Add JET tests for Newmark, RKIP, and SIMDRK packages

[ChrisRackauckas-Claude]

Summary

This PR adds JET.jl static analysis tests to the three OrdinaryDiffEq sub-packages that were missing them:

• OrdinaryDiffEqNewmark - Second-order ODE solvers using Newmark-Beta method
• OrdinaryDiffEqRKIP - Runge-Kutta-like integrating factor methods
• OrdinaryDiffEqSIMDRK - SIMD-optimized Runge-Kutta methods

Changes for each package:

• Created test/jet.jl with test_package typo checking using target_modules (the new API)
• Updated test/runtests.jl to include JET tests (only on stable Julia versions)
• Added JET to [extras], [compat], and [targets] sections in Project.toml
• JET compat is set to 0.9, 0.11 to match OrdinaryDiffEqCore

Testing

All JET tests pass locally with JET.jl v0.11:

• OrdinaryDiffEqSIMDRK: ✅ Convergence Tests (3/3), Adaptivity Tests (3/3), JET Tests (1/1)
• OrdinaryDiffEqRKIP: ✅ Type Safety Tests (105/105 + 45 broken), Cache Test (1/1), Fourier Semilinear PDE Tests (4/4), JET Tests (1/1)
• OrdinaryDiffEqNewmark: ✅ Harmonic Oscillator (2/2), Damped Oscillator (2/2), JET Tests (1/1)

Test plan

• CI passes for all three packages
• JET tests run successfully on Julia stable releases

cc @ChrisRackauckas

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