QA: run_qa v1.6 form + ExplicitImports

[ChrisRackauckas-Claude]

Ignore until reviewed by @ChrisRackauckas.

Brings Evolutionary.jl's QA onto the SciMLTesting 1.6 run_qa form with ExplicitImports enabled. Verified locally against the released SciMLTesting 1.6.0 (Pkg resolves it; no dev-from-branch).

What changed

• test/qa/qa.jl: hand-rolled Aqua.test_all + JET body → run_qa(Evolutionary; explicit_imports = true, ...).
• test/qa/Project.toml: drop Aqua/JET/SafeTestsets (now transitive via SciMLTesting); bump SciMLTesting compat floor to 1.6.
• src/Evolutionary.jl: make the implicit LinearAlgebra/Statistics/StackViews imports explicit (the no_implicit_imports fix).

ExplicitImports findings (6 checks)

• no_implicit_imports — FIXED. Converted using LinearAlgebra, Statistics + using StackViews to using LinearAlgebra: Diagonal, Symmetric, diag, diagm, eigen!, norm, using Statistics: mean, using StackViews: StackView. The names rank/tr/var that EI also reported are shadowed by local bindings (a nested function rank, a tr function parameter, a var tuple-unpack local), not genuine uses of LinearAlgebra.rank/tr/Statistics.var, so they are intentionally not imported. Core functional suite re-run green to confirm no runtime breakage.
• no_stale_explicit_imports — passes.
• all_explicit_imports_via_owners / all_qualified_accesses_via_owners / all_qualified_accesses_are_public — pass.
• all_explicit_imports_are_public — IGNORE the three other-package non-public names via ei_kwargs (they go public as the base libs declare them):
  • default_rng (Random, stdlib non-public)
  • nconstraints, nconstraints_x (NLSolversBase non-public)

Preserved tracked-broken findings (issue #145)

• Aqua ambiguities (18), unbound_args (3), piracies (7) → aqua_broken (tracked, QA: Aqua/JET findings marked @test_broken pending fix #145).
• JET → kept as a static @test_broken placeholder rather than jet_broken = true. The JET report findings (+(::Nothing,::Int), kwcall on SPX/deprecated aliases, Evolutionary.expr) surface only on Julia >= 1.12 (the QA 1 lane); the LTS lane (1.10/1.11) is clean. jet_broken = true would auto-flag an Unexpected-Pass Error on the clean LTS lane, and a hard JET check would fail the 1 lane — so a static tracked placeholder is the only form correct across the ["lts", "1"] matrix. Tracked in QA: Aqua/JET findings marked @test_broken pending fix #145.

Local verification (released SciMLTesting 1.6.0)

QA group via GROUP=QA Pkg.test, both lanes:

Julia	Pass	Broken	Fail	Error
1.10 (lts)	14	4	0	0
1.12 (1)	14	4	0	0

Aqua enabled sub-checks (8 pass): undefined exports, project-extras, stale deps, compat bounds (4), persistent tasks. ExplicitImports: 6 pass. The 4 broken = 3 Aqua placeholders + 1 JET placeholder.

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