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

[ChrisRackauckas-Claude]

Summary

Converts the root Tests.yml workflow into the canonical thin caller of SciML/.github grouped-tests.yml@v1, with the group × version matrix declared once in test/test_groups.toml (no more hand-maintained matrix in the workflow). on: and concurrency: are preserved verbatim; name: "Tests" and the filename are unchanged. Linux-only (no os field). No with: block is needed — all inputs use their defaults (group-env-name: GROUP, check-bounds: yes, coverage: true, coverage-directories: src,ext).

Category B refactor (inline Aqua/JET → isolated QA group)

Previously the quality checks ran inline:

• Aqua + ExplicitImports in the Core group (across all versions),
• JET in a separate nopre group (lts, 1), with Pkg.add("JET") at runtime.

They are now consolidated into an isolated QA group:

• test/qa/Project.toml — [deps] Aqua / ExplicitImports / JET / Test + RootedTrees via [sources] path = "../.."; [compat] julia = "1.10".
• test/qa/qa.jl — holds the Aqua / ExplicitImports / JET checks verbatim (including the pre-existing getindex ambiguity and Requires stale-dep exclusions). The old test/jet_tests.jl is folded in and removed.
• runtests.jl — GROUP=Core runs the functional suite in the default test env; GROUP=QA does Pkg.activate(test/qa) + Pkg.develop(repo root) + Pkg.instantiate() then includes qa.jl; GROUP=all (local default) runs both.

Matrix match

The emitted (group, version) set from compute_affected_sublibraries.jl --root-matrix reproduces the old matrix exactly (the nopre JET group is renamed to the canonical QA group; identical version coverage):

Old	New
(Core, 1)	(Core, 1)
(Core, lts)	(Core, lts)
(Core, pre)	(Core, pre)
(nopre, 1)	(QA, 1)
(nopre, lts)	(QA, lts)

5 cells in both; all ubuntu-latest.

Project metadata

Root Project.toml already had julia = "1.10" (LTS floor) and a [compat] entry for its only [extras] dep (Plots), so no metadata changes were required.

Notes

• The QA group is newly wired through CI; Aqua/JET run in CI — any failures there will be triaged in a follow-up. No tests or checks were skipped, silenced, or excluded as part of this conversion.
• This is a structural conversion; tests/Aqua/JET were not run locally (TOML/YAML parse + matrix computation were verified statically).

Ignore until reviewed by @ChrisRackauckas.

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