QA: run_qa v1.6 form + ExplicitImports (root + sublibs)

[ChrisRackauckas-Claude]

This PR should be ignored until reviewed by @ChrisRackauckas.

Converts the root QA env and all 7 lib/<Sub> sublibrary QA envs to the SciMLTesting 1.6 run_qa form with explicit_imports = true, in one branch.

Per QA env

• qa.jl → using SciMLTesting, <Module>, Test + run_qa(<Module>; explicit_imports = true, ...).
• test/qa/Project.toml: SciMLTesting [compat] bumped to "1.6"; Aqua kept (ambiguities is disabled in every env); ExplicitImports left as a transitive dep of SciMLTesting (not listed).
• The monorepo [sources] / develop wiring (sublib + umbrella-root pins, activate_group_env / develop_sources! <1.11 backport) is preserved exactly.

ExplicitImports: fixed, not suppressed (0 hard FAIL, no broken markers)

• no_implicit_imports — each sublibrary's blanket using <dep> is replaced with the explicit name list ExplicitImports recommends, e.g.
  • BV: using DiffEqBase: DiffEqBase, BVPFunction, BVProblem, using SpecialFunctions: SpecialFunctions, erf
  • ODE: using LinearAlgebra: LinearAlgebra, Diagonal, I, SymTridiagonal, diagind, ldiv!, mul!, rmul!, etc.
  • Jump: using Catalyst: Catalyst, @reaction_network, @species, @parameters, @named, Num, Reaction, ReactionSystem, complete, default_t, hill, make_empty_network, species, unknowns
• all_qualified_accesses_are_public — JumpProblemLibrary and SDEProblemLibrary call the non-public RuntimeGeneratedFunctions.init (the documented RGF init boilerplate), so :init is added to that check's ignore list.
• All 6 EI checks pass on every env after the fixes.

Genuine Aqua disables preserved

• ambiguities = false in every env (including the root — its only ambiguities come from the imported dependency tree, since the umbrella owns no methods).
• persistent_tasks = false for JumpProblemLibrary and SDEProblemLibrary.

Root package Project.toml

• Add the missing Pkg [compat] entry (Aqua deps_compat extras check flagged it once Aqua started running on the root).
• Bump SciMLTesting [compat] to "1.6".

Sublibs converted

BVProblemLibrary, DAEProblemLibrary, DDEProblemLibrary, JumpProblemLibrary, NonlinearProblemLibrary, ODEProblemLibrary, SDEProblemLibrary (7) + root.

Verification (Julia 1.11, released SciMLTesting 1.6.0)

• Root QA: Quality Assurance | 16 pass / 16 total (Aqua incl. persistent_tasks + deps_compat after the Pkg fix; ExplicitImports 6/6).
• Each sublibrary: all 6 ExplicitImports checks pass (verified BV/DAE/DDE/NLP/ODE/SDE individually; Jump verified with the explicit-Catalyst fix + init ignore). Aqua per sublib unchanged from the prior hand-rolled call.
• Runic clean; typos clean.

🤖 Generated with Claude Code