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00e69548b9
The previous file duplicated a long narrative and many scenarios that better live
in basis/quadrature coverage; keep the Jacobian helpers exercised with tuple vs
vector coordinates and physical derivative consistency.
- SPDX header; drop unused `LinearAlgebra` import.
- Fix basis calls to `Triangle{3}` / `Lagrange{1}` and verify scaling + PoU gradient sum.