Reorganise tests

[glesur]

• separate tests of specific IO routines from physics tests (XDMF and restart dumps)
• add all IO tests to github actions
• add Sedov to the test suite.

[Copilot]

Pull request overview

Reorganizes the test suite by separating IO-focused tests (restart dumps, XDMF, Pydefix) from physics tests, and updates CI to run the expanded test matrix (including Sedov).

Changes:

• Moved restart validation out of the OrszagTang3D physics test into a dedicated IO “dump” test.
• Added new IO tests for XDMF output and Pydefix, and wired them into GitHub Actions.
• Added Sedov blast wave to CI and adjusted some test tolerances/output cadence.

Reviewed changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/MHD/OrszagTang3D/testme.py	Removes restart validation from the physics regression test.
test/MHD/OrszagTang3D/setup.cpp	Removes restart-analysis logic from OrszagTang3D setup.
test/MHD/LinearWaveTest/testme.py	Adjusts tolerance for the linear wave test.
test/MHD/LinearWaveTest/idefix-entropy.ini	Increases log cadence for the entropy variant.
test/IO/xdmf/testme.py	Adds a new IO test driver intended to validate XDMF output.
test/IO/xdmf/setup.cpp	Adds minimal setup to generate a representative MHD state for XDMF dumps.
test/IO/xdmf/idefix.ini	Adds a config that enables XDMF + dump output for the new test.
test/IO/xdmf/definitions.hpp	Adds build definitions for the new XDMF IO test.
test/IO/pydefix/testme.py	Adds a new IO test covering Pydefix dump generation/regression.
test/IO/pydefix/python_requirements.txt	Adjusts pybind11 minimum version and adds a comment.
test/IO/pydefix/idefix.ini	Adjusts output cadence and enables dmp output for Pydefix test.
test/IO/dump/testme.py	Adds a dedicated restart-dump IO test driver.
test/IO/dump/setup.cpp	Adds restart validation analysis (moved from OrszagTang3D).
test/IO/dump/definitions.hpp	Adds build definitions for the new dump IO test.
test/IO/dump/CMakeLists.txt	Enables MHD property for the IO dump test target.
test/HD/SedovBlastWave/idefix.ini	Removes XDMF output from Sedov and tweaks output formatting.
test/HD/SedovBlastWave/CMakeLists.txt	Adds an MHD property line (in addition to HDF5).
src/setup.cpp	Suppresses default Setup warning when built with Python enabled.
src/pydefix.cpp	Marks some arrays as maybe_unused and prints Python runtime details at startup.
src/output/xdmf.cpp	Adds maybe_unused annotations to avoid warnings in some build modes.
reference	Updates submodule reference SHA.
CMakeLists.txt	Adds stricter HDF5 parallel checks under MPI and adds Python3/pybind11 CMake path setup.
.github/workflows/idefix-ci-jobs.yml	Adds Sedov + IO test job and includes LinearWaveTest in CI.

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