# Linear Static 3D Euler Beam Implementation Report

## Metadata

- feature_id: `linear-static-3d-euler-beam`
- source_plan: `docs/implementation-plans/linear-static-3d-euler-beam.md`
- source_design: `docs/superpowers/specs/2026-08-08-linear-static-3d-euler-beam-design.md`
- status: `in-progress`
- owner_agent: `implementation-agent`
- validation_environment: `Windows, MSVC 19.51.36252, Visual Studio 18 2026, x64 Debug`
- report_started: `2026-08-09`

## Step 7 — cmake-test-foundation

- task_id: `TASK-07`
- status: `completed`
- changed_files: `CMakeLists.txt`, `cmake/FesaDependencies.cmake`,
  `include/fesa/build_info.hpp`, `src/fesa/build_info.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `tests/unit/build_info_test.cpp`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-030`, `FESA-REQ-LS3DEB-034`
- test_ids: `T07-BUILD-001`, `T07-BUILD-002`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | Temporarily move `include/fesa/build_info.hpp` to `.harness/build_info.hpp.red-backup`; run `cmake --build .harness/build --config Debug --target fesa_unit_tests`; restore the header in `finally` | 1 | Build fails because the public API is unavailable | `build_info.cpp(1,10): error C1083: 'fesa/build_info.hpp': No such file or directory` |
| GREEN | `cmake --build .harness/build --config Debug --target fesa_tests`; `ctest --test-dir .harness/build -C Debug -R BuildInfo --output-on-failure` | 0 | Foundation target builds and both named BuildInfo tests pass | `BuildInfo.VersionIsStableAndNonEmpty` and `BuildInfo.PublicHeaderHasNoBackendDependency`: 2/2 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 | MSVC x64 Debug build tree generated and dependencies resolved | Visual Studio 18 2026; MSVC 19.51.36252; MKL 2026.1; TBB and HDF5 CONFIG packages resolved |
| VERIFY-build | `cmake --build .harness/build --config Debug` | 0 | FESA and GoogleTest targets build without FESA warnings | `fesa_solver.lib` and `fesa_unit_tests.exe` built; no warning emitted under FESA `/W4 /WX` |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers at least one test | 2 tests discovered, both carrying `linear-static-3d-euler-beam` and `unit` labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full suite has zero failures | 2/2 tests passed |

- contract_checks: GoogleTest revision
  `04ee1b4f2aefdffb0135d7cf2a2c519fe50dabe4`; no default
  `C:/git/googletest` path in production CMake; `/W4 /WX` is private to
  `fesa_solver`; public BuildInfo header exposes only `std::string_view`.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- environment_note: Native Codex Windows workspace sandboxes stalled in the
  CMake compiler-id `cl.exe` child process. The identical approved configure,
  build, and CTest commands were therefore executed by the root session's
  authorized unrestricted shell; the same configure completed in 7.9 seconds.
- reference_diff: unchanged
- handoff: `fesa_solver`, `fesa_unit_tests`, `fesa_tests`, normalized
  `Fesa::MKL`, `Fesa::TBB`, `Fesa::HDF5`, and `solverVersion()` are available
  to Step 8.

## Step 8 — core-diagnostics

- task_id: `TASK-08`
- status: `completed`
- changed_files: `include/fesa/core/source_identity.hpp`,
  `include/fesa/core/diagnostic.hpp`, `include/fesa/core/status.hpp`,
  `src/fesa/core/diagnostic.cpp`, `src/fesa/core/status.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `tests/unit/core/source_identity_test.cpp`,
  `tests/unit/core/diagnostic_test.cpp`, `tests/unit/core/status_test.cpp`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-033`, `FESA-REQ-LS3DEB-034`
- test_ids: `T08-CORE-001`, `T08-CORE-002`, `T08-CORE-003`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Tests are registered before production and fail for the three missing core headers | MSVC C1083 for `fesa/core/diagnostic.hpp`, `fesa/core/source_identity.hpp`, and `fesa/core/status.hpp` |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal core implementation and all test translation units build | `diagnostic.cpp`, `status.cpp`, and three core tests compile; `fesa_unit_tests.exe` links |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R CoreDiagnostics --output-on-failure` | 0 | Identity, deterministic ordering, and Result exclusivity pass | 3/3 `CoreDiagnostics` 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 MSVC x64 build tree regenerates with normalized dependencies | Configure and generate completed; MKL 2026.1 resolved |
| 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 CoreDiagnostics --output-on-failure` | 0 | Focused Step 8 suite remains green | 3/3 tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the existing and new named tests | 5 tests discovered with feature and unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 5/5 tests passed |
| VERIFY-harness | `uv run --with pytest python -m pytest -v -rs` | 0 | Harness regression suite remains green | 4/4 tests passed |

- contract_checks: `SourceEntityId` preserves numeric and raw label forms;
  `sortDiagnostics()` applies the fixed file/line/keyword/entity/code tuple with
  stable discovery-order ties; `Status` owns sorted diagnostics and optional
  failure category; `Result<T>` owns either a value or failed status and rejects
  both failed value access and construction from an OK status. Core public
  headers include only FESA core or C++ standard-library headers; no
  MKL/TBB/HDF5 names are present.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged
- handoff: `SourceLocation`, `SourceEntityId`, `Diagnostic`, deterministic
  diagnostic sorting, `FailureCategory`, `Status`, and `Result<T>` are available
  to Step 9 and later parser/model/solver tasks.

## Step 9 — dense-math-adapters

- task_id: `TASK-09`
- status: `completed`
- changed_files: `include/fesa/math/vector.hpp`,
  `include/fesa/math/matrix.hpp`, `src/fesa/math/vector.cpp`,
  `src/fesa/math/matrix.cpp`, `tests/unit/math/vector_test.cpp`,
  `tests/unit/math/matrix_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-025`, `FESA-REQ-LS3DEB-034`
- test_ids: `T09-DENSE-001`, `T09-DENSE-002`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | `cmake --build .harness/build --config Debug --target fesa_tests`; `ctest --test-dir .harness/build -C Debug -R DenseMath --output-on-failure` | 1 | Both planned tests are registered before production and the build fails for the missing dense-math API | MSVC C1083 for `fesa/math/matrix.hpp` and `fesa/math/vector.hpp`; DenseMath discovery is unavailable until the test executable builds |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal dense adapters, tests, and runtime staging compile, link, and complete GoogleTest discovery | `matrix.cpp`, `vector.cpp`, both math tests, `fesa_solver.lib`, and `fesa_unit_tests.exe` built; no FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R DenseMath --output-on-failure` | 0 | Storage/ownership/checking and row-major BLAS contracts pass | 2/2 DenseMath 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 MSVC x64 build tree regenerates with explicit dependencies | Configure/generate completed; oneMKL 2026.1 dynamic ILP64 backend resolved |
| 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 DenseMath --output-on-failure` | 0 | Focused dense-math suite remains green | 2/2 tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated tests and both exact DenseMath names | 7 tests discovered with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 7/7 tests passed |
| VERIFY-public-header | `$leaks = rg -n "mkl\.h\|MKL_INT\|CBLAS_" include/fesa; if ($LASTEXITCODE -eq 0) { throw "MKL API leaked into public headers:`n$leaks" }; if ($LASTEXITCODE -ne 1) { throw 'Public-header dependency scan failed' }` | 0 | Public headers remain independent of oneMKL API and types | `rg` returned the required no-match exit 1; wrapper scan completed with zero leaks |

- contract_checks: `Vector` accepts zero size, owns contiguous doubles, deep-copies,
  leaves moved-from objects empty and usable, checks every index, and rejects dot/axpy
  mismatches; `Matrix` accepts zero dimensions, owns row-major contiguous doubles,
  deep-copies, leaves moved-from objects empty and usable, checks every index, and
  rejects GEMV/GEMM mismatches. Hand-derived nonsquare GEMV `[50,122]` and GEMM
  `[[58,64],[139,154]]` pass. All copy, dot, norm, scale, axpy, GEMV, and GEMM calls
  cross CBLAS only inside `.cpp` files. Windows tests stage the package-resolved
  oneMKL/OpenMP runtime before post-build discovery because the exact shell does not
  assume oneAPI in `PATH`.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: backend-free `fesa::Vector` and `fesa::Matrix` public APIs, with owning
  dense storage and checked BLAS operations, are available to Step 10 and later
  DOF/element/assembly tasks.

### Review Fix Round 1 — matrix-storage-size-overflow

- regression_test: `tests/unit/math/matrix_test.cpp` now constructs
  `Matrix{SIZE_MAX / 2 + 1, 2}` and requires `std::length_error`.
- RED: `cmake --build .harness/build --config Debug --target fesa_tests` exited 0;
  `ctest --test-dir .harness/build -C Debug -R DenseMath --output-on-failure`
  exited 8 with 1/2 failures because the wraparound constructor threw nothing.
- fix: `Matrix` computes its storage size through a checked helper before vector
  construction and rejects exactly `columns != 0 && rows > SIZE_MAX / columns`.
- GREEN: the same targeted build and DenseMath CTest commands exited 0; 2/2 passed.
- VERIFY: approved MSVC x64 configure and full Debug build exited 0; targeted
  DenseMath passed 2/2, discovery found 7 tests, and the full suite passed 7/7.
  The public-header MKL scan had zero matches, `git diff --check` exited 0, and
  `git diff --exit-code -- reference/` exited 0.
- scope: the deferred empty-dot review minor was not changed, reference artifacts
  remain untouched, and phase Step 9 status/timestamps were not modified.

## Step 10 — domain-model

- task_id: `TASK-10`
- status: `completed`
- changed_files: `include/fesa/model/model_types.hpp`,
  `include/fesa/model/domain.hpp`, `src/fesa/model/domain.cpp`,
  `tests/unit/model/model_types_test.cpp`, `tests/unit/model/domain_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-10-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-015`, `FESA-REQ-LS3DEB-016`,
  `FESA-REQ-LS3DEB-021`, `FESA-REQ-LS3DEB-030`,
  `FESA-REQ-LS3DEB-034`
- test_ids: `T10-DOM-001`, `T10-DOM-002`, `T10-DOM-003`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Both planned test translation units are registered before production and fail for the missing model API | MSVC C1083 for `fesa/model/domain.hpp` and `fesa/model/model_types.hpp`; the subsequent `ctest --test-dir .harness/build -C Debug -R DomainModel --output-on-failure` exited 0 with `No tests were found` because the new test executable could not build |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal model records, immutable Domain ownership, and both tests compile and link | `domain.cpp`, `domain_test.cpp`, and `model_types_test.cpp` built; `fesa_solver.lib` and `fesa_unit_tests.exe` linked without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R DomainModel --output-on-failure` | 0 | Source/internal identity, stable immutable ownership, and multiple-instance distinction pass | 3/3 exact `DomainModel` 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 MSVC x64 build tree regenerates with explicit dependencies | Configure and generate completed; oneMKL 2026.1 and the existing dependency targets resolved |
| 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 DomainModel --output-on-failure` | 0 | Focused Step 10 suite remains green | 3/3 `DomainModel` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all exact DomainModel names | 10 tests discovered with `linear-static-3d-euler-beam` and `unit` labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 10/10 tests passed |
| VERIFY-dependency-direction | Backend scan over `include/fesa`; upward-include scan from `include/fesa/model`; core-to-model include scan from `include/fesa/core` using `rg -n` and fail-on-match wrappers | 0 | Public headers expose no MKL/PARDISO/TBB/HDF5 API and preserve `core -> model` dependency direction | backend leaks 0; model upward dependencies 0; core-to-model dependencies 0 |
| VERIFY-diff | `git diff --check` | 0 | Patch has no whitespace errors | Exit 0; only Git LF-to-CRLF working-copy notices were emitted |
| VERIFY-reference | `git diff --exit-code -- reference/` | 0 | Approved reference artifacts remain unchanged | Exit 0 and `git status --short -- reference/` produced no entries |

- contract_checks: every ledger record preserves `SourceLocation`; the static
  step retains all four timing values; `PartDefinition`, `InstanceDefinition`,
  and `SourceIndexMapping` retain source-to-internal identity; `ModelDefinition`
  retains source path/content identity, heading, warnings, and all semantic
  vectors. `Domain` owns the complete definition and returns const references;
  declaration-order vector positions remain stable internal indices. Node and
  beam definitions contain no equation-numbering state, and same-part identity
  instances retain distinct source identities and connectivity.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: backend-free `EntityIndex`, semantic model records,
  `ModelDefinition`, and immutable `Domain::create`/const accessors are
  available to Step 11 syntax parsing and Step 12 semantic mapping.

## Step 11 — inp-syntax-parser

- task_id: `TASK-11`
- status: `completed`
- changed_files: `include/fesa/io/abaqus/input_syntax.hpp`,
  `include/fesa/io/abaqus/input_reader.hpp`,
  `src/fesa/io/abaqus/input_reader.cpp`,
  `tests/unit/io/abaqus/input_syntax_test.cpp`,
  `tests/unit/io/abaqus/input_reader_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-11-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-010`, `FESA-REQ-LS3DEB-034`,
  `FESA-REQ-LS3DEB-040`
- test_ids: `T11-SYN-001`, `T11-SYN-002`, `T11-SYN-003`, `T11-SYN-004`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | `cmake --build .harness/build --config Debug --target fesa_tests`; `ctest --test-dir .harness/build -C Debug -R InpSyntax --output-on-failure` | 1 | Both planned test files are registered before production and fail for the missing reader API | MSVC C1083 for `fesa/io/abaqus/input_reader.hpp` in both new test translation units; CTest subsequently reported `No tests were found` because the executable could not build |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal syntax records, binary reader, and four tests compile and link | `input_reader.cpp`, both parser test files, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R InpSyntax --output-on-failure` | 0 | All exact syntax parsing behaviors pass | 4/4 `InpSyntax` 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 MSVC x64 build tree regenerates with explicit dependencies | Visual Studio 18 2026/MSVC environment selected; configure and generate completed; oneMKL 2026.1 resolved |
| 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 InpSyntax --output-on-failure` | 0 | Focused Step 11 suite remains green | 4/4 exact `InpSyntax` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all four exact syntax tests | 14 tests discovered with all four `InpSyntax` names and feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 14/14 tests passed |
| VERIFY-dependency-direction | Backend, upward I/O, core-to-I/O, and semantic-policy scans over the Step 11 public/production files using `rg -n` fail-on-match wrappers | 0 | Public headers retain backend-free `core -> io/abaqus` direction and syntax parsing contains no Step 12 policy | backend leaks 0; upward I/O dependencies 0; core-to-I/O dependencies 0; semantic-policy matches 0; exactly four `InpSyntax` tests found |
| VERIFY-diff | `git diff --check` | 0 | Patch has no whitespace errors | Exit 0; only informational Git LF-to-CRLF working-copy notices were emitted |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain unchanged | Diff exit 0 and reference status empty |

- contract_checks: `ParsedInput` records the absolute lexically normalized
  source path and exact binary-byte FNV-1a identity formatted as
  `fnv1a64:` plus 16 lowercase hexadecimal digits. Keyword and parameter names
  alone become ASCII uppercase; parameter values, data label lexemes, empty
  and trailing data fields, and each keyword `originalLine` preserve source
  spelling. Comments and blanks remain excluded while physical 1-based file
  line accounting is retained. Unreadable file, empty keyword, and orphan data
  return categorized input diagnostics. No keyword allowlist, wrapper/nesting,
  numeric conversion, B31/B33, or output-request decision exists in this Step.
  The read-only legacy input parses as 30 keyword blocks with exact identity
  `fnv1a64:04543464cc970405`, unchanged bytes, and unchanged modification time.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: backend-free `KeywordParameter`, `DataLine`, `KeywordBlock`,
  `ParsedInput`, and `AbaqusInputReader::read` with syntax/source provenance are
  available to Step 12 semantic mapping.


## Step 12 — inp-domain-mapping

- task_id: `TASK-12`
- status: `completed`
- changed_files: `include/fesa/io/abaqus/domain_mapper.hpp`,
  `src/fesa/io/abaqus/domain_mapper.cpp`,
  `tests/unit/io/abaqus/domain_mapper_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-12-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-001`, `FESA-REQ-LS3DEB-002`,
  `FESA-REQ-LS3DEB-005` through `FESA-REQ-LS3DEB-020`,
  `FESA-REQ-LS3DEB-034`, `FESA-REQ-LS3DEB-044`
- test_ids: `T12-MAP-001`, `T12-MAP-002`, `T12-MAP-003`,
  `T12-MAP-004`, `T12-MAP-005`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED | `cmake --build .harness/build --config Debug --target fesa_tests`; `ctest --test-dir .harness/build -C Debug -R InpDomainMapping --output-on-failure` | 1 | All five planned tests were registered before production and the implementation-owned mapper API was absent | MSVC C1083 reported missing `fesa/io/abaqus/domain_mapper.hpp`; CTest then found no runnable mapper tests because the executable did not build |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | The mapper, five semantic tests, solver library, and unit executable compile and link | `domain_mapper.cpp` and `domain_mapper_test.cpp` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R InpDomainMapping --output-on-failure` | 0 | Exact supported inventory, deterministic expansion, no-op policy, negative portfolio, and DLOAD exclusion pass | 5/5 exact `InpDomainMapping` 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 MSVC x64 build tree regenerates with explicit dependencies | Windows SDK and oneMKL 2026.1 resolved; configure and 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 the existing `/W4 /WX` policy |
| VERIFY-targeted | `ctest --test-dir .harness/build -C Debug -R InpDomainMapping --output-on-failure` | 0 | Focused Step 12 suite remains green after review corrections | 5/5 `InpDomainMapping` 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 mapper tests | 19 tests discovered with all five planned `InpDomainMapping` names and feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 19/19 tests passed |
| VERIFY-dependency-direction | Backend, upward-I/O, core-upward, distributed-load-object, unapproved-`nu`-gate, and exact-test-count scans over Step 12 files | 0 | Public dependencies and approved scope remain intact | backend leaks 0; upward dependencies 0; core upward dependencies 0; distributed-load objects 0; unapproved `nu` gates 0; mapper tests 5 |
| VERIFY-diff | `git diff --check` plus trailing-whitespace scan over the three new files | 0 | Tracked and untracked Step 12 files have no whitespace errors | Git reported informational LF-to-CRLF notices only; new-file trailing whitespace matches 0 |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: the mapper consumes syntax-only `ParsedInput` and returns
  one complete immutable `Domain` or a categorized diagnostic. It enforces the
  monotonic top-level/part/assembly/step grammar, B33 only, identity instances
  only, exact inclusive set generation, case-insensitive references, stable
  declaration/instance-order internal IDs, and `SourceEntityId
  {instance_name, source_label}`. Direct node labels, part and assembly sets,
  ambiguous multi-instance labels/sets, and direct-versus-set constraint
  overlap are resolved before Domain success.
- contract_checks: material and section mapping uses exact `E,nu`,
  `G=E/(2*(1+nu))`, `A,I11,I12,I22,J`, exact `I12=0`,
  `Iy=I11`, `Iz=I22`, and `n1 -> local y`. It requires positive
  `E,G,A,I11,I22,J` without adding a `nu < 0.5` gate. Nonfinite material,
  section, and guide data are model failures. Overflow-safe scaled norms apply
  the exact length and guide-vector inequalities; equality fails, values above
  pass, and valid finite geometry near `1e308` is accepted without a fallback
  axis.
- contract_checks: model-level and step-level boundaries and sole-step CLOAD
  targets are validated, conflicting expanded node/DOF prescriptions fail, the
  exact four positive finite `*STATIC` fields are retained, and the sole
  canonical result identity is `Step-1`, frame 0. The exact warning no-op
  allowlist produces stable `ignored-input-keyword` diagnostics without
  changing semantic objects. B31, transforms, nested/dependent assembly
  semantics, second step, NLGEOM, unknown keywords, and `*DLOAD` fail; no
  distributed-load Domain object, B31 alias, multi-step path, or transform
  fallback exists.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; the legacy cantilever input maps successfully
  while exact bytes and modification time remain unchanged, and
  `git diff --exit-code -- reference/` exits 0
- handoff: `AbaqusDomainMapper::map(const ParsedInput&)`, complete immutable
  Domain objects, stable expanded node/element/set identities, validated
  material/section indices, and the sole `StaticStepDefinition` are available
  to Step 13 `AnalysisModel`.

### Step 12 Review Corrections

- A duplicate-`*ELASTIC` regression test first failed because a second
  consecutive elasticity record lost the owning-material state. Preserving the
  immediate material eligibility produced the exact `duplicate-entity`
  diagnostic and restored targeted 5/5.
- Ten monotonic-order regressions first failed at the accepted late-`*PART`
  case. Explicit phase state now rejects late model data, assembly sets before
  or followed by instances, element-before-node, incomplete block closure, and
  pre-`*STATIC` or out-of-order history data with
  `invalid-keyword-location`.
- Review edge tests then failed for valid `1e308` geometry and for nonfinite
  elasticity being classified as input. Context-specific model parsing,
  overflow-safe scaled geometry comparisons, active beam-section context,
  exact GENERATE landing, direct/ambiguous target resolution, and exact
  threshold cases were added. The corrected focused suite passes 5/5 and the
  full accumulated suite passes 19/19.
- Focused re-review returned Critical 0 and Important 0. Its sole remaining
  minor requested an explicit negative transverse-shear context assertion;
  that table case was added and passes without a production change.

### Step 12 Root Review Fix Round 1 — same-token target ambiguity

- finding: `resolveNodeTarget` returned one matching node set before computing
  the direct numeric source-label candidates. A token such as `1` therefore
  silently selected `NSET=1` even when node source label `1` was also a valid
  interpretation.
- regression_scope: `RejectsUnsupportedAndInvalidPortfolio` now constructs an
  `NSET` named `1` containing node `2` while node label `1` also exists, and
  exercises the same token independently through both `*BOUNDARY` and
  `*CLOAD`. It requires input-category `unresolved-reference` with exact
  keyword, entity identity `1`, and original data-row file/line location.
- RED-build: `cmake --build .harness/build --config Debug --target fesa_tests`
  exited 0 after registering the two regression paths.
- RED-test: `ctest --test-dir .harness/build -C Debug -R "InpDomainMapping.RejectsUnsupportedAndInvalidPortfolio" --output-on-failure`
  exited 8. The test failed at `same-token-boundary`
  because `result.hasValue()` was true instead of the required structured
  failure.
- fix: target resolution computes both name-matched node sets and numeric
  direct-node candidates before returning either. Multiple candidates within
  an interpretation or one valid candidate from each interpretation use the
  existing input/`unresolved-reference` ambiguity contract; unique set-only
  and direct-only paths remain unchanged.
- GREEN: the targeted build exited 0 and `ctest --test-dir .harness/build -C Debug -R InpDomainMapping --output-on-failure`
  exited 0 with 5/5 passed.
- VERIFY: approved explicit-dependency MSVC x64 configure and full Debug build
  exited 0; discovery found 19 tests including all five mapper names; full
  CTest passed 19/19. Backend/upward/core-upward/distributed-load/unapproved
  `nu` scans were 0, exactly five mapper tests remained, `git diff --check`
  exited 0, and reference diff/status were clean.
- deferred_scope: the separate known-but-misplaced keyword diagnostic Minor was
  deliberately not changed in this fix round. No phase-index change and no
  commit were made.

## Step 13 — analysis-model

- task_id: `TASK-13`
- status: `completed`
- changed_files: `include/fesa/analysis/analysis_model.hpp`,
  `src/fesa/analysis/analysis_model.cpp`,
  `tests/unit/analysis/analysis_model_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-13-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-001`, `FESA-REQ-LS3DEB-021`,
  `FESA-REQ-LS3DEB-034`
- test_ids: `T13-MODEL-001`, `T13-MODEL-002`, `T13-MODEL-003`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly three planned tests were registered before production and the AnalysisModel API was absent | MSVC C1083 reported missing `fesa/analysis/analysis_model.hpp` from `analysis_model_test.cpp` |
| RED-test | `ctest --test-dir .harness/build -C Debug -R AnalysisModel --output-on-failure` | 0 | No focused test was runnable because the test executable could not rebuild | CTest reported `No tests were found` after the implementation-owned compile RED |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal non-owning active view and all three tests compile and link | `analysis_model.cpp`, `analysis_model_test.cpp`, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R AnalysisModel --output-on-failure` | 0 | Active classification, address identity/immutability, and cardinality diagnostics pass | 3/3 exact `AnalysisModel` 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 | Windows SDK and oneMKL 2026.1 resolved; configure and 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 AnalysisModel --output-on-failure` | 0 | Focused Step 13 suite remains green | 3/3 exact `AnalysisModel` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all three exact AnalysisModel names | 22 tests discovered with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 22/22 tests passed |
| VERIFY-dependency-direction | Backend public-header, upward-analysis dependency, DOF/numeric-state, exact-test-count, registration, and trailing-whitespace scans using fail-on-match `rg` wrappers | 0 | AnalysisModel stays backend-free and below later solver layers, with no DOF/state ownership | backend leaks 0; upward dependencies 0; DOF/numeric-state leaks 0; tests 3; CMake registrations 1/1; new-file trailing whitespace 0 |
| VERIFY-diff | `git diff --check` | 0 | Tracked patch has no whitespace errors | Exit 0; only informational Git LF-to-CRLF working-copy notices were emitted |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: `AnalysisModel` stores one non-owning `const Domain*` plus
  stable `EntityIndex` vectors only. All Domain elements are active in stable
  internal order; reachable material and section IDs are deduplicated by an
  ascending internal-index scan; boundary/load IDs are the sole step's vector
  positions. `domain()` and `step()` preserve exact address identity, and the
  tests verify semantic storage addresses and values remain unchanged. Missing
  and multiple steps return categorized `invalid-model-cardinality` and
  `unsupported-multiple-step` diagnostics. No equation numbering, constraint
  propagation, multi-step activation, or numeric analysis state was added.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: the exact AnalysisModel ledger API, sole-step reference, and stable
  active element/material/section/boundary/load IDs are available to Step 14
  `DofManager` without copying or mutating Domain entities.

## Step 14 — dof-manager

- task_id: `TASK-14`
- status: `completed`
- changed_files: `include/fesa/fem/dof_manager.hpp`,
  `src/fesa/fem/dof_manager.cpp`, `tests/unit/fem/dof_manager_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-14-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-003`, `FESA-REQ-LS3DEB-007`,
  `FESA-REQ-LS3DEB-011`, `FESA-REQ-LS3DEB-022`,
  `FESA-REQ-LS3DEB-034`
- test_ids: `T14-DOF-001`, `T14-DOF-002`, `T14-DOF-003`,
  `T14-DOF-004`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly four planned tests are registered before production and fail for the missing DofManager API | MSVC C1083 reported missing `fesa/fem/dof_manager.hpp` from `dof_manager_test.cpp` after successful CMake regeneration |
| RED-test | `ctest --test-dir .harness/build -C Debug -R DofManager --output-on-failure` | 0 | No focused test is runnable because the test executable cannot rebuild | CTest reported `No tests were found` after the implementation-owned compile RED |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal DofManager, its four tests, solver library, and unit executable compile and link | `dof_manager.cpp`, `dof_manager_test.cpp`, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R DofManager --output-on-failure` | 0 | Numbering, constraints, scatter/pattern, and mapping-owned round-trip pass | 4/4 exact `DofManager` 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 | Windows SDK and oneMKL 2026.1 resolved; configure and 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 DofManager --output-on-failure` | 0 | Focused Step 14 suite remains green | 4/4 exact `DofManager` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all four exact DofManager names | 26 tests discovered, including 4 `DofManager` tests, with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 26/26 tests passed |
| VERIFY-contract-scans | Backend public-header, upward-FEM dependency, model/analysis equation-state, out-of-scope feature, unledgered API, exact-test-count, and CMake-registration scans using fail-on-match `rg` wrappers | 0 | DofManager remains the sole equation/scatter/pattern owner and implements only the exact public ledger | backend leaks 0; upward dependencies 0; model/analysis equation state 0; penalty/MPC/RBE/numeric sparse storage 0; unledgered APIs 0; tests 4; registrations 1/1 |
| VERIFY-diff | `git diff --check` plus trailing-whitespace scan over the three new files | 0 | Tracked and untracked Step 14 files have no whitespace errors | Diff check exit 0; new-file trailing whitespace matches 0 |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: full DOFs follow stable node index and exact component order
  `[UX,UY,UZ,URX,URY,URZ]`; free equations and constrained DOFs are ascending
  full-index mappings. Case-insensitive node-set and direct source-label targets
  expand deterministically; equal overlap is retained once, while different
  values return `conflicting-boundary-condition` at the conflicting row's
  source location. `prescribedValues()` has the same size/order as
  `constrainedDofs()` and preserves zero and nonzero values.
- contract_checks: each active B33 definition has one 12-entry scatter in
  endpoint/component order. The full-space CSR pattern has 19 row offsets and
  252 sorted-unique structural columns for the two-element chain fixture.
  Stable free/constrained maps reconstruct the full vector without adding an
  API absent from the exact ledger. Node and element records remain unchanged
  and contain no equation IDs; no penalty, MPC, RBE, or sparse numeric storage
  was added.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`,
  `.harness/build/step14-ctest-discovery.json`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: backend-free `DofComponent`, `SparsePattern`, and the exact
  `DofManager` ledger API provide deterministic full/free/constrained maps,
  prescribed `dc`, active-element scatter, and full structural CSR pattern to
  Step 15 and later assembly/constraint tasks.

## Step 15 — analysis-state

- task_id: `TASK-15`
- status: `completed`
- changed_files: `include/fesa/results/result_records.hpp`,
  `include/fesa/analysis/analysis_state.hpp`,
  `src/fesa/analysis/analysis_state.cpp`,
  `tests/unit/results/result_records_test.cpp`,
  `tests/unit/analysis/analysis_state_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-15-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-003`, `FESA-REQ-LS3DEB-023`,
  `FESA-REQ-LS3DEB-031`, `FESA-REQ-LS3DEB-034`
- test_ids: `T15-STATE-001`, `T15-STATE-002`, `T15-STATE-003`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly three planned tests were registered before production and the result-record/state API was absent | MSVC C1083 reported missing `fesa/analysis/analysis_state.hpp` from both new test translation units after successful CMake regeneration |
| RED-test | `ctest --test-dir .harness/build -C Debug -R AnalysisState --output-on-failure` | 0 | No focused test was runnable because the unit test executable could not rebuild | CTest reported `No tests were found` after the implementation-owned compile RED |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal records/state implementation and all three tests compile and link | `analysis_state.cpp`, both test files, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R AnalysisState --output-on-failure` | 0 | Allocation, identity/order, and copy/move ownership tests pass | 3/3 exact `AnalysisState` 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 | Windows SDK and oneMKL 2026.1 resolved; configure and 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 AnalysisState --output-on-failure` | 0 | Focused Step 15 suite remains green | 3/3 exact `AnalysisState` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all three exact AnalysisState names | 29 tests discovered with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 29/29 tests passed |
| VERIFY-contract-scans | Backend public-header, forbidden V0 state/API, Domain/AnalysisModel ownership, result-record upward dependency, exact-test-count, and CMake-registration scans using fail-on-match `rg` wrappers | 0 | State and row records implement only the exact backend-free V0 ledger | backend leaks 0; forbidden state/API 0; Domain/AnalysisModel ownership 0; result upward dependencies 0; tests 3; registrations 1/1/1 |
| VERIFY-diff | `git diff --check` plus trailing-whitespace scan over the five new files | 0 | Tracked and untracked Step 15 files have no whitespace errors | Diff check exit 0; new-file trailing whitespace matches 0 |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: displacement, external force, internal force, residual, and
  reaction are five independently owned `Vector` values sized to
  `DofManager::fullDofCount()` and zero-initialized. Reaction remains in full
  DOF index space even when only a subset is constrained, leaving free
  components available for residual sanity checks. Mutable and const accessors
  return the same owned vector storage.
- contract_checks: `StepFrameIdentity`, `EndpointResultRow`, `GaussResultRow`,
  and `StressS11Row` match the public ledger field order. Owned endpoint,
  Gauss, and stress vectors preserve append order and expose stable mutable and
  const collections. Default copy/move operations follow the ledger: copies
  deep-own vector/row storage, and moved-to state retains identity and values
  without aliasing another live state.
- contract_checks: no velocity, acceleration, temperature, iteration history,
  nonlinear element state, Domain copy/reference, equation numbering, HDF5,
  MKL, or oneTBB API/storage was added.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: the exact backend-free result records and `AnalysisState` ledger API
  provide full-space mutable solution vectors, step/frame identity, and stable
  recovery-row collections to Step 16 and later result recovery/output tasks.

## Step 16 — euler-beam-element

- task_id: `TASK-16`
- status: `completed`
- changed_files: `include/fesa/elements/euler_beam_3d.hpp`,
  `src/fesa/elements/euler_beam_3d.cpp`,
  `tests/unit/elements/euler_beam_3d_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-16-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-002`, `FESA-REQ-LS3DEB-004`,
  `FESA-REQ-LS3DEB-008`, `FESA-REQ-LS3DEB-012`,
  `FESA-REQ-LS3DEB-013`, `FESA-REQ-LS3DEB-014`,
  `FESA-REQ-LS3DEB-031`, `FESA-REQ-LS3DEB-032`,
  `FESA-REQ-LS3DEB-035`, `FESA-REQ-LS3DEB-044`
- test_ids: `T16-BEAM-001`, `T16-BEAM-002`, `T16-BEAM-003`,
  `T16-BEAM-004`, `T16-BEAM-005`, `T16-BEAM-006`, `T16-BEAM-007`,
  `T16-BEAM-008`, `T16-BEAM-009`, `T16-BEAM-010`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly ten planned tests were registered before production and the EulerBeam3D public API was absent | MSVC C1083 reported missing `fesa/elements/euler_beam_3d.hpp` from `euler_beam_3d_test.cpp` after successful CMake regeneration |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | The minimum beam kernel, ten tests, solver library, and unit executable compile and link | `euler_beam_3d.cpp`, `euler_beam_3d_test.cpp`, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R EulerBeam3D --output-on-failure` | 0 | Reviewed signs, Gauss integration, rank, transform, loads, analytical modes, validation, recovery, patches, and negative control pass | 10/10 exact `EulerBeam3D` 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 | Windows SDK, oneMKL 2026.1, oneTBB, and HDF5 resolved; configure and 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 EulerBeam3D --output-on-failure` | 0 | Focused Step 16 suite remains green | 10/10 exact `EulerBeam3D` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all ten exact EulerBeam3D names | 39 tests discovered, including 10 `EulerBeam3D` tests, with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 39/39 tests passed |
| VERIFY-contract-scans | Backend public-header, upward-dependency, out-of-scope formulation, production one-point path, two-point Gauss/invariant, exact-test-count, and CMake-registration scans using fail-on-match `rg` wrappers | 0 | The kernel implements only the approved exact ledger and numerical integration contract | backend leaks 0; upward dependencies 0; out-of-scope couplings 0; production one-point paths 0; two-point Gauss consumers 3; normalized closed-form invariant `1e-12`; tests 10; registrations 1/1 |
| VERIFY-diff | `git diff --check` plus trailing-whitespace scan over the three new files | 0 | Tracked and untracked Step 16 files have no whitespace errors | Diff check exit 0; new-file trailing whitespace matches 0 |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- green_triage: the first implementation build passed and the first focused
  run was 9/10. The single failure was isolated to a large-coordinate test
  fixture whose requested equality rounded to a represented length above the
  threshold. The test fixture was replaced by an exactly representable unit
  threshold equality plus below/above large-coordinate cases; the production
  strict `>` comparison and formulation were unchanged before the 10/10 run.
- contract_checks: local DOF order is exactly
  `[u1,v1,w1,rx1,ry1,rz1,u2,v2,w2,rx2,ry2,rz2]`. Rotation rows are
  `(ex,ey,ez)`, `dl=T*dg`, and `Kg=T^T*Kl*T`. The B-matrix follows the reviewed
  `theta_y=-w'`, `theta_z=v'` signs; two-point Gauss `B^T D B` is the sole
  production stiffness path and is checked against the independent closed
  matrix with normalized tolerance `1e-12`. The test-only one-point rule has
  rank four while the production rule has rank six and six rigid modes.
- contract_checks: length and guide-vector tests use the exact scale-aware
  strict thresholds with no fallback axis. `E`, derived `G`, `A`, `Iy`, `Iz`,
  and `J` must be finite and positive and `I12` must be exactly zero. Constant
  local `px,py,pz,mx` receives the consistent signed load only; no parser,
  `*DLOAD`, B31, Timoshenko, shear correction, or transverse/torsional stress
  support was added.
- contract_checks: recovery keeps local outward equilibrium end actions,
  endpoint section resultants, and two-Gauss generalized strain/resultants
  distinct. Axial stress is
  `S11=E(epsilon0+x2*kappa_y-x1*kappa_z)` in input section-point order; absent
  input points produce section point 0 at the centroid with source
  `fesa-default`.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: the exact backend-free `EulerBeam3D` ledger API supplies global and
  local stiffness, constant local equivalent load, and distinct recovery data
  to Step 18 sparse assembly and Step 22 result recovery without owning element
  identity, equation numbering, parser coupling, or result persistence.

### Root numerical review — Fix Round 1

- scope: all three `Important` findings addressed in
  `src/fesa/elements/euler_beam_3d.cpp` and the existing exact T16 tests; the
  two `Minor` findings were intentionally not changed in this round.
- defect_RED: after adding finite-positive derived-overflow,
  derived-underflow, and length-scaled-underflow fixtures to existing
  `T16-BEAM-007`,
  `ctest --test-dir .harness/build -C Debug -R EulerBeam3D.RejectsInvalidGeometryAndProperties --output-on-failure`
  exited 8. All three invalid fixtures were accepted; the diagnostic path
  observed respectively a nonfinite stiffness with maximum `inf`, an all-zero
  stiffness, and a stiffness with a required bending coefficient underflowed
  to zero.
- defect_GREEN: `cmake --build .harness/build --config Debug --target fesa_tests`
  exited 0 and the same focused CTest exited 0 with 1/1 passed. `create()` now
  requires derived `EA`, `GJ`, `EIy`, `EIz` and all ten distinct positive
  length-scaled axial/torsion/bending block magnitudes to be finite and
  strictly positive. This rejects arithmetic overflow/underflow as
  `invalid-beam-property` without a conditioning threshold.
- invariant_hardening: production `normalizedMatrixError` now returns infinite
  error for any nonfinite operand, difference, scale, or quotient, so the
  two-point/closed-form `1e-12` invariant fails closed.
- analytical_hardening: every nonzero reference in existing `T16-BEAM-006`
  now checks `abs(actual-reference)/abs(reference) <= 1e-9`; only the explicitly
  zero free-end resultants retain an absolute check. This evidence-only change
  was expected to remain GREEN and its focused test passed without a production
  correction.
- convergence_hardening: existing `T16-BEAM-005` directly assembles aligned
  1/2/4-element `[v,rz]` cantilever systems from public `localStiffness()` and
  `localEquivalentLoad()` only. It checks each exact signed constant transverse
  element load, solves a test-only dense reduced system, and uses independent
  five-point integration of interior cubic-Hermite displacement error against
  the quartic uniform-load solution. Both refinements are monotone and each
  observed order is 4 within `1e-8`. No `DLOAD`, parser, Domain, or production
  assembly support was introduced. This evidence-only change was expected to
  remain GREEN and the T16-005/T16-006 focused run passed 2/2.

| stage | exact command | exit_code | observed_result |
| --- | --- | ---: | --- |
| FIX1-RED | `ctest --test-dir .harness/build -C Debug -R EulerBeam3D.RejectsInvalidGeometryAndProperties --output-on-failure` | 8 | 0/1 passed; unexpected acceptance exposed nonfinite and zero stiffness outcomes |
| FIX1-GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | corrected source and unchanged ten test names compiled under `/W4 /WX` without a warning |
| FIX1-GREEN-defect | `ctest --test-dir .harness/build -C Debug -R EulerBeam3D.RejectsInvalidGeometryAndProperties --output-on-failure` | 0 | 1/1 passed |
| FIX1-GREEN-evidence | `ctest --test-dir .harness/build -C Debug -R 'EulerBeam3D.(ConstantLineLoadMatchesAllSignedComponents|AnalyticalAxialTorsionAndTwoPlaneBendingRecover)' --output-on-failure` | 0 | 2/2 analytical/convergence hardening tests passed without another production change |
| FIX1-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 | exact MSVC x64 Debug tree configured and generated |
| FIX1-VERIFY-build | `cmake --build .harness/build --config Debug` | 0 | full Debug build completed without a new warning |
| FIX1-VERIFY-targeted | `ctest --test-dir .harness/build -C Debug -R EulerBeam3D --output-on-failure` | 0 | exact 10/10 passed |
| FIX1-VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | 39 total tests discovered, including the same ten EulerBeam3D names |
| FIX1-VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | 39/39 passed |
| FIX1-VERIFY-scans | fail-on-match numerical invariant, dependency, scope, exact-test-count, reference, phase-index, and diff/whitespace scans | 0 | derived rigidity/coefficient and fail-closed checks present; tests 10; leaks 0; reference and phase index unchanged; diff clean |

## Step 17 — parallel-for-tbb

- task_id: `TASK-17`
- status: `completed`
- changed_files: `include/fesa/assembly/parallel_for.hpp`,
  `src/fesa/assembly/parallel_for.cpp`,
  `tests/unit/assembly/parallel_for_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`,
  `.superpowers/sdd/linear-static-3d-euler-beam/task-17-report.md`
- requirement_ids: `FESA-REQ-LS3DEB-024`, `FESA-REQ-LS3DEB-025`,
  `FESA-REQ-LS3DEB-034`
- test_ids: `T17-PFOR-001`, `T17-PFOR-002`, `T17-PFOR-003`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly three planned tests were registered before production and the ParallelFor public API was absent | MSVC C1083 reported missing `fesa/assembly/parallel_for.hpp` from `parallel_for_test.cpp` after successful CMake regeneration |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal serial/oneTBB adapters, three tests, solver library, and unit executable compile and link | `parallel_for.cpp`, `parallel_for_test.cpp`, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX`; oneTBB runtime staged for discovery |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R ParallelFor --output-on-failure` | 0 | Zero/one/many exact-once, stable indexed output, and exception propagation pass | 3/3 exact `ParallelFor` 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 | Windows SDK, oneMKL 2026.1, oneTBB, and HDF5 resolved; configure and 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 ParallelFor --output-on-failure` | 0 | Focused Step 17 suite remains green | 3/3 exact `ParallelFor` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all three exact ParallelFor names | 42 tests discovered, including 3 `ParallelFor` tests, with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 42/42 tests passed |
| VERIFY-contract-scans | Public oneTBB leak, private include, forbidden scheduler/assembly scope, exact-test-count, and CMake-registration scans using fail-on-match/count `rg` wrappers | 0 | The backend-free adapter implements only independent indexed work and retains the default caller-scoped scheduler policy | public TBB leaks 0; forbidden global/sparse/reduction policy 0; private TBB includes 1; tests 3; registrations 1/1/1 |
| VERIFY-diff | `git diff --check` plus trailing-whitespace scan over the three new files | 0 | Tracked and untracked Step 17 files have no whitespace errors | Diff check exit 0; new-file trailing whitespace matches 0 |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: `ParallelFor`, `SerialParallelFor`, and `TbbParallelFor`
  expose only `std::size_t` and `std::function` in the public header. oneTBB
  headers/types remain private to `parallel_for.cpp`, and the normalized
  `Fesa::TBB` dependency is private to `fesa_solver`.
- contract_checks: both implementations execute `[0,count)` exactly once and
  make `count==0` a no-op. Deterministic result ordering is caller-owned:
  bodies write only their index-addressed slot, and this adapter performs no
  global sparse write, COO/CSR reduction, mutex, or atomic accumulation.
- contract_checks: serial and oneTBB execution preserve the original body
  exception type and message. oneTBB cancellation may allow already-running
  indexed work to finish; callers receive the rethrown exception and must not
  infer a deterministic partial-completion count.
- contract_checks: the adapter uses oneTBB's default caller-scoped scheduler;
  it creates no process-wide thread setting, `global_control`, or task arena,
  and does not override later MKL/TBB oversubscription coordination.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 18 can inject either backend for independent element-local
  computation into caller-owned stable element-order slots before its separate
  deterministic COO-to-CSR reduction.

### Step 17 Review Fix Round 1 — atomic test evidence

- classification: test-evidence reliability hardening; no production defect
  was observed or corrected.
- baseline_GREEN: before changing the test,
  `ctest --test-dir .harness/build -C Debug -R ParallelFor --output-on-failure`
  exited 0 with the existing production adapter passing 3/3. Because the
  review changes only how a test observes duplicate callbacks, no
  implementation-owned RED was expected or manufactured.
- reliability_issue: the prior `std::vector` scalar writes were race-free only
  if the exact-once contract was already true. A duplicate concurrent callback
  for one index could write the same non-atomic scalar concurrently, making the
  negative case undefined instead of a deterministic test failure.
- correction: T17-PFOR-001 now uses an explicitly initialized atomic zero-count
  counter and explicitly initialized per-index atomic visit counters.
  T17-PFOR-002 uses explicitly initialized atomic serial/TBB output slots plus
  per-index atomic visit counters. All callback increments use
  `fetch_add(1, memory_order_relaxed)` and post-execution assertions require
  every count to equal one, so duplicate same-index callbacks are observed
  without a data race. Output stores/loads are relaxed atomics because only
  per-slot observation is required after the blocking adapter returns.
- scope: only `tests/unit/assembly/parallel_for_test.cpp`, this cumulative
  Step 17 section, and the ignored `task-17-report.md` changed. Production,
  CMake, the phase index, upstream contracts, and reference artifacts were not
  modified in this review round; the exact three test names remain unchanged.

| stage | exact command | exit_code | observed_result |
| --- | --- | ---: | --- |
| REVIEW1-baseline-GREEN | `ctest --test-dir .harness/build -C Debug -R ParallelFor --output-on-failure` | 0 | existing correct production passed 3/3 before test hardening; no implementation RED expected |
| REVIEW1-VERIFY-build | `cmake --build .harness/build --config Debug` | 0 | C++17 atomic test evidence compiled and linked under MSVC `/W4 /WX` without a warning |
| REVIEW1-VERIFY-targeted | `ctest --test-dir .harness/build -C Debug -R ParallelFor --output-on-failure` | 0 | hardened exact three ParallelFor tests passed 3/3 |
| REVIEW1-VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | 42 tests discovered, including the unchanged three exact ParallelFor names |
| REVIEW1-VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | full accumulated suite passed 42/42 |
| REVIEW1-VERIFY-scans | public TBB leak, production scope, atomic reliability, reference, and diff/whitespace scans | 0 | public leaks 0; forbidden production scope 0; atomic vectors 5; relaxed duplicate counters 4; legacy non-atomic visit/output paths 0; reference unchanged; diff clean |

## Step 18 — sparse-assembly

- task_id: `TASK-18`
- status: `completed`
- changed_files: `include/fesa/math/sparse_matrix.hpp`,
  `src/fesa/math/sparse_matrix.cpp`,
  `include/fesa/assembly/sparse_assembler.hpp`,
  `src/fesa/assembly/sparse_assembler.cpp`,
  `tests/unit/math/sparse_matrix_test.cpp`,
  `tests/unit/assembly/sparse_assembler_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-024`, `FESA-REQ-LS3DEB-025`,
  `FESA-REQ-LS3DEB-034`, `FESA-REQ-LS3DEB-035`
- test_ids: `T18-SPARSE-001`, `T18-SPARSE-002`, `T18-SPARSE-003`,
  `T18-SPARSE-004`, `T18-SPARSE-005`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly five planned tests were registered before production and both sparse public APIs were absent | CMake regenerated, then MSVC C1083 reported missing `fesa/assembly/sparse_assembler.hpp` and `fesa/math/sparse_matrix.hpp` from the two new test files |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimum CSR owner, deterministic assembler, five tests, solver library, and unit executable compile and link | `sparse_assembler.cpp`, `sparse_matrix.cpp`, both tests, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R SparseAssembly --output-on-failure` | 0 | CSR validation/reduction/zero policy and serial/TBB deterministic beam assembly pass | 5/5 exact `SparseAssembly` 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 | Windows SDK, oneMKL 2026.1, oneTBB, and HDF5 resolved; configure and 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 SparseAssembly --output-on-failure` | 0 | Focused Step 18 suite remains green | 5/5 exact `SparseAssembly` 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 SparseAssembly names | 47 tests discovered, including 5 `SparseAssembly` tests, with feature/unit labels |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 47/47 tests passed |
| VERIFY-contract-scans | Public backend/upward-dependency/PARDISO, assembler shared-CSR-member, dense inheritance, exact-test-count, and CMake registration scans using fail-on-match/count `rg` wrappers | 0 | Sparse storage and reduction remain behind the exact approved boundaries | public backend leaks 0; math-header upward dependencies 0; PARDISO matches 0; assembler CSR-member writes 0; dense inheritance 0; tests 5; registrations 2/2 |
| VERIFY-determinism | Exact bytes, reversed completion, serial/TBB, repeated TBB, tuple-cancellation, structural-zero, empty-row, multiply, validation, and symmetry assertions in the targeted suite | 0 | NR-O02 fixed-order reduction and NR-T11 scheduler independence are observable | one serial, one TBB, one reverse-order, and eight repeated TBB assemblies produced byte-identical row/column/value vectors; duplicate cancellation produced the tuple-ordered literal `1.0` |
| VERIFY-diff | `git diff --check 59da6c6` | 0 | The combined base-to-current-worktree Step 18 tracked range has no whitespace errors | Exact tracked scope is 10 files; generated discovery JSON and ignored scratch report are absent from the range |
| VERIFY-reference | `git diff --exit-code -- reference/`; `git status --short -- reference/` | 0 | Approved legacy reference artifacts remain read-only and unchanged | Reference diff exit 0 and reference status empty |

- contract_checks: `SparseMatrix` is a separate owning CSR type with 0-based
  row offsets and sorted-unique columns. It validates row-offset shape/range,
  column range/order/uniqueness, COO dimensions, expected-pattern membership,
  finite inputs, finite ordered sums, and multiply dimensions. Empty rows and
  rectangular/zero structural layouts remain valid; every expected slot is
  emitted even when its exact stored value is zero.
- contract_checks: COO contributions are stable-sorted by exactly
  `(row,column,elementOrder,localOrder)` and duplicates are accumulated in
  that sequence. The cancellation fixture distinguishes tuple order from
  incoming vector order, and input permutation retains the same result.
- contract_checks: `SparseAssembler` validates model/DOF dimensions,
  element references, and scatter ownership before work. It invokes the
  injected `ParallelFor` once over stable active-element order; each worker
  writes only its caller-indexed 144-entry row-major local buffer and failure
  slot. CSR allocation and reduction occur only after the parallel call.
- contract_checks: the public headers expose no oneTBB, MKL, HDF5, or PARDISO
  type. `SparseMatrix` neither includes nor inherits dense `Matrix`; the math
  header forward-declares DofManager-owned `SparsePattern` to avoid a public
  upward include.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 19 can consume canonical full CSR arrays and deterministic
  matrix-vector multiplication without depending on dense storage, oneTBB,
  or a solver backend. Step 20 remains solely responsible for PARDISO
  descriptors, indexing conversion, factorization, and substitution.
- concerns: none; no implementation, environment, backend, or upstream
  contract conflict was found.

### Step 18 Review Fix Round 1 — evidence artifact scope

- classification: evidence/artifact-integrity correction only. Production,
  public headers, tests, CMake, upstream contracts, and phase-index content
  were not changed by this review fix.
- reproduced_finding: before correction,
  `git diff --check 59da6c6..HEAD` exited 2 with
  191 findings (382 output lines), all for trailing whitespace in tracked file
  `.harness/step18-discovery.json`. The cumulative `changed_files` list omitted
  that tracked file while listing ignored scratch file
  `.superpowers/sdd/linear-static-3d-euler-beam/task-18-report.md` as though it
  were tracked.
- correction: deleted the generated discovery JSON with `apply_patch` and
  reconciled `changed_files` to the exact 10-file combined tracked scope. The
  ignored scratch report remains supplementary evidence and is not listed as
  a tracked Step 18 file.
- phase_index_guard: `git hash-object
  phases/linear-static-3d-euler-beam/index.json` was
  `6808d3a8101f656e978b7e00df6cf1a4ad5f1711` before and after correction.

| stage | exact command | exit_code | observed_result |
| --- | --- | ---: | --- |
| REVIEW1-reproduce | `git diff --check 59da6c6..HEAD` | 2 | 191 findings (382 output lines), all for trailing whitespace, were isolated to the accidental tracked discovery JSON |
| REVIEW1-scope | `git diff --name-status 59da6c6` | 0 | Combined base-to-worktree scope contains exactly 10 tracked Step 18 files; discovery JSON and ignored scratch report are absent |
| REVIEW1-diff | `git diff --check 59da6c6` | 0 | Combined committed plus worktree Step 18 range is whitespace-clean after artifact deletion |
| REVIEW1-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 | Exact MSVC x64 dependency-resolved configuration completed |
| REVIEW1-build | `cmake --build .harness/build --config Debug` | 0 | Full Debug build completed under `/W4 /WX` without a new warning |
| REVIEW1-targeted | `ctest --test-dir .harness/build -C Debug -R SparseAssembly --output-on-failure` | 0 | Exact SparseAssembly suite passed 5/5 |
| REVIEW1-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated suite passed 47/47 |
| REVIEW1-reference | `git diff --exit-code 59da6c6 -- reference/`; `git status --short -- reference/` | 0 | Approved reference artifacts remain unchanged and reference status is empty |

## Step 19 — essential-constraints

- task_id: `TASK-19`
- status: `completed`
- changed_files: `include/fesa/constraints/essential_constraints.hpp`,
  `src/fesa/constraints/essential_constraints.cpp`,
  `tests/unit/constraints/essential_constraints_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-007`, `FESA-REQ-LS3DEB-022`,
  `FESA-REQ-LS3DEB-027`, `FESA-REQ-LS3DEB-034`,
  `FESA-REQ-LS3DEB-035`
- test_ids: `T19-CONSTRAINT-001`, `T19-CONSTRAINT-002`,
  `T19-CONSTRAINT-003`, `T19-CONSTRAINT-004`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly four planned tests were registered before production and the public constraint API was absent | MSVC C1083 reported missing `fesa/constraints/essential_constraints.hpp` from `essential_constraints_test.cpp` |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimum partition/mapping implementation and all four tests compiled and linked | `essential_constraints.cpp`, its test, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R EssentialConstraints --output-on-failure` | 0 | Hand-computed blocks, no/all/mixed constraints, nonzero reconstruction, and invalid dimensions passed | 4/4 exact `EssentialConstraints` 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 | Windows SDK, oneMKL 2026.1, oneTBB, and 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 EssentialConstraints --output-on-failure` | 0 | Focused Step 19 suite remains green | 4/4 exact `EssentialConstraints` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all four exact names | 51 tests discovered, including 4 `EssentialConstraints` tests |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 51/51 tests passed |
| VERIFY-contract-scans | Public backend and forbidden load/RHS/penalty/MPC scans, exact-test-count scan, `git diff --check`, and reference status/diff checks | 0 | Essential partition remains isolated behind backend-free public types | backend leaks 0; forbidden scope 0; exact tests 4; whitespace clean; reference unchanged |

- contract_checks: `partition` validates the input CSR, exact square/full-DOF
  dimensions, stable increasing free/constrained order, disjoint complete
  coverage, free-equation correspondence, and prescribed-vector size before
  extracting any block.
- contract_checks: each full CSR slot maps at most once into
  `Kff/Kfc/Kcf/Kcc`. Filtering the stable full rows and sorted columns retains
  numeric values, local row/column order, and exact structural zeros; every
  returned block revalidates through the canonical 0-based CSR constructor.
- contract_checks: no/all/mixed constraint cases include valid zero-sized
  rectangular blocks. `gatherFree`, `gatherConstrained`, and
  `reconstructFull` reject vector-size mismatch and preserve caller-supplied
  constrained values exactly, including nonzero prescribed displacement.
- contract_checks: the module does not assemble loads, form an effective RHS,
  implement penalty/MPC behavior, or expose MKL/oneTBB/HDF5/PARDISO types.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 20 may factorize the validated `kff`; Step 21 may use `kfc`
  with `DofManager::prescribedValues()` to form the nonzero prescribed
  effective RHS without changing this module's mapping responsibility.
- concerns: none; no critical implementation or upstream contract conflict
  was found.

## Step 20 — mkl-pardiso-solver

- task_id: `TASK-20`
- status: `completed`
- changed_files: `include/fesa/solvers/linear/linear_solver.hpp`,
  `include/fesa/solvers/linear/mkl_pardiso_solver.hpp`,
  `src/fesa/solvers/linear/mkl_pardiso_solver.cpp`,
  `tests/unit/solvers/linear/linear_solver_test.cpp`,
  `tests/unit/solvers/linear/mkl_pardiso_solver_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-025`, `FESA-REQ-LS3DEB-026`,
  `FESA-REQ-LS3DEB-034`, `FESA-REQ-LS3DEB-035`
- test_ids: `T20-PARDISO-001`, `T20-PARDISO-002`,
  `T20-PARDISO-003`, `T20-PARDISO-004`, `T20-PARDISO-005`,
  `T20-PARDISO-006`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly six planned tests were registered before production and both solver public APIs were absent | CMake regenerated with all dependencies resolved; MSVC C1083 reported missing `fesa/solvers/linear/linear_solver.hpp` and `fesa/solvers/linear/mkl_pardiso_solver.hpp` from the two new test files |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimum backend boundary, private PARDISO state, six tests, solver library, and unit executable compile and link | `mkl_pardiso_solver.cpp`, both tests, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R MklPardisoSolver --output-on-failure` | 0 | SPD solution, repeated RHS, refactorization, validation/failures, and conditioning behavior pass | 6/6 exact `MklPardisoSolver` 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 | Windows SDK 10.0.26100.0, oneMKL 2026.1 ILP64/dynamic, oneTBB, and 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 MklPardisoSolver --output-on-failure` | 0 | Focused Step 20 suite remains green | 6/6 exact `MklPardisoSolver` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all six exact names | 57 tests discovered, including 6 `MklPardisoSolver` tests |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 57/57 tests passed |
| VERIFY-contract-scans | Fail-on-match public-header scan for `mkl.h`, `MKL_INT`, `pardiso`, oneTBB, and HDF5 symbols; exact-test-count, `git diff --check`, and reference diff/status checks | 0 | The solver backend remains private and Step scope/artifact invariants hold | public PARDISO leaks 0; solver-header backend leaks 0; exact tests 6; whitespace clean; reference unchanged |

- contract_checks: `LinearSolver` exposes only the exact separate
  `factorize(SparseMatrix)` and const `solve(rhs,solution)` boundary.
  `MklPardisoSolver` exposes only its constructor, virtual destructor,
  overrides, and `unique_ptr<Impl>`; every MKL header/type/handle is confined
  to the `.cpp` and private `Impl`.
- contract_checks: factorization first validates the full square, nonempty,
  finite, sorted-unique public CSR, full symmetric structure/value tolerance,
  every diagonal slot, and all `size_t` to `MKL_INT` conversions. It then
  copies only the sorted upper triangle while retaining exact structural-zero
  diagonals.
- contract_checks: the private adapter uses real SPD `mtype=2`, explicit
  phases `11`, `22`, `33`, and `-1`, `iparm[26]=1` matrix checking, and
  `iparm[34]=1` zero-based indexing. A successful factorization is retained
  for repeated RHS; refactorization and destruction release the previous
  PARDISO state through the same RAII path. No regularization or fallback is
  present.
- contract_checks: solve-before-factorize, RHS/solution dimension mismatch,
  nonfinite RHS/solution, nonsquare/empty/asymmetric/missing-diagonal input,
  singular or indefinite SPD failure, checker/integer/backend errors, and
  phase-specific `-4`/`-7` failures return one deterministic
  `FailureCategory::solver` diagnostic. The known SPD system meets normalized
  residual `1e-10` and relative analytical error `1e-9`; common-scale and
  stiffness-ratio sweeps either meet both limits or return the structured
  solver failure without adding a conditioning threshold.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 21 can form the effective free RHS after this adapter has
  factorized `Kff`, then call `solve` repeatedly without refactorization or
  depending on MKL types.
- concerns: none; no critical implementation, environment, backend, or
  upstream-contract conflict was found.

### Step 20 Review Fix Round 1 — fully constrained lifecycle and normalized validation

- review_classification: Important integration/correctness fixes. Step 19
  intentionally produces a valid `0x0 Kff` for an all-constrained model, so
  rejecting that matrix contradicted the accumulated solver workflow.
- test_scope: the existing six `MklPardisoSolver` test names were retained.
  The invalid-state test now covers trivial factorize/solve followed by a
  nonempty refactor, unchanged caller output on failed solves, and a
  small-scale asymmetric matrix. Numerical helpers now divide by the actual
  nonzero RHS/expected norm and fail closed for zero or nonfinite norms.

| stage | exact command | exit_code | observed_result |
| --- | --- | ---: | --- |
| RED-zero-equation | `cmake --build .harness/build --config Debug; ctest --test-dir .harness/build -C Debug --output-on-failure -R MklPardisoSolver` | 1 | Build passed; 5/6 tests passed and `RejectsInvalidCsrStateAndDimensions` failed because valid `0x0 Kff` factorization returned failure |
| TEST-hardening | same targeted command after replacing unit-floor norm helpers | 1 | The same zero-equation production defect remained the only failure; no artificial RED was claimed for already-correct numerical results |
| GREEN-zero-equation | same targeted command after the minimum production change | 0 | 6/6 passed; empty factorize/solve avoids PARDISO and a following nonempty refactor solves correctly |
| RED-scaled-symmetry | `cmake --build .harness/build --config Debug; ctest --test-dir .harness/build -C Debug --output-on-failure -R MklPardisoSolver` | 1 | Build passed; 5/6 tests passed and the existing invalid-state test showed that a scaled asymmetric matrix was incorrectly accepted |
| GREEN-scaled-symmetry | same targeted command after the minimum production change | 0 | 6/6 passed with symmetry normalized by the matrix's actual maximum absolute entry and no unit-size floor |
| 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 | Explicit MSVC x64 dependencies configured and generated successfully |
| VERIFY-build/targeted | `cmake --build .harness/build --config Debug; ctest --test-dir .harness/build -C Debug --output-on-failure -R MklPardisoSolver` | 0 | Debug build completed without a new warning; exact Step 20 suite passed 6/6 |
| VERIFY-discovery/full | `ctest --test-dir .harness/build -C Debug --show-only=json-v1; ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | 57 tests discovered and 57/57 passed |
| VERIFY-contract | backend API leak scan, exact-test count, forbidden fallback/regularization scan, `git diff --check`, and reference diff/status | 0 | backend API leaks 0; exact tests 6; forbidden implementation matches 0; whitespace clean; `reference/` unchanged |

- production_fix: a successful zero-equation factorization is represented as
  trivial private state without allocating or calling PARDISO; empty solve
  succeeds only after that observable factorization. The ordinary `release()`
  path safely clears this state before later refactorization or destruction.
- production_fix: symmetry requires every reverse structural pair and compares
  `abs(aij-aji)` to `1e-12 * max(abs(A))`. An exactly zero matrix uses an exact
  zero difference check; SparseMatrix validation remains responsible for
  rejecting nonfinite values.
- failure_atomicity: solve-before-factorize, dimension mismatch, and nonfinite
  RHS failures are asserted to leave the caller's solution values unchanged;
  successful backend output is still copied from a private candidate only
  after phase 33 and finite-result validation.
- evidence_hygiene: two intermediate symmetry RED attempts were discarded
  because a concurrent clean build locked MSBuild files. The uncontended RED
  above reproduced the production defect deterministically and is the recorded
  evidence.
- phase_index: intentionally unchanged during this review fix; hash
  `2cfb6ee5e0c49fbf6b06d27cb33ec9ac2c34dbc4`.
- supersession: this review section supersedes the original Step 20 statements
  that the factorized CSR must be nonempty or that empty input is rejected.
- concerns: none; the transient build contention was resolved before recorded
  RED/GREEN/VERIFY runs and no critical or upstream blocker remains.

## Step 21 — load-assembly

- task_id: `TASK-21`
- status: `completed`
- changed_files: `include/fesa/assembly/load_assembler.hpp`,
  `src/fesa/assembly/load_assembler.cpp`,
  `tests/unit/assembly/load_assembler_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-007`, `FESA-REQ-LS3DEB-011`,
  `FESA-REQ-LS3DEB-027`, `FESA-REQ-LS3DEB-034`
- test_ids: `T21-LOAD-001`, `T21-LOAD-002`, `T21-LOAD-003`,
  `T21-LOAD-004`, `T21-LOAD-005`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly five planned tests were registered before production and the public load API was absent | MSVC C1083 reported missing `fesa/assembly/load_assembler.hpp` from `load_assembler_test.cpp` |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimum nodal load/effective RHS implementation and all five tests compiled and linked | `load_assembler.cpp`, its test, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R LoadAssembly --output-on-failure` | 0 | Node/set loads, source-order accumulation, nonzero prescribed RHS, rejection, and zero cases pass | 5/5 exact `LoadAssembly` 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 | Windows SDK 10.0.26100.0, oneMKL 2026.1 ILP64/dynamic, oneTBB, and 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 LoadAssembly --output-on-failure` | 0 | Focused Step 21 suite remains green | 5/5 exact `LoadAssembly` 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 names | 62 tests discovered, including 5 `LoadAssembly` tests |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 62/62 tests passed |
| VERIFY-contract-scans | Exact-test-count, public-backend, factorization/solve/distributed-load, whitespace, and reference diff/status scans | 0 | Load/RHS scope and backend boundary remain isolated | exact tests 5; public backend leaks 0; forbidden scope 0; whitespace clean; reference unchanged |

- contract_checks: semantic node label/node-set targets resolve case-insensitively
  to unique stable node indices. All six global components use DofManager full
  order, constrained loads remain in the full vector, and duplicate CLOAD rows
  accumulate strictly in active source order; a cancellation fixture proves
  that the implementation does not reorder floating-point additions.
- contract_checks: model/full/free/constrained/prescribed dimensions, stable
  DOF partition/equation order, active-load order, target indices, component
  range, and finite individual inputs are validated before use. Nonfinite
  source-order load sums, `Kfc*dc` products/row sums, and final subtraction fail
  closed with one structured model diagnostic.
- contract_checks: effective RHS is exactly the stable gather of `Ff` minus
  CSR row-order `Kfc*dc`; hand-computed nonzero `dc`, zero-load, zero-free, and
  zero-constrained cases pass. No factorization/substitution call, distributed
  load object, `*DLOAD`, or line-load behavior was added.
- contract_checks: the public header exposes only the two approved static
  `LoadAssembler` functions and no MKL, oneTBB, HDF5, or PARDISO type.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 22 can consume the full external force and effective free RHS;
  Step 24 retains ownership of factorize-before-load orchestration,
  substitution, reconstruction, recovery, and output sequencing.
- concerns: none; no critical implementation, environment, backend, or
  upstream-contract conflict was found.

## Step 22 — result-recovery

- task_id: `TASK-22`
- status: `completed`
- changed_files: `include/fesa/results/result_recovery.hpp`,
  `src/fesa/results/result_recovery.cpp`,
  `tests/unit/results/result_recovery_test.cpp`, `src/fesa/CMakeLists.txt`,
  `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-004`, `FESA-REQ-LS3DEB-027`,
  `FESA-REQ-LS3DEB-031`, `FESA-REQ-LS3DEB-032`,
  `FESA-REQ-LS3DEB-034`, `FESA-REQ-LS3DEB-035`,
  `FESA-REQ-LS3DEB-042`
- test_ids: `T22-RECOVERY-001`, `T22-RECOVERY-002`,
  `T22-RECOVERY-003`, `T22-RECOVERY-004`, `T22-RECOVERY-005`,
  `T22-RECOVERY-006`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exactly six planned tests were registered before production and the recovery public API was absent | MSVC C1083 reported missing `fesa/results/result_recovery.hpp` from `result_recovery_test.cpp` |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Recovery, station normalization, six tests, solver library, and unit executable compile and link | `result_recovery.cpp`, its test, `fesa_solver.lib`, and `fesa_unit_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-test | `ctest --test-dir .harness/build -C Debug -R ResultRecovery --output-on-failure` | 0 | Residual reaction, residual criterion, distinct result types, signs, stress order, and station policy pass | 6/6 exact `ResultRecovery` tests passed |
| RED-state-consistency | `cmake --build .harness/build --config Debug --target fesa_tests; ctest --test-dir .harness/build -C Debug -R ResultRecovery.EnforcesNormalizedFreeResidual --output-on-failure` | 1 | A constrained displacement inconsistent with prescribed `dc` must fail before residual evaluation | Test expected `invalid-recovery-state` but observed later `free-residual-tolerance-failure`, proving missing prevalidation |
| GREEN-state-consistency | same focused build/test command after the minimum validation change | 0 | Prescribed-order/state consistency fails before recovery and the exact zero-load/zero-displacement equilibrium remains valid | Focused test passed; subsequent exact suite passed 6/6 |
| 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 | Windows SDK 10.0.26100.0, oneMKL 2026.1 ILP64/dynamic, oneTBB, and 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 ResultRecovery --output-on-failure` | 0 | Focused Step 22 suite remains green | 6/6 exact `ResultRecovery` tests passed |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | CTest discovers the accumulated suite and all six exact names | 68 tests discovered, including 6 `ResultRecovery` tests |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 68/68 tests passed |
| VERIFY-contract-scans | Exact-test-count, public-backend, forbidden shear/averaging, whitespace, and reference diff/status scans | 0 | Recovery scope and adapter/reference boundaries remain isolated | exact tests 6; public backend leaks 0; forbidden scope 0; whitespace clean; reference unchanged |

- contract_checks: full `internalForce=K*d` and
  `residual=internalForce-externalForce` are computed as private candidates;
  the full residual is preserved in reaction so free residual evidence remains
  visible and constrained entries are the physical support reactions. No
  endpoint-action summation participates in reaction recovery.
- contract_checks: the free residual uses
  `||r_f||/max(||Fint_f||,||Fext_f||)` with no unit floor. A positive physical
  denominator must meet `1e-10`; exact zero numerator/denominator is accepted
  as zero-load equilibrium, while nonfinite arithmetic fails closed.
- contract_checks: dimensions, finite input, stable free/constrained order,
  exact prescribed displacement, active entity references, and twelve-DOF
  scatters are checked before computing candidates. Internal/residual/reaction
  vectors and endpoint/Gauss/stress rows replace AnalysisState only after all
  elements recover finite results, so failure is atomic.
- contract_checks: active element order produces endpoint `0,1`, Gauss `1,2`,
  and element/Gauss/section stress order. Equilibrium end action
  `[FX,FY,FZ,MX,MY,MZ]`, endpoint `[N,T,My,Mz]`, Gauss strain/resultant, and
  section-point/default-centroid `S11` remain distinct.
- contract_checks: node-station projection requires exact endpoint row
  identity, a two-endpoint unloaded interior chain, identical section and
  local axes, finite component tolerances `[N,T,My,Mz]`, and agreement before
  selecting the smaller stable element ID. Positive-local-x section-cut rows
  compare directly and are never averaged; reversed, branched, loaded,
  section-jump, nonfinite, and mismatch cases fail structurally.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa_solver.lib`,
  `.harness/build/tests/Debug/fesa_unit_tests.exe`
- reference_diff: unchanged; `git diff --exit-code -- reference/` exit 0
- handoff: Step 23 can serialize the stable nodal vectors and distinct
  endpoint/Gauss/stress rows; Step 24 reference tooling can reuse
  `normalizeSectionResultantsToNodeStations` without backend or HDF5 types.
- concerns: none; no critical implementation, environment, numerical, or
  upstream-contract conflict was found.

### Step 22 Review Fix Round 1 — full-space free-residual visibility

- review_trigger: the approved I/O contract requires Reaction at every node
  and component, including the accepted free-DOF residual; the AnalysisState
  storage comment likewise makes reaction a full-index residual view.
- RED-test: `cmake --build .harness/build --config Debug --target fesa_tests;
  ctest --test-dir .harness/build -C Debug -R
  '^ResultRecovery.EnforcesNormalizedFreeResidual$' --output-on-failure`
  built successfully and exited 1 in CTest. The accepted below-tolerance free
  residual was `-1.000000082740371e-09`, while its reaction entry was `0`.
- production_fix: the private reaction candidate is now a full copy of
  `residual=K*d-F`. Constrained entries remain the physical reactions, free
  entries retain residual evidence, and element end actions are still never
  summed into reaction.
- GREEN-focused: the same focused build/test command exited 0 and passed 1/1
  after the minimum production change.
- VERIFY-build: `cmake --build .harness/build --config Debug` exited 0 under
  MSVC x64 Debug with no new FESA warning.
- VERIFY-targeted: `ctest --test-dir .harness/build -C Debug -R
  ResultRecovery --output-on-failure` exited 0 and passed the unchanged exact
  six names 6/6.
- VERIFY-discovery-full: `ctest --test-dir .harness/build -C Debug
  --show-only=json-v1` discovered 68 tests, exactly six ResultRecovery tests;
  full `ctest --test-dir .harness/build -C Debug --output-on-failure` exited 0
  and passed 68/68.
- failure_atomicity: the existing tolerance-failure branch in
  `ResultRecovery.EnforcesNormalizedFreeResidual` still proves prior internal,
  residual, reaction, and endpoint state remains unchanged on failure.
- supersession: this review section records the historical pre-fix finding
  that implementation and report originally kept only constrained residual
  entries. The final Step 22 contract above now states that reaction is the
  full residual dataset; only constrained entries are physical reactions.
- phase_index: the review-fix worker intentionally left phase metadata
  unchanged. After independent root verification, finalization preserved exact
  `started_at=2026-08-09T20:42:15+0900`, added
  `completed_at=2026-08-09T21:14:47+0900`, and updated the summary to state
  the corrected full-residual reaction contract.
- evidence_hygiene: an initial parallel VERIFY/audit wrapper terminated before
  product commands because its PowerShell count expression was malformed. It
  is excluded from TDD and product VERIFY evidence; the recorded evidence is
  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.

## Step 24 — linear-static-cli

- task_id: `TASK-24`
- status: `completed`
- changed_files: `include/fesa/analysis/linear_static_analysis.hpp`,
  `src/fesa/analysis/linear_static_analysis.cpp`,
  `include/fesa/app/fesa_application.hpp`,
  `src/fesa/app/fesa_application.cpp`, `src/fesa/app/main.cpp`,
  `tests/integration/analysis/linear_static_analysis_test.cpp`,
  `tests/integration/app/fesa_application_test.cpp`,
  `tests/reference/reference_comparison.hpp`,
  `tests/reference/reference_comparison.cpp`,
  `tests/reference/reference_comparison_test.cpp`,
  `tests/reference/b33_reference_comparison_test.cpp`,
  `src/fesa/CMakeLists.txt`, `tests/CMakeLists.txt`,
  `docs/implementation-plans/linear-static-3d-euler-beam-implementation-report.md`,
  `phases/linear-static-3d-euler-beam/index.json`
- requirement_ids: `FESA-REQ-LS3DEB-001`, `FESA-REQ-LS3DEB-002`,
  `FESA-REQ-LS3DEB-005`, `FESA-REQ-LS3DEB-020`,
  `FESA-REQ-LS3DEB-026`, `FESA-REQ-LS3DEB-028`,
  `FESA-REQ-LS3DEB-030`, `FESA-REQ-LS3DEB-032`,
  `FESA-REQ-LS3DEB-033`, `FESA-REQ-LS3DEB-034`,
  `FESA-REQ-LS3DEB-036` through `FESA-REQ-LS3DEB-044`
- test_ids: `T24-ORCH-001`, `T24-ORCH-002`, `T24-CLI-001`,
  `T24-CLI-002`, `T24-CLI-003`, `T24-REF-001`, `T24-REF-002`,
  `T24-REF-003`, `T24-REF-004`, `T24-B33-001`

| stage | exact command | exit_code | expected_or_observed_result | evidence_tail |
| --- | --- | ---: | --- | --- |
| RED-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 1 | Exact ten tests were registered while orchestration, CLI, and comparator APIs were absent | MSVC C1083 reported only missing `fesa/analysis/linear_static_analysis.hpp`, `fesa/app/fesa_application.hpp`, and `reference_comparison.hpp`; the pre-existing unit target still built |
| RED-targeted | `ctest --test-dir .harness/build -C Debug -R "LinearStaticCli|ReferenceComparisonContract|B33ReferenceComparison" --output-on-failure` | 0 | Missing executables leave no runnable Step 24 tests after the valid compile RED | CTest reported `No tests were found`; this is secondary evidence, not the RED acceptance result |
| GREEN-build | `cmake --build .harness/build --config Debug --target fesa_tests` | 0 | Minimal production lifecycle, application boundary, test-only comparator, and all three test executables compile/link | `fesa_solver.lib`, `fesa_unit_tests.exe`, `fesa_integration_tests.exe`, and `fesa_reference_tests.exe` built without a FESA warning under `/W4 /WX` |
| GREEN-targeted | `ctest --test-dir .harness/build -C Debug -R "LinearStaticCli|ReferenceComparisonContract|B33ReferenceComparison" --output-on-failure` | 0 | Exact lifecycle/CLI/reference contract is green | Exact Step 24 suite passed 10/10: integration 5 and reference 5 |
| 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 2026.1, oneTBB, and shared HDF5 resolved |
| VERIFY-build | `cmake --build .harness/build --config Debug` | 0 | Full Debug build includes the actual CLI and all test executables | `.harness/build/src/fesa/Debug/fesa.exe` built under `/W4 /WX`; selected MKL/TBB/HDF5/Intel runtime DLLs were staged beside it |
| VERIFY-targeted | `ctest --test-dir .harness/build -C Debug -R "LinearStaticCli|ReferenceComparisonContract|B33ReferenceComparison" --output-on-failure` | 0 | Focused Step 24 suite remains green after the full build | Exact tests passed 10/10 |
| VERIFY-discovery | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` plus JSON count audit | 0 | All accumulated and exact Step 24 tests are discovered | 83 total tests, exactly 10 Step 24 names |
| VERIFY-full | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | Full accumulated C++ suite has zero failures | 83/83 tests passed |
| VERIFY-cli | `.harness/build/src/fesa/Debug/fesa.exe "reference/cantilever beam/cantilever beam.inp" --output .harness/build/cli-smoke-step24/results.h5` | 0 | The actual executable strips argv[0], runs the approved pipeline, and writes HDF5 | Process exit 0; `results.h5` exists and is 25,336 bytes; an empty-argument process smoke test returned exact usage exit 2 |
| VERIFY-determinism | Run exact `B33ReferenceComparison` twice and hash `comparison.json` after each run | 0 | Build-local comparison evidence is byte deterministic | Both runs passed 1/1 and produced SHA-256 `258347AEA791D981AEA9B2BCAD85DE5344D4859ECA3692DC5E7AA01A848F8E0D` |
| VERIFY-contract-scans | Exact-test count, public-backend, forbidden-scope, reference-write, whitespace, and reference diff/status scans | 0 | Approved module and artifact boundaries remain isolated | exact tests 10; public backend leaks 0; B31/DLOAD/fallback/averaging scope 0; comparator has only its JSON output writer; diff clean; reference unchanged |

- contract_checks: `Analysis::run` invokes the exact eight hook stages and
  returns immediately on failure. `LinearStaticAnalysis` keeps the immutable
  Domain alive under the non-owning AnalysisModel, owns the DOF/state/matrix
  handoff, and calls `factorize(Kff)` before any nodal load assembly. Solve is
  substitution-only, followed by full reconstruction, recovery, and the
  injected ResultsWriter.
- contract_checks: `FesaApplication::run` receives argv[0]-excluded operands,
  accepts only `<input>` or `<input> --output <output>`, defaults to the current
  directory `results.h5`, constructs TBB/MKL/HDF5 adapters behind their public
  boundaries, emits seven deterministic diagnostic fields, and returns exact
  process codes 0/2/3/4/5/6. Domain warnings remain in the HDF5 diagnostics and
  output requests do not filter mandatory result datasets.
- contract_checks: the test-only comparator opens the exact legacy four-file
  bundle and authoritative HDF5 read-only, requires B33/schema/source/row
  identity/finite values before comparison, and produces exactly 176 stable
  decisions plus 16 component metrics. It uses Abaqus-only component scales,
  exact SI floors, no zero clamp/drop, and Step 22 endpoint consistency before
  selecting the smaller element identity without averaging.
- generated_evidence: `.harness/build/src/fesa/Debug/fesa.exe`,
  `.harness/build/reference/cantilever-beam-b33/results.h5` (25,336 bytes),
  `.harness/build/reference/cantilever-beam-b33/comparison.json` (128,118
  bytes). The report has `passed=true`, 0 failed rows, 176 matched rows, 16
  metrics, stress comparison N/A, and worst normalized error
  `0.026602795021994977` (`UZ`).
- physics_evidence: free residual norm `9.356339321107032e-7`; applied force
  `[0,0,-1000000]`; reaction force `[0,0,999999.9999998808]`; applied moment
  about origin `[0,10000000,0]`; reaction moment about origin
  `[0,-9999999.999997258,0]`; endpoint consistency passed.
- reference_diff: unchanged; `git diff --exit-code -- reference/` and
  `git status --short -- reference/` both report no change. Contract-fixture
  mutations occur only under `.harness/build/reference/contract-fixtures/`.
- handoff: Step 25 can independently rebuild and execute all 83 tests. Step 26
  can rerun the already-built exact B33 CTest and consume the deterministic
  `comparison.json` without changing source, tests, tolerances, or references;
  Step 27 can consume only its `physics_evidence` after Step 26 passes.
- concerns: none; no critical implementation, environment, numerical, or
  upstream-contract blocker remains.

### Step 24 Review Fix Round 1 — option-token output rejection

- review_trigger: the approved CLI contract classifies repeated `--output`
  and every unknown option as usage error exit 2. The original three-argument
  parser treated the value position as an arbitrary nonempty path, so an
  option token could advance into input analysis instead.
- RED-repeated-option: after adding
  `{missingInput,"--output","--output"}` to the existing exact
  `LinearStaticCli.ReturnsEveryExactExitCodeAndOrderedDiagnostic` test,
  `cmake --build .harness/build --config Debug --target
  fesa_integration_tests` exited 0 and the focused CTest exited 1. Actual exit
  was 3 and stderr contained no `cli-usage`, rather than expected exit 2.
- GREEN-repeated-option: rejecting the literal repeated token made the same
  focused test pass 1/1.
- RED-unknown-option: the reviewer then identified the general unknown-option
  case. Adding `{missingInput,"--output","--bogus"}` before broadening the
  production condition again produced build exit 0 and focused CTest exit 1;
  actual exit was 3 with no `cli-usage`.
- production_fix: explicit output form now requires a nonempty third argument
  that does not begin with `-`. Both a repeated known option and an unknown
  option token are rejected before any input or output access, while ordinary
  output paths retain the approved behavior.
- GREEN-focused: rebuilding `fesa_integration_tests` exited 0 under `/W4 /WX`;
  the unchanged exact focused test passed 1/1 with both option cases pinned.
- independent_review: Critical 0, unresolved Important 0. The reviewer reran
  exact Step 24 10/10, discovery 83, full 83/83, comparison 176 rows/16
  metrics passed, and reference diff/status clean.
- remaining_minor: the test-only comparator independently pins float64 result
  file types but relies on the Step 23 writer self-check/full-suite schema test
  for exact uint64 endianness and every compound member file dtype/UTF-8. This
  is defense-in-depth negative coverage, not a reproducible approved-pipeline
  false pass.
- remaining_minor: the inherited diagnostic sorter is not a literal
  implementation of future multi-source declaration/internal-ID ordering, but
  no V0 single-input CLI misordering is reproducible.
- remaining_minor: the Step 23 `libmmd.dll` guard remains unconditional across
  alternate HDF5 targets; it is correct for the approved shared-HDF5
  environment and is an external portability limitation.
