feat(linear-static-3d-euler-beam): step 23 - hdf5-results-writer

docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md

@@ -1130,3 +1130,82 @@
   the subsequent uncontended serial build, targeted, discovery, full sequence
   followed by a separate successful audit command.
 - concerns: none; no upstream-contract conflict or critical blocker remains.
+
+## Step 23 — hdf5-results-writer
+
+- task_id: `TASK-23`
+- status: `completed`
+- changed_files: `include/fesa/results/results_writer.hpp`,
+  `include/fesa/io/hdf5/hdf5_results_writer.hpp`,
+  `src/fesa/io/hdf5/hdf5_results_writer.cpp`,
+  `tests/unit/results/results_writer_test.cpp`,
+  `tests/unit/io/hdf5/hdf5_results_writer_test.cpp`,
+  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
+  `cmake/FesaDependencies.cmake`,
+  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
+  `phases/linear-static-3d-euler-beam/index.json`
+- requirement_ids: `FESA-REQ-LS3DEB-003`, `FESA-REQ-LS3DEB-015`,
+  `FESA-REQ-LS3DEB-019`, `FESA-REQ-LS3DEB-020`,
+  `FESA-REQ-LS3DEB-023`, `FESA-REQ-LS3DEB-025`,
+  `FESA-REQ-LS3DEB-028`, `FESA-REQ-LS3DEB-029`,
+  `FESA-REQ-LS3DEB-030`, `FESA-REQ-LS3DEB-031`,
+  `FESA-REQ-LS3DEB-032`, `FESA-REQ-LS3DEB-034`
+- test_ids: `T23-HDF5-001`, `T23-HDF5-002`, `T23-HDF5-003`,
+  `T23-HDF5-004`, `T23-HDF5-005`
+
+| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
+| --- | --- | ---: | --- | --- |
+| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | All five ledger tests were registered before either public production header existed | MSVC C1083 reported missing `fesa/results/results_writer.hpp` and `fesa/io/hdf5/hdf5_results_writer.hpp` |
+| INFRA-link | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Production and tests compiled, but the packaged static HDF5 target could not link in this environment | LNK1104 reported missing `libircmt.lib`; this is infrastructure evidence, not the feature RED |
+| INFRA-runtime-discovery | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Shared HDF5 linked after normalized-target repair, but post-build GoogleTest discovery could not load a transitive runtime | discovery exited `0xc0000135`; `dumpbin /dependents hdf5.dll` identified `libmmd.dll` |
+| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimum schema-v0 writer, tests, solver library, and unit executable compile/link after the approved runtime repair | `hdf5_results_writer.cpp` and both tests built under `/W4 /WX`; required runtime DLLs were staged before discovery |
+| GREEN-test | `ctest --test-dir .harness/build -C Debug -R Hdf5ResultsWriter --output-on-failure` | 0 | Exact schema, mandatory outputs, diagnostics/centroid, failure preservation, and successful replacement pass | 5/5 exact `Hdf5ResultsWriter` tests passed |
+| VERIFY-configure | `cmake -S . -B .harness/build -A x64 -DFESA_GTEST_SOURCE_DIR=C:/git/googletest "-DMKL_DIR=C:/Program Files (x86)/Intel/oneAPI/mkl/2026.1/lib/cmake/mkl" "-DTBB_DIR=C:/Program Files (x86)/Intel/oneAPI/tbb/2023.1/lib/cmake/tbb" "-DHDF5_DIR=C:/Program Files/HDF_Group/HDF5/2.1.1/cmake"` | 0 | Approved explicit-dependency MSVC x64 build tree generates | Visual Studio 18/MSVC x64, Windows SDK 10.0.26100.0, oneMKL, oneTBB, and shared HDF5 resolved; configure/generate completed |
+| VERIFY-build | `cmake --build .harness/build --config Debug` | 0 | Full Debug build passes without a new FESA warning | `fesa_solver.lib` and `fesa_unit_tests.exe` built under `/W4 /WX` |
+| VERIFY-targeted | `ctest --test-dir .harness/build -C Debug -R Hdf5ResultsWriter --output-on-failure` | 0 | Focused Step 23 suite remains green | 5/5 exact `Hdf5ResultsWriter` tests passed |
+| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all five exact ledger names | 73 tests discovered, including exactly 5 `Hdf5ResultsWriter` tests |
+| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 73/73 tests passed in 2.75 seconds |
+| VERIFY-runtime | `& 'C:\Program Files\Microsoft Visual Studio\18\Community\VC\Tools\MSVC\14.51.36231\bin\Hostx64\x64\dumpbin.exe' /dependents 'C:\Program Files\HDF_Group\HDF5\2.1.1\bin\hdf5.dll'` | 0 | The package DLL's undeclared Intel runtime requirement is traceable | dependencies include `libmmd.dll`; the WIN32 staging guard copies `${OMP_DLL_DIR}/libmmd.dll` |
+| VERIFY-contract-scans | Public HDF5/Win32 type scan, exact-test count, finalizer/RAII scope scan, forbidden shear/averaging/filter scan, `git diff --check`, and reference diff/status | 0 | Backend boundary, exact mandatory-output scope, atomic finalization, and reference immutability remain isolated | public backend leaks 0; exact tests 5; checked file closes and exact Replace/Move split present; forbidden scope 0; whitespace clean; reference unchanged |
+
+- contract_checks: `ResultsWriter` and `Hdf5ResultsWriter` expose only the
+  approved backend-free signatures. HDF5, Win32 handles, macros, RAII wrappers,
+  schema construction, self-check, and atomic finalization stay private to the
+  implementation; `Fesa::HDF5` is linked privately.
+- contract_checks: schema v0 writes every literal metadata, model, and
+  `/steps/Step-1/frames/0` path, including `generalized_resultant`. Numeric
+  fields use IEEE little-endian float64, stable identities use little-endian
+  uint64 compound members, text uses UTF-8 variable-length strings, and exact
+  component/unit/coordinate/location/step/frame attributes are pinned.
+- contract_checks: non-axis-aligned element axes, node/element identity,
+  connectivity, and representative first/last nonzero values for displacement,
+  reaction, end action, section resultant, generalized strain, and generalized
+  resultant prove solved state is connected to output. Output requests do not
+  filter any mandatory field; shear/averaged stress was not added.
+- contract_checks: diagnostics are stable-sorted and preserved, an empty input
+  produces an exact zero-row compound dataset, and the default centroid stress
+  row serializes axial `S11` only. Dimensions, row identity/order, source
+  identity, and all numeric values are validated before finalization.
+- atomicity: a unique same-directory temporary file is fully written, flushed,
+  checked-closed, reopened read-only for exact schema self-check, and
+  checked-closed before finalization. Existing finals use only
+  `ReplaceFileW(final,temp,nullptr,...)`; new finals use only
+  `MoveFileExW(temp,final,MOVEFILE_WRITE_THROUGH)`. Failure removes the temp,
+  leaves no partial new final, and preserves pre-existing final bytes.
+- infrastructure_resolution: the approved normalized HDF5 dependency now
+  prefers the package shared target, with static and `HDF5::HDF5` fallbacks.
+  Tests stage `$<TARGET_RUNTIME_DLLS:fesa_unit_tests>` plus the package DLL's
+  verified `${OMP_DLL_DIR}/libmmd.dll` dependency without directly naming an
+  HDF5 package target or hardcoding an Intel installation path.
+- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
+  `.harness/build/tests/Debug/fesa_unit_tests.exe`; all test HDF5/temp artifacts
+  are confined to build-tree temporary directories and cleaned by their owners.
+- reference_diff: unchanged; `git diff --exit-code -- reference/` and
+  `git status --short -- reference/` both report no change.
+- handoff: Step 24 can construct the backend-free writer and rely on mandatory
+  schema-v0 output and fail-atomic replacement. Its production executable must
+  stage the selected HDF5 target runtime DLLs and `${OMP_DLL_DIR}/libmmd.dll`
+  with the same portable target-expression/runtime-guard policy used by tests.
+- concerns: no remaining critical implementation or upstream-contract blocker.
+  The HDF5 static-link and shared-runtime environment blockers were resolved
+  and are recorded separately from the valid missing-API RED.