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# Step 9: nonlinear-hdf5-schema-v1-writer
## 읽어야 할 파일
- `AGENTS.md`
- `docs/ARCHITECTURE.md`
- `docs/ADR.md`
- `docs/nonlinear-static-newton-raphson/io.md`
- `docs/nonlinear-static-newton-raphson/reference-model.md`
- `include/fesa/io/hdf5/hdf5_results_writer.h`
- `include/fesa/results/results_writer.h`
- `src/fesa/io/hdf5/hdf5_results_writer.cpp`
- `src/fesa/io/hdf5/hdf5_primitives.h`
- `src/fesa/io/hdf5/hdf5_primitives.cpp`
- `src/fesa/io/hdf5/hdf5_self_check.h`
- `src/fesa/io/hdf5/hdf5_self_check.cpp`
- `tests/unit/io/hdf5/hdf5_results_writer_test.cpp`
- Step 8 files: `include/fesa/analysis/nonlinear_analysis_state.h`
## 이전 Step 전제
Step 8 provides committed nonlinear accepted-frame state. Step 0 and Step 10 own the rule that log close succeeds before this writer is invoked.
## 소유 파일
- Create: `include/fesa/io/hdf5/nonlinear_hdf5_results_writer.h`
- Create: `src/fesa/io/hdf5/nonlinear_hdf5_results_writer.cpp`
- Create: `include/fesa/results/nonlinear_results_writer.h`
- Create: `tests/unit/io/hdf5/nonlinear_hdf5_results_writer_test.cpp`
- Modify: `src/fesa/io/hdf5/hdf5_primitives.h`
- Modify: `src/fesa/io/hdf5/hdf5_primitives.cpp`
- Modify: `src/fesa/io/hdf5/hdf5_self_check.h`
- Modify: `src/fesa/io/hdf5/hdf5_self_check.cpp`
- Modify: `src/fesa/CMakeLists.txt`
- Modify: `tests/CMakeLists.txt`
## 인터페이스
```cpp
namespace fesa {
class NonlinearResultsWriter {
public:
virtual ~NonlinearResultsWriter() = default;
virtual Status Write(const std::filesystem::path& output_path,
const Domain& domain,
const NonlinearAnalysisState& state,
const std::vector<Diagnostic>& diagnostics) = 0;
};
class NonlinearHdf5ResultsWriter final : public NonlinearResultsWriter {
public:
Status Write(const std::filesystem::path& output_path,
const Domain& domain,
const NonlinearAnalysisState& state,
const std::vector<Diagnostic>& diagnostics) override;
};
} // namespace fesa
```
## RED
Add tests first.
- `NSNR-HDF5-001`: `/metadata` has `schema_version=1`, `feature_id=nonlinear-static-newton-raphson`, and approved procedure/formulation/integration attributes.
- `NSNR-HDF5-002`: `/model/nodes`, `/model/elements`, shell section/material/frame/director/constraint datasets match I/O schema.
- `NSNR-HDF5-003`: `/steps/Step-1/accepted_frames` has one row per committed increment.
- `NSNR-HDF5-004`: final row has load factor `1.0` and `is_factor_one=1`.
- `NSNR-HDF5-005`: factor zero metadata exists and factor zero is not a frame.
- `NSNR-HDF5-006`: per-frame nodal displacement, triad, director, internal, external, residual, reaction datasets have approved shapes and column ordering.
- `NSNR-HDF5-007`: reaction rotational columns store `J_l(phi)^(-T)` spatial physical moment.
- `NSNR-HDF5-008`: element shell local frame, generalized strain, section resultant, stress datasets exist with approved shape and identity.
- `NSNR-HDF5-009`: `/global/energy` and `/global/equilibrium` exist for each accepted frame.
- `NSNR-HDF5-010`: no trial history dataset is written.
- `NSNR-HDF5-011`: HDF5 candidate failure preserves prior final file.
- `NSNR-HDF5-012`: writer consumes `std::vector<Diagnostic>` and writes deterministic diagnostics.
- `NSNR-HDF5-013`: `NonlinearHdf5ResultsWriter` implements backend-neutral `NonlinearResultsWriter`, and no HDF5 handle/type appears in analysis/core public headers.
Run:
```powershell
cmake --build --preset windows-msvc-ninja-debug
ctest --preset windows-msvc-ninja-debug -R "NonlinearHdf5|Hdf5ResultsWriter" --output-on-failure
```
Expected: new tests fail. Unexpected pass stops.
## GREEN
Implement `include/fesa/results/nonlinear_results_writer.h` as the backend-neutral boundary and implement schema-v1 nonlinear HDF5 writer using existing HDF5 RAII/primitives/self-check style. Keep HDF5 and platform types private to `src/fesa/io/hdf5`.
## VERIFY
```powershell
cmake --preset windows-msvc-ninja-debug
cmake --build --preset windows-msvc-ninja-debug
ctest --preset windows-msvc-ninja-debug -R "NonlinearHdf5|Hdf5ResultsWriter" --output-on-failure
ctest --preset windows-msvc-ninja-debug --show-only=json-v1
ctest --preset windows-msvc-ninja-debug --output-on-failure
```
Use the ignored `.harness/config.json` preset contract. The Harness process must inherit VsDevCmd x64 and `FESA_GTEST_SOURCE_DIR`, `MKL_DIR`, `TBB_DIR`, and `HDF5_DIR` from its parent launch environment.
## 상태 기록
Update only Step 9 status and one-line payload. Executor owns timestamps, commits, retry, and advancement.
## 금지사항
- Do not open, write, or replace HDF5 before log close succeeds. 이유: Step 10 app lifecycle enforces log-before-HDF5 finalization.
- Do not write compression, chunking, or trial history. 이유: io.md requires contiguous accepted-state storage.
- Do not make CSV an authoritative output. 이유: official solver output is HDF5.
- Do not include HDF5 headers from analysis/core public headers. 이유: output backend types stay behind writer interfaces.