Run Runic formatter on the repository

[ChrisRackauckas-Claude]

Please ignore until reviewed by @ChrisRackauckas. Draft.

Runs the Runic.jl v1 formatter over the repository so the format-check CI (the centralized SciML/.github/.github/workflows/runic.yml@v1 reusable workflow, fredrikekre/runic-action@v1) passes.

Change

The only change is in test/runtests.jl: a let ... end one-liner (introduced in #93) expanded to multi-line form. This is what currently makes format-check red on master.

-const GROUP = let g = get(ENV, "GROUP", "all"); isempty(g) ? "all" : g end
+const GROUP = let g = get(ENV, "GROUP", "all")
+    isempty(g) ? "all" : g
+end

Formatting-only and semantically identical. The other 13 tracked .jl files were already Runic-clean.

Verification (clean-room, independent fresh clones)

• CI parity: fresh depot + fresh Runic v1.7.0 (the version runic-action@v1 resolves), runic --check over git ls-files '*.jl' (14 files) → exit 0, no diff. CI format-check will pass.
• Semantic identity: only test/runtests.jl differs from master; the const GROUP value is identical for GROUP unset/""/"all"/"core"/"QA"; and Meta.parseall with LineNumberNodes stripped compares AST-equal between the two versions.
• Tests: full suite on the formatted tree (Julia 1.10) → 184 pass / 0 fail, Pkg.test exit 0 (ModelingToolkit DAE Initialization 46/46, Testing common interface 4/4, QA 20/20).

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