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IntegrationTest: PDESystemLibrary 412/427 tests fail with Pair conversion error #516

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@ChrisRackauckas-Claude

The PDESystemLibrary downstream integration tests fail with: MethodError: Cannot convert an object of type Pair{Symbolics.Num, Float64} to an object of type SymbolicUtils.Symbolic. The error occurs during mtkcompile -> TearingState when processing the discretized system. Stack trace shows the Pair is being pushed into a Set{SymbolicUtils.Symbolic}. Only 15 of 427 tests pass (mostly stationary PDEs like sph, adv, diff, gen, bruss). All time-dependent convection/diffusion examples fail. The IntegrationTest is set to continue-on-error in PR #513.

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