test: use consistent JIT variants in solver invariants

[sylvesterkaczmarek]

PR Type

• Tests

Description

Ensures solver invariant checks recompute solver results with the same JIT variant used for the result under test.

The JIT wrapper is now threaded through check_solution_invariants and its overrides, including padding-invariance and recombination-specific recomputations. This avoids comparing a JIT-produced coreset against a separately recomputed non-JIT result, which can differ slightly across devices.

Closes #1067.

How Has This Been Tested?

• uv run pytest tests/unit/test_solvers.py — 414 tests passed
• uv run pre-commit run --files tests/unit/test_solvers.py CHANGELOG.md — all hooks passed, including ruff, pyright, pylint, cspell and copyright checks
• git diff --check

Existing parametrised tests pass for both JIT and non-JIT variants.

Does this PR introduce a breaking change?

No. This only changes test infrastructure and the changelog.

Checklist before requesting a review

• I have made sure that my PR is not a duplicate.
• My code follows the style guidelines of this project.
• I have ensured my code is easy to understand, including docstrings and comments where necessary.
• I have performed a self-review of my code.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have updated CHANGELOG.md, if appropriate.

[tm91236]

Thank you for the contribution, LGTM.

[sylvesterkaczmarek]

Thanks for the review and approval. Appreciate it.