# Step 1: nonlinear-static-domain-contract

## 읽어야 할 파일

- `AGENTS.md`
- `docs/ARCHITECTURE.md`
- `docs/ADR.md`
- `docs/nonlinear-static-newton-raphson/requirements.md`
- `docs/nonlinear-static-newton-raphson/io.md`
- `docs/nonlinear-static-newton-raphson/reference-model.md`
- `docs/nonlinear-static-newton-raphson/implementation-plan.md`
- `include/fesa/model/model_types.h`
- `include/fesa/model/domain.h`
- `src/fesa/model/domain.cpp`
- `src/fesa/io/abaqus/step_definition_mapper.cpp`
- `src/fesa/io/abaqus/domain_mapping_context.h`
- `src/fesa/io/abaqus/domain_mapping_context.cpp`
- `tests/unit/model/model_types_test.cpp`
- `tests/unit/model/domain_test.cpp`
- `tests/unit/io/abaqus/domain_mapper_test.cpp`
- `tests/unit/io/abaqus/domain_mapping_components_test.cpp`
- Step 0 files: `include/fesa/app/output_paths.h`, `include/fesa/analysis/analysis.h`, `src/fesa/app/fesa_application.cpp`

## 이전 Step 전제

Step 0이 app-level path/log request fields를 만들었고 기존 linear invocation이 `<stem>_results.h5`를 사용한다.

## 소유 파일

- Modify: `include/fesa/model/model_types.h`
- Modify: `include/fesa/model/domain.h`
- Modify: `src/fesa/model/domain.cpp`
- Modify: `src/fesa/io/abaqus/step_definition_mapper.cpp`
- Modify: `src/fesa/io/abaqus/domain_mapping_context.h`
- Modify: `src/fesa/io/abaqus/domain_mapping_context.cpp`
- Test: `tests/unit/model/model_types_test.cpp`
- Test: `tests/unit/model/domain_test.cpp`
- Test: `tests/unit/io/abaqus/domain_mapper_test.cpp`
- Test: `tests/unit/io/abaqus/domain_mapping_components_test.cpp`

## 인터페이스

```cpp
namespace fesa {

enum class StaticProcedureKind {
  kLinearSmallDisplacement,
  kNonlinearFullNewton
};

struct StaticStepDefinition {
  std::string name;
  std::vector<PrescribedDisplacementDefinition> boundaries;
  std::vector<NodalLoad> loads;
  StaticProcedureKind procedure_kind;
  bool nlgeom;
  double initial_increment;
  double time_period;
  double minimum_increment;
  double maximum_increment;
  SourceLocation location;
};

class StepDefinition {
 public:
  StaticProcedureKind ProcedureKind() const noexcept;
  bool IsNonlinearStatic() const noexcept;
  double InitialIncrement() const noexcept;
  double TimePeriod() const noexcept;
  double MinimumIncrement() const noexcept;
  double MaximumIncrement() const noexcept;
};

}  // namespace fesa
```

Domain stores procedure identity and raw four `*STATIC` values only. Factor sequence is derived in Step 5. PRESELECT output requests are warning no-ops and do not create Domain, Analysis, or HDF5 state.

## RED

Add tests first.

- `NSNR-IO-001`: `*STEP, NLGEOM=YES` maps to `StaticProcedureKind::kNonlinearFullNewton`.
- `NSNR-IO-002`: `*STEP, NLGEOM=NO` maps to `kLinearSmallDisplacement` and existing shell linear tests keep passing.
- `NSNR-IO-003`: missing `NLGEOM` keeps current linear behavior.
- `NSNR-IO-004`: nonlinear `*STATIC` requires four finite positive values and time period exactly `1.0`.
- `NSNR-IO-005`: raw values are preserved in `StepDefinition` without derived factor list.
- `NSNR-IO-006`: unsupported nonlinear procedure or mixed linear/nonlinear steps fail closed with `unsupported-analysis-procedure`.
- `NSNR-IO-007`: S4 and S4R shell definitions remain approved nonlinear semantic inputs.
- `NSNR-IO-008`: mixed B33/S4 nonlinear model fails with `unsupported-mixed-element-model`.
- `NSNR-IO-009`: `*OUTPUT, FIELD, VARIABLE=PRESELECT` is accepted with deterministic warning and no Domain state.
- `NSNR-IO-010`: `*OUTPUT, HISTORY, VARIABLE=PRESELECT` is accepted with deterministic warning and no Domain state.
- `NSNR-IO-011`: malformed PRESELECT parameters fail as input errors.

Run:

```powershell
cmake --build .harness/build --config Debug
ctest --test-dir .harness/build -C Debug -R "Domain|DomainMapping|Abaqus" --output-on-failure
```

Expected: new tests fail. Unexpected pass stops the Step.

## GREEN

- Extend `StaticStepDefinition` and `StepDefinition` exactly with the fields and accessors above.
- Update domain construction so source-order boundaries and loads remain deterministic.
- Update `domain_mapping_context` to parse `NLGEOM=YES`, preserve raw `*STATIC`, emit PRESELECT warnings, and keep PRESELECT out of Domain state.
- Preserve existing linear shell and beam mappings.

## VERIFY

```powershell
cmake --fresh -S . -B .harness/build -G "Visual Studio 18 2026" -A x64 `
  "-DFESA_GTEST_SOURCE_DIR=$gtestSource" `
  "-DMKL_DIR=$mklDir" `
  "-DTBB_DIR=$tbbDir" `
  "-DHDF5_DIR=$hdf5Dir"
cmake --build .harness/build --config Debug
ctest --test-dir .harness/build -C Debug -R "Domain|DomainMapping|Abaqus" --output-on-failure
ctest --test-dir .harness/build -C Debug --show-only=json-v1
ctest --test-dir .harness/build -C Debug --output-on-failure
```

Recheck `.harness/config.json` before using these defaults.

## 상태 기록

Only Step 1 status and one-line summary/error/blocked payload may be updated by the Implementation Agent. Executor owns timestamps, commits, retry, and next Step selection.

## 금지사항

- Do not add `LoadFactorSequence()` to Domain. 이유: factor sequence ownership belongs to Step 5 control.
- Do not store PRESELECT flags in Domain or HDF5 state. 이유: approved I/O contract makes PRESELECT an ignored warning no-op.
- Do not alter requirements or I/O docs. 이유: upstream contracts are approved.