# Sprint Contract: Linear Static Workflow

## Objective
Rebuild or verify the full linear static workflow from parsed `Domain` to `AnalysisModel`, `AnalysisState`, solve, `U` and `RF` result fields.

## Required Reading
- /AGENTS.md
- /docs/ARCHITECTURE.md
- /docs/ADR.md
- /docs/RESULTS_SCHEMA.md
- /docs/NUMERICAL_CONVENTIONS.md
- /docs/MITC4_FORMULATION.md

## Scope
- Build the active `AnalysisModel` for one linear static step.
- Run the template workflow: build DOF map, assemble, apply constraints, solve, reconstruct full vectors, recover RF, write results.
- Keep `Domain` immutable and `AnalysisState` mutable.

## Allowed Files
- `include/`
- `src/`
- `tests/`
- `PLAN.md`
- `PROGRESS.md`

## Explicit Non-Goals
- Do not implement nonlinear, dynamic, pressure, or thermal behavior.
- Do not add multiple-step execution unless already trivial and tested.
- Do not make HDF5 dependency mandatory if the current minimal writer remains the accepted Phase 1 path.

## Tests To Write First
- Input-to-analysis-model activation test.
- End-to-end small linear static solve with `U` and `RF`.
- Result schema field label and frame tests.
- Full-vector reaction balance test.
- Missing/unsupported input negative tests routed through the workflow.

## Reference Artifacts
- Normalized small `.inp` fixtures may be used.
- Stored Abaqus CSV regression is reserved for step 14.

## Acceptance Commands
```bash
python scripts/validate_workspace.py
```

## Evaluator Checklist
- Workflow follows architecture boundaries.
- `AnalysisState` owns mutable vectors.
- Results use documented step/frame/field structure.

## Handoff Requirements
- Record end-to-end workflow readiness in `PROGRESS.md`.

## Do Not
- Do not bypass validators to make a model solve.