# Sprint Contract: Module Scaffold And Facade

## Objective
Create the target module directory scaffold and public include facade policy so later steps can move code incrementally while preserving existing tests and user includes.

## Required Reading
- /AGENTS.md
- /PROGRESS.md
- /PLAN.md
- /docs/README.md
- /docs/HARNESS_ENGINEERING.md
- /docs/ARCHITECTURE.md
- /docs/ADR.md
- /phases/1-structure-alignment-refactor/step0-architecture-map.md

## Scope
- Add the documented module directories under `include/fesa/` and `src/` as needed, including `Analysis`, `Assembly`, `Boundary`, `Core`, `Element`, `IO`, `Load`, `Math`, `Material`, `Property`, `Results`, and `Util`.
- Update `CMakeLists.txt` so future `.cpp` files under the module directories are compiled by `fesa_core`.
- Keep `include/fesa/fesa.hpp` as the stable umbrella header for current tests and clients.
- Add minimal module header smoke coverage proving selected module headers and `fesa/fesa.hpp` can be included together.

## Allowed Files
- `CMakeLists.txt`
- `include/fesa/`
- `src/`
- `tests/`
- `phases/1-structure-alignment-refactor/index.json`
- `PLAN.md`
- `PROGRESS.md`

## Explicit Non-Goals
- Do not move large implementations yet.
- Do not change class names, namespaces, DOF order, result labels, parser behavior, or solver outputs.
- Do not add MKL, TBB, or HDF5 dependencies.
- Do not replace the umbrella header with module-only includes.

## Tests To Write First
- Add or update a compile/include smoke test that includes the new module headers and `fesa/fesa.hpp` together.
- The test should fail before the scaffold exists and pass after the scaffold is added.

## Reference Artifacts
- None.

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

## Evaluator Checklist
- Module directory names align with `docs/ARCHITECTURE.md`.
- `fesa_core` builds with the scaffold on Windows/MSVC.
- Existing tests still include `fesa/fesa.hpp` successfully.
- New module headers do not expose external MKL, TBB, or HDF5 APIs.
- No solver behavior changes are mixed into the scaffold.

## Handoff Requirements
- Update this step status in `phases/1-structure-alignment-refactor/index.json`.
- Record validation output and any CMake/source-list decisions in `PROGRESS.md`.
- Leave detailed code movement to later steps.

## Do Not
- Do not introduce broad formatting churn in `fesa.hpp`.
- Do not change public API semantics while creating empty or thin module boundaries.