Function solve_resolved_isotropic_elasticity_cartesian_2d 

pub fn solve_resolved_isotropic_elasticity_cartesian_2d(
    program: &KernelProgram,
    resolved: &ResolvedRealization,
    backend: &dyn LinearSolverBackend,
) -> Result<(IsotropicElasticityCartesianModel2d, CartesianLinearElasticity2dSolution), Diagnostic>

Execute one exact resolved Q1 plan against canonical 2D elasticity.

The Semantic Model supplies only physical meaning. Cell count, Q1 space, Gauss rule, solver plan, and execution target must already have crossed the typed Realization capability gate.

Errors

Returns EQ0807 when provenance or the plan differs from the verified reference envelope, and preserves lowering, assembly, and solver failures.