QA: run_qa v1.6 form + ExplicitImports

[ChrisRackauckas-Claude]

Ignore until reviewed by @ChrisRackauckas.

Brings this repo's QA group onto the SciMLTesting 1.6 run_qa form with ExplicitImports enabled. Converts the hand-rolled test/qa/qa.jl (manual Aqua.test_all + a JET report-count check) into a single declarative run_qa(...) call.

qa.jl

using SciMLTesting, MultiScaleArrays, JET
using Test
run_qa(MultiScaleArrays; explicit_imports = true,
    aqua_broken = (:ambiguities, :deps_compat),
    ei_kwargs = (; ...per-check ignore-lists...))

• Aqua + ExplicitImports come from SciMLTesting's own deps (not threaded in / not listed as test deps); JET is opted in via using JET.
• The two tracked-broken Aqua sub-checks (ambiguities, deps_compat; QA: Aqua/JET findings marked @test_broken pending fix #142) are preserved via aqua_broken — they are disabled in Aqua.test_all and emit @test_broken placeholders. No tracked-broken finding is lost.
• JET stays a hard check: the prior alg_needs_extra_process finding no longer fires, so JET passes (jet_broken not used).

ExplicitImports findings (preference FIX > IGNORE > BROKEN; 0 hard FAILs)

• no_stale_explicit_imports — FIXED: dropped unused Base imports /, print_matrix, vec (no method definitions for them; provably stale).
• no_implicit_imports — FIXED: made the 7 implicit imports explicit — using DiffEqBase: DiffEqBase, using LinearAlgebra: LinearAlgebra, ldiv!, using FiniteDiff: FiniteDiff, using Statistics: Statistics, using SciMLBase: full_cache, rand_cache (full_cache/rand_cache are owned + exported by SciMLBase, so imported from the owner).
• all_explicit_imports_via_owners — passes.
• all_qualified_accesses_via_owners / all_qualified_accesses_are_public / all_explicit_imports_are_public — IGNORED via ei_kwargs. These are other packages' non-owner / non-public names that become public as base libraries declare public. Grouped by source: Base.Broadcast (AbstractArrayStyle, Broadcasted, DefaultArrayStyle, _broadcast_getindex_eltype), DiffEqBase re-exports of SciMLBase (AbstractODEIntegrator, AbstractSDEIntegrator, DEIntegrator, is_diagonal_noise), ForwardDiff (DerivativeConfig, Dual, Tag), FiniteDiff (GradientCache, JacobianCache), OrdinaryDiffEqCore/Rosenbrock cache types, OrdinaryDiffEqDifferentiation (resize_grad_config!, resize_jac_config!), Base (tail, typename), RecursiveArrayTools (chain).

Deps

• test/qa/Project.toml: SciMLTesting compat → "1.6"; dropped ExplicitImports (transitive via SciMLTesting), Aqua (ambiguities disabled so the Aqua child-proc isn't needed; Aqua still loads transitively), SafeTestsets and Test (transitive / stdlib). Kept JET.
• root Project.toml: SciMLTesting compat → "1.6".

Verified locally (released SciMLTesting 1.6.0, Pkg-resolved; no dev-from-branch)

• QA group lts (1.10): 13 Pass, 2 Broken, 0 Fail/Error
• QA group "1" (1.11): 13 Pass, 2 Broken, 0 Fail/Error
• Core group (1.10): passes (import changes are behavior-preserving)

The 2 Broken are the aqua_broken placeholders for ambiguities + deps_compat (tracked in #142).

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