Feature jacobians

[Hanquist]

Proposed Changes

Give a brief overview of your contribution here in a few sentences.

Trying to add Raghava's contributions for the Mutationpp Jacobian/implicit capabilities.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

[Copilot]

Pull Request Overview

This PR adds Jacobian/implicit capabilities for Mutation++ integration by updating the submodule reference and implementing new methods for computing chemistry and vibrational energy source term Jacobians. The changes enable implicit time stepping with Mutation++ fluid models in SU2.

• Updates Mutation++ submodule to a fork with Jacobian features
• Implements chemistry and vibrational energy source term Jacobian computation methods
• Removes the restriction preventing implicit time schemes with Mutation++ models

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
subprojects/Mutationpp	Updates submodule commit to include Jacobian features
meson_scripts/init.py	Updates Mutation++ repository URL and commit hash
SU2_CFD/src/numerics/NEMO/CNEMONumerics.cpp	Adds viscous Jacobian computation for 15-species case
SU2_CFD/src/fluid/CMutationTCLib.cpp	Implements Jacobian computation methods and removes implicit restriction
SU2_CFD/include/fluid/CMutationTCLib.hpp	Declares new Jacobian vectors and method signatures
Common/src/CConfig.cpp	Fixes gas model comparison and removes Mutation++ implicit restriction
.gitmodules	Updates Mutation++ submodule configuration to point to new fork

Comments suppressed due to low confidence (1)

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[Copilot]

Using SSH URL (git@github.com:) may cause issues for users without SSH keys configured. Consider using HTTPS URL (https://github.com/) for better accessibility.

Suggested change

	url = git@github.com:hypersonic-lab/Mutationpp.git
	url = https://github.com/hypersonic-lab/Mutationpp.git

[Copilot]

[nitpick] The comment format '//--modified by RSCD' doesn't follow standard commenting practices. Consider using a more descriptive comment explaining why the change was needed.

Suggested change

	monoatomic = StringToUpperCase(GetGasModel()) == "ARGON"; //--modified by RSCD
	monoatomic = StringToUpperCase(GetGasModel()) == "ARGON"; // Compare gas model to "ARGON" in a case-insensitive way for robustness.