FESADev/.codex/skills/fem-io-contract/SKILL.md

name, description

name	description
fem-io-contract	Define supported structural solver input semantics, diagnostics, result schema, and deterministic comparison mapping.

FEM I/O Contract

Specify the assigned supported input subset, syntax and semantics, validation/diagnostics, source-label preservation, units, coordinates, components, internal mapping, authoritative output schema, and deterministic comparison projection. Unsupported meaningful semantics fail closed unless an explicit approved warning policy applies.

Use public Abaqus material only for observable convention. State any supported difference; do not infer private parser, data model, algorithm, or output-database behavior. A compatibility or authoritative-schema change is a user decision when it changes the public contract. Return the contract and open gaps; do not select physics, tolerances, implementation, or alter reference artifacts.