Canonical CI: grouped-tests.yml + root test/test_groups.toml

[ChrisRackauckas-Claude]

Converts the root test workflow to the canonical SciML thin caller using SciML/.github grouped-tests.yml@v1, with the test matrix declared once in test/test_groups.toml.

Changes

• .github/workflows/Tests.yml — now a thin caller of grouped-tests.yml@v1 (secrets: inherit, no with: needed: defaults match — GROUP env name, check-bounds: yes, coverage on, src,ext dirs). name:, on:, and concurrency: preserved verbatim. No other workflows touched.
• test/test_groups.toml (new) — root matrix. The functional suite is split into two groups solely to reproduce the old non-uniform matrix exactly:
  • [Core] version "1" on ubuntu-latest, windows-latest, macOS-15-intel, macOS-latest
  • [CoreLTSPre] versions lts, pre on ubuntu-latest
  • [QA] versions lts, 1
• test/runtests.jl — adds GROUP dispatch. Every non-QA group runs the full existing functional suite; QA runs the QA file.
• test/qa/ (new) — isolated QA environment (Aqua, JET, Test, Evolutionary via [sources] path) and qa.jl running Aqua.test_all(Evolutionary) + JET.test_package(Evolutionary; target_defined_modules=true).

Matrix match (verified statically via compute_affected_sublibraries.jl --root-matrix)

Old Tests.yml matrix:

• 1 × {ubuntu-latest, windows-latest, macOS-15-intel, macOS-latest}
• lts × {ubuntu-latest}
• pre × {ubuntu-latest}

Emitted functional cells are byte-for-byte the same 6-cell set. arch is auto-detected from each runner (aarch64 on macOS-latest, x64 elsewhere), matching the old include arch axis. The QA group (QA/lts, QA/1 on ubuntu-latest) is newly added.

Notes

• QA group newly wired; Aqua/JET run in CI — any failures will be triaged in follow-up.
• Project metadata: [compat] julia already "1.10" (LTS floor); all [extras] deps already have [compat] entries — no changes needed.
• Structural conversion only; tests/Aqua/JET were not run locally. TOML + YAML parse and the matrix computation were verified statically.

Ignore until reviewed by @ChrisRackauckas.