore establishes the correct downgrade behavior while leaving the current-stack numerical gradient issue visible for review.

No public API changes and no deprecation path is required.

Please ignore this PR until it has been reviewed by @ChrisRackauckas.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
@ChrisRackauckas-Claude

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Closing this draft: removing the existing broken assertions is not an acceptable DowngradeCI fix. The regular test failures are real and require a behavioral or dependency fix.

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