docs: record MITC4 verification gates

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 # Linear Static MITC4 Shell Build/Test Report
 ## Metadata
 - feature_id: `linear-static-mitc4-shell`
 - source_commit: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
 - source_implementation_report: `N/A`; Harness completion evidence is recorded in
  `phases/linear-static-mitc4-shell/index.json`
 - source_implementation_plan:
  `docs/implementation-plans/linear-static-mitc4-shell-implementation-plan.md`
 - status: `pass-for-reference-verification`
 - owner_agent: `build-test-executor-agent`
 - date: `2026-08-13`
 ## Verdict
 The formal build/test gate passes. A fresh Visual Studio 18 2026/MSVC x64 Debug
 configuration, clean full rebuild, three implementation-plan-focused CTest runs,
 nonzero JSON discovery, full CTest regression, and the required Harness Python
 self-test all completed successfully.
 - clean full rebuild: exit `0`; compiler/linker warning scan `0`; error scan `0`
 - focused kernel/model/assembly/recovery regex: `87/87` passed
 - focused linear-static lifecycle regex: `10/10` passed
 - focused MITC4 reference-test regex: `8/8` passed
 - CTest discovery: `144` tests, including `32` names containing `Mitc4`
 - full CTest after clean rebuild: `144/144` passed
 - Harness Python self-test: `7/7` passed
 - failed tests: `0`
 - required S4 reference hash mismatches or Git changes: `0`
 This verdict authorizes handoff to Reference Verification only. It does not approve
 reference tolerance results, physics sanity, or release readiness.
 ## Execution Environment
 - os: `Microsoft Windows 11 Home 10.0.26200 build 26200`
 - branch: `feat-linear-static-mitc4-shell`
 - source_head: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
 - generator: `Visual Studio 18 2026`
 - MSBuild: `18.8.2+ce25c0108`
 - compiler: `MSVC 19.51.36252.0`
 - compiler_architecture: `x64`
 - Windows SDK: `10.0.26100.0`
 - language/config: `C++17 / Debug`
 - CMake: `4.4.0`
 - build_dir: `.harness/build`
 - harness_config: absent
 - project_selection: auto CMake from root `CMakeLists.txt`
 - command_discovery_path: default CMake/MSVC x64 Debug with implementation-plan
  generator and dependency paths
 - resolved dependencies: GoogleTest `C:/git/googletest`; oneMKL `2026.1.0`;
  oneTBB package path `2023.1`; HDF5 package path `2.1.1`
 The generated compiler metadata at
 `.harness/build/CMakeFiles/4.4.0/CMakeCXXCompiler.cmake` independently confirms
 `CMAKE_CXX_COMPILER_ID=MSVC` and version `19.51.36252.0`.
 ## Command Log Summary
 All durations below are wall-clock durations measured for the command. The initial
 green chain was retained as corroborating evidence; the later clean-rebuild chain is
 the canonical acceptance evidence.
 | order | command | exit_code | duration | relevant stdout/stderr tail |
 | ---: | --- | ---: | ---: | --- |
 | 1 | `git status --short --branch; git rev-parse HEAD` | 0 | `0.8 s` | Clean `feat-linear-static-mitc4-shell`; HEAD matched `820ba30...`. |
 | 2 | Required dependency `Test-Path` precheck from the implementation plan | 0 | `0.215 s` | All four GoogleTest/MKL/TBB/HDF5 paths returned `True`. |
 | 3 | `cmake --fresh -S . -B .harness/build -G "Visual Studio 18 2026" -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 | `8.684 s` | MSVC `19.51.36252.0`, MKL `2026.1.0`; `Configuring done`, `Generating done`. The failed pthread probes were normal CMake feature probes; `Found Threads: TRUE`. |
 | 4 | `cmake --build .harness/build --config Debug` | 0 | `4.382 s` | Initial incremental build produced `fesa.exe` and all three test executables; warning/error scan `0/0`. |
 | 5 | `ctest --test-dir .harness/build -C Debug -R "DomainModel|InpDomainMapping|Mitc4Geometry|Mitc4Shell|DofManager|EssentialConstraints|SparseAssembly|LoadAssembly|ResultRecovery|Hdf5ResultsWriter" --output-on-failure` | 0 | `5.743 s` | `100% tests passed out of 87`; failed `0`. |
 | 6 | `ctest --test-dir .harness/build -C Debug -R "LinearStaticCli|Mitc4ShellCli" --output-on-failure` | 0 | `1.442 s` | `100% tests passed out of 10`; failed `0`. |
 | 7 | `ctest --test-dir .harness/build -C Debug -R "Mitc4ReferenceComparison|Mitc4S4Reference" --output-on-failure` | 0 | `1.377 s` | `100% tests passed out of 8`; failed `0`. |
 | 8 | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | `0.208 s` | Discovered `144` tests; `32` test names contained `Mitc4`. |
 | 9 | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | `9.789 s` | Initial full regression: `144/144` passed; failed `0`. |
 | 10 | First environment/reference audit helper | 1 | `0.9 s` | Non-gating report-generation error: it hardcoded nonexistent CMake internal directory `CMakeFiles/4.3.0`; both S4 hashes had already matched before the helper stopped. No build or test failed. |
 | 11 | Corrected dynamic environment/reference audit helper | 0 | `0.583 s` | Located `CMakeFiles/4.4.0/CMakeCXXCompiler.cmake`; confirmed MSVC/version, both S4 hashes, no S4 diff, and clean worktree. |
 | 12 | `cmake --build .harness/build --config Debug --target clean` | 0 | `1.251 s` | Generated Visual Studio clean target completed. |
 | 13 | `cmake --build .harness/build --config Debug` | 0 | `94.616 s` | Canonical clean rebuild compiled/linked the solver, CLI, and all test executables; `89` output lines, warning scan `0`, error scan `0`. |
 | 14 | `cmake --build .harness/build --config Debug --target fesa_unit_tests` | 0 | `1.943 s` | `fesa_solver`, GoogleTest, and `fesa_unit_tests.exe` confirmed. |
 | 15 | Focused kernel/model/assembly/recovery regex from order 5 | 0 | `4.863 s` | Canonical focused run: `87/87` passed; failed `0`. |
 | 16 | `cmake --build .harness/build --config Debug --target fesa_integration_tests` | 0 | `1.712 s` | `fesa_solver`, GoogleTest, and `fesa_integration_tests.exe` confirmed. |
 | 17 | Focused lifecycle regex from order 6 | 0 | `1.531 s` | Canonical focused run: `10/10` passed; failed `0`. |
 | 18 | `cmake --build .harness/build --config Debug --target fesa_reference_tests` | 0 | `1.769 s` | `fesa_solver`, GoogleTest, and `fesa_reference_tests.exe` confirmed. |
 | 19 | Focused reference regex from order 7 | 0 | `1.511 s` | Canonical focused run: `8/8` passed; failed `0`; S4 end-to-end tests were included. |
 | 20 | `ctest --test-dir .harness/build -C Debug --show-only=json-v1` | 0 | `0.080 s` | Canonical discovery: `144` total, `32` MITC4-named; unit/integration/reference labels `121/10/13`. |
 | 21 | `ctest --test-dir .harness/build -C Debug --output-on-failure` | 0 | `9.669 s` | Canonical full regression: `100% tests passed out of 144`; failed `0`; CTest real time `9.62 s`. |
 | 22 | Full `reference/` Git scope and worktree audit | 0 | `0.362 s` | `reference_diff_count=0`, `reference_status_count=0`; branch and HEAD unchanged. |
 | 23 | `git merge-base dev HEAD` plus changed-file scope audit | 0 | `0.321 s` | Merge base `a058ef7...`; detected `scripts/execute.py`, so Harness Python self-test was required. |
 | 24 | `uv run --with pytest python -m pytest -v -rs` | 0 | `4.651 s` | Python `3.11.15`, pytest `9.1.1`; `7 passed in 0.11s`; failed `0`. |
 ## Validation Results
 | validation_stage | result | evidence |
 | --- | --- | --- |
 | clean baseline | pass | Branch and HEAD matched the requested baseline; worktree was clean before report creation. |
 | dependency precheck | pass | All four implementation-plan dependency paths existed. |
 | fresh configure | pass | VS18/x64 configure exit `0`; compiler metadata is MSVC x64. |
 | clean full build | pass | Exit `0`; solver, CLI, unit, integration, and reference targets compiled/linked. |
 | compiler warning policy | pass | Clean rebuild emitted zero warning lines and zero compiler/linker error lines; product CMake uses warnings-as-errors. |
 | feature-specific tests | pass | Approved focused regexes passed `87/87`, `10/10`, and `8/8`. |
 | CTest discovery | pass | Nonzero inventory: `144` tests, including `32` MITC4-named tests. |
 | full CTest | pass | `144/144` passed after the clean rebuild. |
 | Harness self-test | pass | Required because `scripts/execute.py` differs from the `dev` merge base; `7/7` passed. |
 | reference immutability | pass | Required S4 SHA-256 values match; entire `reference/` tree has no Git diff or status entry. |
 ## CTest Inventory
 | inventory | count |
 | --- | ---: |
 | all discovered tests | 144 |
 | unit label | 121 |
 | integration label | 10 |
 | reference label | 13 |
 | test names containing `Mitc4` | 32 |
 | failed tests | 0 |
 The `32` MITC4-named tests comprise `30` tests in `Mitc4*` suites plus
 `DomainModel.Mitc4ShellRecordsPreserveSourceAndInternalIdentity` and
 `InpDomainMapping.MapsS4AndS4rThroughOneMitc4Identity`. The broader focused regex
 also exercises shared Domain, DOF, constraints, assembly, recovery, and HDF5 seams.
 CTest currently applies the target-wide legacy label
 `linear-static-3d-euler-beam` to all `144` tests and has no separate MITC4 label.
 The approved implementation plan explicitly permits exact suite regex filtering,
 which was used here, so this labeling limitation is nonblocking.
 ## Warning and Failure Audit
 - Clean rebuild warning lines: `0`.
 - Clean rebuild compiler/linker error lines: `0`.
 - Focused CTest failures: `0`.
 - Full CTest failures: `0`.
 - Harness Python failures: `0`.
 - Configure probes for POSIX pthread symbols reported expected negative probe
  results on MSVC before CMake resolved `Threads: TRUE`; this is not a configure
  warning or failure.
 - One report-generation helper failed because it assumed a CMake internal versioned
  directory. The corrected dynamic lookup passed. This incident did not affect
  configure, compile, link, test, reference artifacts, or the gate verdict.
 ## Reference Read-Only Audit
 | exact approved path | observed SHA-256 | expected match |
 | --- | --- | --- |
 | `reference/shell/shell.inp` | `4005851E1AB22FD3A16AC17A8D5DA3E051233F69F37419079F3553AD134ECFCF` | yes |
 | `reference/shell/shell displacements.csv` | `C81D94E0B4A849F87AA0F79C83A79B94D5661AC79E44ED826919AB432C87746B` | yes |
 The post-test audit found zero changed paths anywhere under `reference/`. No Abaqus
 or other reference solver was run.
 ## Failure Classification
 - classification: `N/A`
 - primary_failure: `N/A`
 - first_failed_build_or_test_command: `N/A`
 - failed_target_or_test: `N/A`
 - correction_handoff: `N/A`
 - non_gating_incident: report-only environment metadata lookup used the wrong CMake
  internal directory and was rerun successfully; no product correction is required
 ## Failed Test Inventory
 None. All focused, full CTest, and Harness Python tests passed.
 ## Handoff Recommendation
 | target_agent | reason | required_input |
 | --- | --- | --- |
 | Reference Verification Agent | Build/test status is `pass-for-reference-verification`. | This report, source HEAD `820ba30...`, `.harness/build/tests/Debug/fesa_reference_tests.exe`, and the unchanged declared S4 input/CSV pair. |
 The focused reference CTest generated/used build-local comparison evidence, but the
 Build/Test Executor does not interpret that evidence as the formal reference
 tolerance verdict. Reference Verification must independently inspect and report it.
 ## No-Change Assertion
 - source_files_modified: `false`
 - test_files_modified: `false`
 - cmake_files_modified: `false`
 - requirements_formulation_io_numerical_reference_documents_modified: `false`
 - phase_files_modified: `false`
 - tolerance_policies_modified: `false`
 - reference_artifacts_modified: `false`
 - owned_report_modified: `true`
 - notes: The worktree was clean at the requested source HEAD before this report was
  created. Build products remained under the ignored `.harness/build/` directory.
 ## Open Issues
 - None blocking Reference Verification.
 - The target-wide legacy CTest label prevents a precise MITC4 label count; exact
  implementation-plan suite regexes provide the approved focused test entry point.
@@ -0,0 +1,331 @@
 # Linear Static MITC4 Shell Physics Evaluation Report
 ## Metadata
 - feature_id: `linear-static-mitc4-shell`
 - model_id: `shell-s4`
 - evaluated_head: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
 - source_build_test_report:
  `docs/build-test-reports/linear-static-mitc4-shell-build-test.md`
 - source_reference_verification_report:
  `docs/reference-verifications/linear-static-mitc4-shell-reference-verification.md`
 - source_reference_model:
  `docs/reference-models/linear-static-mitc4-shell-reference-models.md`
 - source_requirement: `docs/requirements/linear-static-mitc4-shell.md`
 - source_formulation: `docs/formulations/mitc4-shell-formulation.md`
 - source_numerical_review:
  `docs/numerical-reviews/linear-static-mitc4-shell-review.md`
 - source_io_definition: `docs/io-definitions/linear-static-mitc4-shell-io.md`
 - status: `pass-for-release-agent`
 - owner_agent: `physics-evaluation-agent`
 - date: `2026-08-13`
 This verdict means that the documented physical checks pass and the Release Agent
 may audit release readiness. It does not approve release readiness, re-approve the
 reference comparison, or change its tolerance decision.
 ## Input Evidence
 The prerequisite reference-verification report has status
 `pass-for-physics-evaluation`. The existing S4 reference-test route was rebuilt and
 executed to regenerate fresh FESA evidence. Abaqus and other reference solvers were
 not executed.
 | evidence | exact path or identity | status | notes |
 | --- | --- | --- | --- |
 | build/test report | `docs/build-test-reports/linear-static-mitc4-shell-build-test.md` | `pass-for-reference-verification` | Clean MSVC x64 Debug build, focused `87/87`, lifecycle `10/10`, reference `8/8`, and full `144/144` CTest passed. |
 | reference verification | `docs/reference-verifications/linear-static-mitc4-shell-reference-verification.md` | `pass-for-physics-evaluation` | Required prerequisite satisfied; 147/147 blocking U rows passed and no UR warning was emitted. |
 | solver HDF5 | `.harness/build/reference/mitc4-shell-s4-comparison/results.h5` | present and readable | Freshly generated, 95,024 bytes; observed raw SHA-256 `E102D80E82BA133EBDF1C5532F3A0A4FE9984AB6CC36D00264399F7308D9230F` (inventory only). |
 | comparison ledger | `.harness/build/reference/mitc4-shell-s4-comparison/comparison.json` | present and passing | 94,349 bytes; SHA-256 `8E8DEA51B6F7C663BACC41FDA6103A4596DB26E02F1EAD6069D458F51E0102E6`; `passed=true`. |
 | declared S4 input | `reference/shell/shell.inp` | present, unchanged, read-only | SHA-256 `4005851E1AB22FD3A16AC17A8D5DA3E051233F69F37419079F3553AD134ECFCF`. |
 | declared displacement CSV | `reference/shell/shell displacements.csv` | present, unchanged, read-only | SHA-256 `C81D94E0B4A849F87AA0F79C83A79B94D5661AC79E44ED826919AB432C87746B`. |
 | optional Abaqus reaction/stress CSVs | `reference/shell/shell reactions.csv`, `reference/shell/shell stresses.csv` | not used as equality gates | Their presence did not expand the approved U-only blocking boundary. |
 | solver CSV views | N/A | not generated | HDF5 was inspected directly. |
 | fresh S4 route | `.harness/build`, MSVC x64 Debug | pass | `Mitc4S4Reference.*` passed `2/2`. |
 The HDF5 contains 49 nodes, 36 source-`S4` elements, internal formulation
 `FESA-MITC4`, and the required full `2 x 2 x 2` result inventory. All inspected
 numeric model and result values were finite. The diagnostics dataset contains four
 approved warning rows for ignored `PREPRINT`, `RESTART`, and `OUTPUT` keywords and
 no error diagnostic.
 Raw HDF5 bytes are not a physics decision identity and may change across valid
 regenerations. The projected values and deterministic comparison ledger are the
 relevant evidence.
 ### Documented model expectation
 The reference input is a flat `10 x 10`, thickness `0.5`, homogeneous isotropic
 square plate with `E=2.1e11` and `nu=0.3`. Its 24 perimeter nodes are fully clamped
 in all six global DOFs, and center node 2 at the global origin carries one
 `F3=-100000` concentrated force. The geometry, boundary, material, and load are
 symmetric about both global `x=0` and `y=0` planes.
 The documented physical expectations are therefore:
 - total constrained reaction force opposes the applied `-Z` force;
 - total force and moment about the global origin balance within the approved
  normalized `1e-10` limit;
 - perimeter displacements are zero and the interior deflects in `-Z`, with the
  largest magnitude at the center;
 - the displacement and rotation field obeys the polar/axial-vector reflection
  parity about both symmetry planes;
 - a linear, flat transverse plate response has no membrane strain/resultant or
  middle-surface in-plane stress, while bottom and top in-plane stresses reverse;
 - stored physical strain energy is finite, strictly positive, and consistent with
  the recovered generalized fields and `0.5 F^T d`;
 - free residual, finite results, rank/rigid-mode evidence, and the approved
  one-case coverage show no rigid-body or unsupported-mode symptom.
 ## Physics Checks
 | check | documented expectation | observed evidence | verdict | classification |
 | --- | --- | --- | --- | --- |
 | global equilibrium | Applied plus constrained reaction force/moment about origin; normalized metrics `<=1e-10` | force residual `[0,0,-1.12049747258425e-9]`; moment residual `[6.45741238258779e-10,-2.63753463514149e-10,0]`; normalized force/moment `1.12049747258425e-14` / `2.35981341581908e-15` | pass | N/A |
 | reaction consistency | Perimeter-only reactions from full residual oppose `F3=-100000`; constrained motion is zero | summed constrained force `[0,0,99999.9999999989]`; constrained displacement exactly zero | pass | N/A |
 | displacement direction | Interior bends in `-Z`; center is maximum; no in-plane or drilling leakage | center `U3=-2.35504417650849e-5`; all 25 free-node U3 values nonpositive; `U1/U2/UR3` exactly zero | pass | N/A |
 | symmetry | Correct polar/axial reflection parity about `x=0` and `y=0` | max absolute reflection mismatch `4.27126230127111e-20` / `2.29087480670778e-20` | pass | N/A |
 | element force balance | No documented direct element-end-action output exists for shell GP resultants | Global assembled residual/equilibrium passed; direct element-end-action balance is skipped rather than inferred from mismatched locations | skipped | N/A |
 | recovered resultant consistency | `N=A*epsilon0`, `M=D*kappa`, `Q=As*gamma0` at each of 144 GP rows | absolute L2 residual `9.9301874551584e-12`; normalized L2 `5.56240926027087e-17` | pass | N/A |
 | stress/location/sign sanity | Local `[S11,S22,S12]` at bottom/middle/top; middle zero and faces reverse for this linear flat bending field | absolute L2 constitutive residual `1.29488994752188e-9`; normalized `3.05323934859307e-16`; middle stress exactly zero; face reversal exact | pass | N/A |
 | rigid body/nonfinite | Complete constraints, finite solution, acceptable residual, no abnormal uncontrolled mode | zero nonfinite values; `FREE_RESIDUAL_NORMALIZED=1.07747756058988e-14`; rank/rigid-mode tests passed upstream | pass | N/A |
 | physical energy | Positive and consistent physical-only energy; no drilling-energy gate | `1.17752208825422`; independently recovered value identical to relative `1.88569375589575e-16`; `0.5F^Td=1.17752208825424` | pass | N/A |
 | model coverage | Approved sole S4 case plus declared invariant/patch/common-path portfolio | S4 case covers end-to-end symmetric plate response; focused build/test portfolio passed; expanded models are explicitly nonblocking | pass | N/A |
 ### 1. Global force and moment equilibrium
 The reaction dataset is the assembled full residual `K*d-F`. Applying the
 constraint mask gives
 ```text
 sum constrained RF = [0, 0, 99999.9999999989]
 sum applied F       = [0, 0, -100000]
 force residual      = [0, 0, -1.12049747258425e-9]
 ```
 The load acts at the global origin and therefore contributes no origin moment.
 The constrained force and moment rows give
 ```text
 moment residual = [ 6.45741238258779e-10,
                   -2.63753463514149e-10,
                    0 ]
 ```
 These independently reconstructed values match the stored HDF5 equilibrium vector
 exactly. The serialized normalized metrics are:
 | metric | value | threshold | result |
 | --- | ---: | ---: | --- |
 | `FREE_RESIDUAL_NORMALIZED` | `1.07747756058988e-14` | `1.0e-10` | pass |
 | `FORCE_BALANCE_NORMALIZED` | `1.12049747258425e-14` | `1.0e-10` | pass |
 | `MOMENT_BALANCE_NORMALIZED` | `2.35981341581908e-15` | `1.0e-10` | pass |
 ### 2. Reaction consistency and constrained/free meaning
 The 24 perimeter nodes provide 144 constrained DOFs; the remaining 150 DOFs are
 free. The HDF5 constraint mask agrees with the input set exactly, all prescribed
 values are zero, and the maximum constrained displacement is exactly zero.
 The total positive `RF3=99999.9999999989` opposes the center `F3=-100000`. The
 nearly zero total `RF1/RF2` and origin `RM1/RM2/RM3` are required by the centered
 load and double symmetry. The largest raw free residual component is
 `7.62156560085714e-10`; because translational and rotational entries have different
 dimensions, the decision uses the documented normalized metric rather than this
 raw maximum. The normalized free residual passes by more than three orders of
 magnitude.
 ### 3. Displacement direction and deformation mode
 Center node 2 has
 ```text
 [U1,U2,U3,UR1,UR2,UR3]
 = [0, 0, -2.35504417650849e-5, 0, 0, 0]
 ```
 Every free-node `U3` is nonpositive, the center is the maximum-magnitude
 translation, and every clamped boundary displacement is zero. Across the complete
 model, maximum absolute `U1`, `U2`, and `UR3` are exactly zero. Maximum absolute
 `UR1` and `UR2` are `7.55060026636931e-6` and
 `7.55060026636933e-6`, respectively. This is the expected symmetric plate-bending
 mode under a negative transverse center load, with no in-plane or drilling
 deformation leakage.
 ### 4. Reflection symmetry and expected zeros
 For reflection through `x=0`, polar displacement components transform as
 `[-U1,+U2,+U3]`, while the axial rotation vector transforms as
 `[+UR1,-UR2,-UR3]`. Reflection through `y=0` similarly uses
 `[+U1,-U2,+U3,-UR1,+UR2,-UR3]`.
 All 294 scalar nodal component comparisons per reflection were paired by source
 coordinates. The maximum absolute mismatch was `4.27126230127111e-20` for the
 `x` reflection and `2.29087480670778e-20` for the `y` reflection. The equality
 evidence is numerical roundoff, not a new acceptance tolerance.
 ### 5. Shell generalized resultants and physical work signs
 At every one of 36 elements times four midsurface Gauss locations, an independent
 constitutive reconstruction applied the documented centered-section identities:
 ```text
 N = A * epsilon0
 M = D * kappa
 Q = As * gamma0
 ```
 The complete 1,152-component resultant comparison has absolute L2 residual
 `9.9301874551584e-12` and normalized L2 residual
 `5.56240926027087e-17`. All membrane strains and `N` resultants are exactly zero,
 as required for this linear flat plate bending response.
 The generalized work density `generalized_strain dot section_resultant` is strictly
 positive at all 144 locations: minimum `4.46321446508071e-4`, maximum
 `1.27059464107458e-1`, negative count `0`. This supports the physical sign and
 component-order interpretation.
 The shell contract does not expose element-end nodal actions and explicitly forbids
 averaging mismatched result locations. Consequently a separate GP-to-element-end
 force-balance assertion is not documented and is marked `skipped`; the assembled
 global residual and equilibrium checks provide the required force-balance evidence.
 ### 6. Stress component, location, and sign sanity
 HDF5 stores local in-plane `[S11,S22,S12]` directly at each GP and ordered section
 positions `BOTTOM(-1), MIDDLE(0), TOP(+1)`. Independent reconstruction used
 `Cps*(epsilon0+z*kappa)` at all 432 section locations. The absolute L2 residual is
 `1.29488994752188e-9`, or normalized `3.05323934859307e-16`, against a maximum
 absolute stored stress of `313250.779137971`.
 All middle-surface in-plane stresses are exactly zero. For every component and GP,
 bottom and top stresses are equal in magnitude and opposite in sign. This is the
 documented curvature/stress-location convention for a centered homogeneous section.
 No `S33`, `S13`, `S23`, nodal stress, or Abaqus stress equality was inferred.
 ### 7. Physical energy, residual, and rigid-body symptoms
 The stored `PHYSICAL_STRAIN_ENERGY` is finite and positive:
 ```text
 HDF5 physical energy              = 1.17752208825422
 independent GP generalized energy = 1.17752208825422
 0.5 * F^T * d                     = 1.17752208825424
 ```
 The HDF5-versus-recovered normalized difference is
 `1.88569375589575e-16`; the final fresh HDF5-versus-external-work normalized
 difference is `9.14561471609432e-15`. The HDF5 value excludes numerical drilling stabilization,
 as required. No drilling-energy ratio, calibration, or warning criterion was
 introduced.
 The solution is finite, the full perimeter support is enforced, the expected
 deformation mode is smooth and symmetric, all three normalized verification
 metrics pass `1e-10`, and the build/test evidence passes six-rigid-mode,
 stabilized-rank, non-rigid positive-energy, and pure-drill separation tests. No
 rigid-body, singular, nonfinite, or abnormal-mode symptom is present.
 ### 8. Approved model coverage
 The sole approved reference model provides end-to-end evidence for the
 full-integration `S4 -> FESA-MITC4` path, a nonzero transverse bending response,
 fully constrained reaction recovery, global force/moment balance, two-axis
 symmetry, physical energy, and shell result recovery.
 The prerequisite focused `87/87` build/test portfolio supplies the documented
 complementary element evidence: membrane, bending, transverse-shear and twist patch
 fields; six physical rigid modes; expected physical/stabilized rank; frame and
 energy invariance; fixed numerical drilling and physical-recovery separation; and
 S4/S4R common-kernel/source-metadata behavior. The reference verification supplies
 the approved external displacement comparison.
 This is the complete approved coverage for the feature. Pinched-cylinder,
 hemisphere, Scordelis-Lo, locking/convergence sequences, drilling calibration,
 expanded distorted/curved portfolios, and `NR-O01` through `NR-O04` are explicitly
 nonblocking or out of scope and were not invented as new physics gates.
 ## Execution Evidence
 | order | exact command or read-only operation | exit code | result |
 | ---: | --- | ---: | --- |
 | 1 | `cmake --build .harness/build --config Debug --target fesa_reference_tests` | `0` | Existing S4 reference route rebuilt. |
 | 2 | `ctest --test-dir .harness/build -C Debug -R '^Mitc4S4Reference\.' --output-on-failure` | `0` | Fresh S4 tests `2/2` passed; FESA HDF5 and ledger regenerated. |
 | 3 | `h5dump.exe -n .harness/build/reference/mitc4-shell-s4-comparison/results.h5` with HDF5/oneAPI runtime on `PATH` | `0` | Required HDF5 inventory inspected read-only. |
 | 4 | `h5dump.exe -y -w 0 -m '%.17g' -d <dataset> .harness/build/reference/mitc4-shell-s4-comparison/results.h5` for model nodes/elements/mask/prescribed values, nodal U/R, shell frames/strain/resultant/stress, energy/equilibrium/metrics/diagnostics | `0` | High-precision read-only numerical audit supplied all reported values. |
 | 5 | PowerShell independent input/mask, reaction/equilibrium, reflection, constitutive recovery, stress-location, energy, finite, and diagnostics audit over the `h5dump` values | `0` | All documented physics assertions passed. |
 | 6 | `cmake --build .harness/build --config Debug --target fesa_unit_tests fesa_reference_tests`, then `ctest --test-dir .harness/build -C Debug -R 'Mitc4Shell(Kernel|Patch|Drilling|PhysicalRecovery)|ResultRecovery\..*Shell|Mitc4S4Reference' --output-on-failure` | `0` | Final focused verification passed `17/17`; the regenerated ledger retained `passed=true`, 294 rows, and zero warnings. |
 Three intermediate audit-helper incidents were diagnostic-only and did not alter
 the product or verdict: a compound-record regular expression initially omitted the
 last node, a PowerShell array-expression initially bound subtraction to an array,
 and a final optional `h5ls` operand-order probe exited `1`. The root causes were
 confirmed as audit-command/parser usage, while successful high-precision HDF5
 inspection established 49/49 nodes and the complete evidence above. They are not
 solver, HDF5-schema, reference, or physics failures.
 ## Failure Classification
 - classification: `N/A`
 - primary_failure: `N/A`
 - evidence: all documented force/moment equilibrium, reaction, displacement,
  symmetry, recovery, stress-location, physical-energy, residual, finite-result,
  rigid-mode and approved coverage checks passed
 - correction_handoff: `N/A`
 - non_gating_incident: resolved read-only audit helper parsing/usage errors only
 ## Evaluation Verdict
 - verdict: `pass-for-release-agent`
 - reason: the prerequisite reference status is valid and fresh FESA S4 evidence
  satisfies every documented physical expectation under its approved threshold;
  no implementation, formulation, I/O, model-coverage, nonfinite, rigid-body, or
  environment failure remains
 - release_approval: `not granted by this report`
 - reference_reapproval: `not performed by this report`
 ## Handoff Recommendation
 | target_agent | reason | required_input |
 | --- | --- | --- |
 | Release Agent | All documented MITC4 physics checks passed. | This report, the build/test and reference-verification reports, the fresh build-local HDF5/comparison evidence, and the nonblocking limitations below. |
 ## No-Change Assertion
 - source_files_modified: `false`
 - test_files_modified: `false`
 - cmake_files_modified: `false`
 - requirements_modified: `false`
 - formulation_modified: `false`
 - numerical_review_modified: `false`
 - io_contract_modified: `false`
 - reference_model_contract_modified: `false`
 - build_test_report_modified: `false`
 - reference_verification_report_modified: `false`
 - phase_files_modified: `false`
 - tolerance_policies_modified: `false`
 - reference_artifacts_modified: `false`
 - Abaqus_or_other_reference_solver_executed: `false`
 - owned_report_created: `true`
 - generated_build_local_evidence: `true`, ignored under `.harness/build/`
 - pre_existing_untracked_build_test_report_preserved: `true`
 - pre_existing_untracked_reference_verification_report_preserved: `true`
 ## Open Issues
 - Nonblocking coverage limitation: the approved external reference inventory is one
  flat, symmetric, fully clamped S4 plate. The approved analytical/unit portfolio
  supplies membrane, shear, twist, rigid-mode, rank, drilling-separation and S4R
  common-path evidence. No broader Abaqus or benchmark portfolio is claimed.
 - Known original-MITC4 limitations remain: transverse-shear locking is mitigated by
  the tying field, but distorted-curved membrane locking and broader thin/thick mesh
  convergence are not characterized by this release gate.
 - Source `S4R` maps to the same full-integration FESA kernel and is not compared to
  the optional Abaqus S4R artifacts. This is an approved boundary, not missing
  physics evidence.
 - The fixed numerical drilling stiffness is not a physical stress/resultant/energy
  channel. No drilling calibration, coefficient sweep, energy-ratio gate, or
  director-parallel moment support is claimed.
 - Geometrically nonlinear execution remains outside the current feature even though
  future-only residual/tangent equations are documented. No nonlinear release claim
  is made.
 - No open issue blocks Release Agent review.
@@ -0,0 +1,242 @@
 # Linear Static MITC4 Shell Reference Verification Report
 ## Metadata
 - feature_id: `linear-static-mitc4-shell`
 - model_id: `shell-s4`
 - source_head: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
 - source_build_test_report:
  `docs/build-test-reports/linear-static-mitc4-shell-build-test.md`
 - source_reference_models:
  `docs/reference-models/linear-static-mitc4-shell-reference-models.md`
 - source_io_definition: `docs/io-definitions/linear-static-mitc4-shell-io.md`
 - source_requirements: `docs/requirements/linear-static-mitc4-shell.md`
 - status: `pass-for-physics-evaluation`
 - owner_agent: `reference-verification-agent`
 - date: `2026-08-13`
 The prerequisite build/test report has status `pass-for-reference-verification`.
 This report verifies only the approved full-integration S4 displacement case. It
 does not compare S4R artifacts, claim Abaqus formulation equivalence, approve
 physics sanity, or approve release readiness.
 ## Verdict
 The reference-comparison gate passes. The fresh FESA result has an exact
 294-row identity match to the read-only Abaqus displacement CSV. All 147 blocking
 `U1/U2/U3` rows satisfy the fixed absolute tolerance `1.0e-5`. All 147
 warning-only `UR1/UR2/UR3` rows also satisfy `1.0e-5`, so no rotational warning
 was emitted.
 - declared cases compared: `1/1`
 - blocking rows passed: `147/147`
 - blocking failures: `0`
 - warning-only rows compared: `147/147`
 - warning-only exceedances and warnings: `0/0`
 - missing / extra / duplicate / nonfinite rows: `0 / 0 / 0 / 0`
 - largest blocking normalized error: `0.0190378534915144`
 - comparison verdict: `passed=true`
 ## Artifact Inventory
 | item | exact path | status | direct evidence |
 | --- | --- | --- | --- |
 | declared S4 input | `reference/shell/shell.inp` | present, unchanged | 4,770 bytes; SHA-256 `4005851E1AB22FD3A16AC17A8D5DA3E051233F69F37419079F3553AD134ECFCF` |
 | required displacement CSV | `reference/shell/shell displacements.csv` | present, unchanged | 5,592 bytes; SHA-256 `C81D94E0B4A849F87AA0F79C83A79B94D5661AC79E44ED826919AB432C87746B`; 49 wide rows and six finite components per row |
 | authoritative solver output | `.harness/build/reference/mitc4-shell-s4-comparison/results.h5` | present, valid | 95,024 bytes after a fresh verification run; observed raw SHA-256 `E88E5E5E1F83AB95CAE545AD1F28F896D3FCB82F3EA2B8006A3A703FED07A5CB` (non-decision inventory only) |
 | deterministic comparison ledger | `.harness/build/reference/mitc4-shell-s4-comparison/comparison.json` | present, valid | 94,349 bytes; SHA-256 `8E8DEA51B6F7C663BACC41FDA6103A4596DB26E02F1EAD6069D458F51E0102E6`; `passed=true` |
 | S4R reference artifacts | `reference/shellR/` | not consumed | Excluded from the approved acceptance comparison. |
 | reaction and stress CSVs | other files under `reference/shell/` | not consumed | Optional inspection evidence only; not an equality gate. |
 | FESA-derived CSV | N/A | not generated | HDF5 was compared directly to the Abaqus CSV. |
 The input and required CSV had identical SHA-256 values and identical UTC
 modification times (`2026-08-11T11:44:40.9520527Z`) before and after the fresh
 comparison runs. `git diff --name-only -- reference` and
 `git status --short -- reference` each returned zero paths.
 The HDF5 hash above inventories one fresh generation, not a stable content
 identity. Raw HDF5 bytes changed across regenerations while the projected values
 and deterministic JSON ledger remained identical; concurrent executions of the
 same ignored build-local route may replace the file again. This report does not
 claim byte-identical HDF5 container output.
 ### Authoritative HDF5 projection audit
 The comparator and a read-only HDF5 2.1.1 inspection established:
 - `/metadata`: schema version `0`, feature `linear-static-mitc4-shell`, solver
  version `0.1.0`, `Step-1`, frame `0`, internal formulation `FESA-MITC4`, and
  integration rule `2x2x2-gauss; mitc4-edge-midpoint-shear`;
 - source input identity:
  `path=C:/Users/baram/orca/workspaces/FESADev/MITC4/reference/shell/shell.inp;content_identity=fnv1a64:cf0795df753d377e`;
 - `/model/nodes`: 49 compound rows with ordered fields
  `internal_node_id`, `instance_name`, `source_label`, and `coordinates`;
 - `/model/elements`: 36 compound rows, source element type `S4`, and internal
  formulation `FESA-MITC4`;
 - `/steps/Step-1/frames/0/nodal/displacement`: float64 shape `[49,6]`, global
  nodal components `[UX,UY,UZ,URX,URY,URZ]`, mapped to
  `[U1,U2,U3,UR1,UR2,UR3]`;
 - all projected source identities and displacement values are unique and finite.
 ## Comparison Contract
 - case identity: `shell-s4`
 - authoritative FESA dataset:
  `/steps/Step-1/frames/0/nodal/displacement`
 - HDF5 node identity source: `/model/nodes.instance_name` and
  `/model/nodes.source_label`
 - normalized key:
  `(case_id, instance_name, source_node_label, component)`
 - observed instance: `Part-1-1`
 - observed source nodes: 49 unique labels
 - CSV projection: trimmed `Part Instance Name`, `Node Label`, `U-U1`, `U-U2`,
  `U-U3`, `UR-UR1`, `UR-UR2`, and `UR-UR3`
 - stable component order: `[U1,U2,U3,UR1,UR2,UR3]`
 - blocking inventory: `U1/U2/U3`
 - warning-only inventory: `UR1/UR2/UR3`
 - row precheck: exact key set, unique rows, finite HDF5/reference values, and
  exact required HDF5 schema before tolerance evaluation
 - tolerance source: requirements `FESA-REQ-LSMITC4-058` through `064`, the I/O
  definition Section 7, and the approved reference-model contract Section 5
 - row tolerance: `abs(fesa-reference) <= 1.0e-5`
 - tolerance-normalized error: `absolute_error / 1.0e-5`
 - `reference_scale`: diagnostic only; it does not alter the tolerance or verdict
 - zero policy: no clamp, substitution, omission, averaging, or row-order matching
 Independent ledger reconstruction found 294 projected CSV keys, 294 comparison
 keys, zero duplicate keys, and exact set equality. All 294 serialized row
 tolerances equal `1.0e-5`. The complete per-row decisions remain in the
 identified deterministic `comparison.json`.
 ## Execution Evidence
 The existing FESA S4 reference route was used; Abaqus and other reference solvers
 were not executed. The first run regenerated the evidence after its test-owned
 output directory cleanup. Further exact reruns confirmed the ledger bytes and the
 final verification assertions.
 | order | exact command | exit code | result |
 | ---: | --- | ---: | --- |
 | 1 | `cmake --build .harness/build --config Debug --target fesa_reference_tests` | `0` | Reference test executable built; duration `1.830 s`. |
 | 2 | `ctest --test-dir .harness/build -C Debug -R '^Mitc4S4Reference\.' --output-on-failure` | `0` | Fresh S4 E2E tests `2/2` passed; duration `0.760 s`. |
 | 3 | PowerShell CSV/JSON identity and metric audit | `0` | 294 exact keys; missing/extra/duplicate/nonfinite/nonfixed-tolerance counts all zero. |
 | 4 | `ctest --test-dir .harness/build -C Debug -R '^Mitc4S4Reference\.' --output-on-failure` | `0` | Repeat S4 E2E tests `2/2` passed; duration `0.911 s`; JSON hash unchanged. |
 | 5 | `h5dump.exe -A -g '/metadata' <results.h5>` with HDF5 and Intel oneAPI 2026.1 runtime directories prepended to `PATH` | `0` | Required metadata values inspected read-only. |
 | 6 | `h5dump.exe -H -d '/model/nodes' <results.h5>` | `0` | Compound schema and shape `[49]` inspected. |
 | 7 | `h5dump.exe -H -d '/model/elements' <results.h5>` | `0` | Compound schema and shape `[36]` inspected. |
 | 8 | `h5dump.exe -H -d '/steps/Step-1/frames/0/nodal/displacement' <results.h5>` | `0` | Float64 displacement schema and shape `[49,6]` inspected. |
 | 9 | Final `ctest --test-dir .harness/build -C Debug -R '^Mitc4S4Reference\.' --output-on-failure` plus report/metric assertion script | `0` | S4 E2E tests `2/2`; `verification=PASS`; final generated artifacts retained. |
 | 10 | `git diff --check` | `0` | Report patch has no whitespace errors. |
 | 11 | target-only Git scope and reference no-change audit | `0` | Only this owned report and the pre-existing untracked build/test report are visible; reference scope remains clean. |
 An initial optional `h5dump` probe without the Intel runtime directory exited
 `-1073741515` because `libmmd.dll` was not on that process's `PATH`. The same
 read-only inspection passed after adding the installed oneAPI runtime path. This
 was an inspection-environment incident, not a solver, schema, comparison, or
 reference-artifact failure.
 The repeated JSON ledger was byte-identical:
 - size: `94,349` bytes
 - SHA-256 before and after repeat: `8E8DEA51B6F7C663BACC41FDA6103A4596DB26E02F1EAD6069D458F51E0102E6`
 - row decisions: `294`
 - component metrics: `6`
 - node vector metrics: `49`
 - warnings: `0`
 - verdict: `passed=true`
 ## Quantity Results
 `max_rel` is calculated only for nonzero Abaqus values and is diagnostic. Tiny
 reference residues make it ill-conditioned; the acceptance decision uses only
 the fixed absolute tolerance and its fixed-tolerance-normalized error.
 | quantity | components | behavior | compared | missing | extra | duplicate | nonfinite | max abs | max rel | max normalized | RMS | L2 norm | worst ID/component by abs error | result |
 | --- | --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | --- | --- |
 | displacement | `U1/U2/U3` | blocking | 147 | 0 | 0 | 0 | 0 | `1.90378534915144e-7` | `1.0` | `0.0190378534915144` | `2.45308118840709e-8` | `2.97420287738877e-7` | `Part-1-1`, node 2, `U3` | pass |
 | rotation | `UR1/UR2/UR3` | warning-only | 147 | 0 | 0 | 0 | 0 | `6.88285496274043e-8` | `35.7165926082675` | `0.00688285496274043` | `2.26478498250615e-8` | `2.74590586054375e-7` | `Part-1-1`, node 44, `UR1` | pass, no warning |
 The translational maximum relative error `1.0` occurs on near-zero reference
 residue, including node 1 `U3=-1.17769804e-32`. The rotational maximum relative
 error `35.7165926082675` occurs at node 2 `UR2`, where the reference is
 `1.3860685e-22` and the absolute error is only `4.95056439416524e-21`.
 Neither value was clamped or omitted, and neither relative diagnostic controls
 the verdict.
 ### Component metrics
 Each component contains 49 matched rows. `reference_scale` is retained only as
 diagnostic information. `L2 norm` is the comparator's component
 `vector_norm_error`, and `worst_row` is the zero-based index in the JSON ledger.
 | component | behavior | reference scale | tolerance | max abs | max rel | max normalized | RMS | L2 norm | worst row | worst identity | result |
 | --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | --- | --- |
 | `U1` | blocking | `3.11730945e-23` | `1.0e-5` | `3.11730945e-23` | `1.0` | `3.11730945e-18` | `1.13587076092006e-23` | `7.95109532644045e-23` | 66 | node 12 / `U1` | pass |
 | `U2` | blocking | `3.11730945e-23` | `1.0e-5` | `3.11730945e-23` | `1.0` | `3.11730945e-18` | `1.13587076092006e-23` | `7.95109532644045e-23` | 61 | node 11 / `U2` | pass |
 | `U3` | blocking | `2.37408203e-5` | `1.0e-5` | `1.90378534915144e-7` | `1.0` | `0.0190378534915144` | `4.24886125341252e-8` | `2.97420287738877e-7` | 8 | node 2 / `U3` | pass |
 | `UR1` | warning-only | `7.60725743e-6` | `1.0e-5` | `6.88285496274043e-8` | `11.9344619221920` | `0.00688285496274043` | `2.77378379212910e-8` | `1.94164865449037e-7` | 261 | node 44 / `UR1` | pass, no warning |
 | `UR2` | warning-only | `7.60725743e-6` | `1.0e-5` | `6.88285496273990e-8` | `35.7165926082675` | `0.00688285496273990` | `2.77378379212909e-8` | `1.94164865449036e-7` | 202 | node 34 / `UR2` | pass, no warning |
 | `UR3` | warning-only | `5.27113701e-25` | `1.0e-5` | `5.27113701e-25` | `1.0` | `5.27113701e-20` | `2.12986098533393e-25` | `1.49090268973375e-24` | 203 | node 34 / `UR3` | pass, no warning |
 ### Worst rows and node-vector metrics
 - global worst and worst blocking row: `shell-s4`, `Part-1-1`, node 2,
  `U3`; FESA `-2.35504417650849e-5`, Abaqus `-2.37408203e-5`, absolute
  error `1.90378534915144e-7`, tolerance `1.0e-5`, normalized error
  `0.0190378534915144`, within tolerance;
 - worst warning-only row: `shell-s4`, `Part-1-1`, node 44, `UR1`; FESA
  `1.39850632037260e-6`, Abaqus `1.46733487e-6`, absolute error
  `6.88285496274043e-8`, normalized error `0.00688285496274043`, within
  tolerance;
 - maximum per-node displacement-vector error: `1.90378534915144e-7` at
  `Part-1-1`, node 2;
 - maximum per-node rotation-vector error: `7.21144690026432e-8` at
  `Part-1-1`, node 39.
 ## Failure Classification
 - classification: `N/A`
 - primary_failure: `N/A`
 - evidence: declared artifacts exist; the authoritative HDF5 projection passed
  schema and identity checks; 294/294 exact row keys are unique and finite;
  147/147 blocking rows pass; zero rotational exceedances or warnings occurred
 - correction_handoff: `N/A`
 The optional first `h5dump` runtime-path incident is classified as a resolved
 inspection-environment incident and does not affect this gate.
 ## Handoff Recommendation
 | target_agent | reason | required input |
 | --- | --- | --- |
 | Physics Evaluation Agent | All declared blocking reference rows passed the exact approved tolerance, and the warning-only inventory has no exceedance. | This report, `.harness/build/reference/mitc4-shell-s4-comparison/results.h5`, and its deterministic `comparison.json`. |
 The handoff status is `pass-for-physics-evaluation` only. Physics Evaluation
 remains responsible for equilibrium, reaction sign, displacement direction,
 symmetry, physical energy, result signs, and model-coverage adequacy.
 ## No-Change Assertion
 - source_files_modified: `false`
 - test_files_modified: `false`
 - cmake_files_modified: `false`
 - requirements_modified: `false`
 - formulation_modified: `false`
 - numerical_review_modified: `false`
 - io_contract_modified: `false`
 - reference_model_contract_modified: `false`
 - phase_files_modified: `false`
 - tolerance_policies_modified: `false`
 - reference_artifacts_modified: `false`
 - Abaqus_or_other_reference_solver_executed: `false`
 - owned_report_created: `true`
 - generated_build_local_evidence: `true`, ignored under `.harness/build/`
 - pre_existing_untracked_build_test_report_preserved: `true`
 ## Open Issues
 - None blocking Physics Evaluation.
 - Nonblocking audit note: raw HDF5 container hashes differed across fresh
  regenerations, while the authoritative projected rows and serialized comparison
  ledger were stable and the JSON was byte-identical. No HDF5 byte-determinism
  claim is made by this report.
@@ -0,0 +1,294 @@
 # Linear Static MITC4 Shell Release Report
 ## Metadata
 - feature_id: `linear-static-mitc4-shell`
 - source_requirement: `docs/requirements/linear-static-mitc4-shell.md`
 - source_research: `docs/research/linear-static-mitc4-shell-research.md`
 - source_formulation: `docs/formulations/mitc4-shell-formulation.md`
 - source_numerical_review: `docs/numerical-reviews/linear-static-mitc4-shell-review.md`
 - source_io_definition: `docs/io-definitions/linear-static-mitc4-shell-io.md`
 - source_reference_model: `docs/reference-models/linear-static-mitc4-shell-reference-models.md`
 - source_implementation_plan: `docs/implementation-plans/linear-static-mitc4-shell-implementation-plan.md`
 - source_implementation_evidence: `phases/linear-static-mitc4-shell/index.json`
 - source_implementation_report: `N/A`; the project Harness phase index is the implementation completion ledger for this execution
 - source_correction_report: `N/A`; no final Build/Test, Reference Verification, or Physics Evaluation failure was handed to Correction Agent
 - source_build_test_report: `docs/build-test-reports/linear-static-mitc4-shell-build-test.md`
 - source_reference_verification_report: `docs/reference-verifications/linear-static-mitc4-shell-reference-verification.md`
 - source_physics_evaluation_report: `docs/physics-evaluations/linear-static-mitc4-shell-physics-evaluation.md`
 - audited_source_head: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
 - audited_branch: `feat-linear-static-mitc4-shell`
 - status: `ready-for-release`
 - owner_agent: `release-agent`
 - date: `2026-08-13`
 - release_boundary: internal FESA feature release readiness only; no publish, deploy, package, tag, commit, or external release was performed
 ## Release Scope
 | item | included | excluded | notes |
 | --- | --- | --- | --- |
 | analysis type | One small-displacement, small-rotation `*STEP, *STATIC` | Multiple steps, geometric/material nonlinearity, buckling, modal, dynamic, contact, thermal | Existing factorize-before-load linear-static lifecycle is retained. |
 | element type | Four-node source `S4` and `S4R` mapped to one full-integration `FESA-MITC4` path | `S3`, `S8`, `S8R`, continuum/solid/axisymmetric shells, MITC4+, MITC4/D, reduced integration/hourglass behavior | Source type is preserved as metadata; no Abaqus formulation-equivalence claim is made. |
 | nodal degrees of freedom | Global `[UX,UY,UZ,URX,URY,URZ]`; 20 physical element coordinates plus four numerical drilling coordinates | Physical drilling strain/load/result channel | Director-parallel nodal moment is rejected. |
 | material and section | Centered, single-layer, homogeneous isotropic linear elasticity with finite valid `E`, `nu`, and constant positive thickness | Composite/laminated or orthotropic sections, offsets, variable/nodal thickness, user orientation | Multiple valid materials/sections/element sets are allowed with exactly one assignment per element. |
 | geometry | Valid four-node quadrilaterals and smooth shell patches with deterministic geometry-derived directors | Explicit normals/directors, shared-node sharp folds, hinges, shell-beam joints, calibrated distortion/warp thresholds | A physical fold requires duplicated source nodes. |
 | loads and constraints | Nodal `*BOUNDARY` and global nodal `*CLOAD` on DOFs 1-6, subject to the drilling-moment projection rule | `*DLOAD`, pressure, gravity, body/edge/follower load | Output-request keywords in the allowlist remain warning no-ops. |
 | authoritative output | HDF5 `results.h5`: nodal displacement/full residual, shell frames, generalized strain/resultant, bottom/middle/top in-plane stress, physical energy, equilibrium, verification metrics, diagnostics | Official CSV solver output, drilling output/energy, `S33`, pointwise `S13/S23`, nodal shell-stress averaging | HDF5 schema version remains `0` and is extended additively. |
 | external acceptance | Read-only `reference/shell/shell.inp` and `reference/shell/shell displacements.csv`; `U1/U2/U3` blocking at fixed absolute `1.0e-5`; `UR1/UR2/UR3` warning-only at the same value | S4R artifact consumption; Abaqus reaction/stress/strain/resultant equality | Direct HDF5-to-CSV source identity mapping is authoritative. |
 ## Gate Evidence Inventory
 | gate | source | expected status/evidence | observed status/evidence | verdict |
 | --- | --- | --- | --- | --- |
 | requirements | `docs/requirements/linear-static-mitc4-shell.md` | approved scope, acceptance criteria, tolerance and reference boundary | `approved`; requirements `001-072` are all `must` and covered without gaps | pass |
 | research | `docs/research/linear-static-mitc4-shell-research.md` | approved evidence with applicability limits | `approved`; no research-owned blocking decision remains | pass |
 | formulation | `docs/formulations/mitc4-shell-formulation.md` | implementation-ready current linear formulation | `approved-for-implementation-planning`; future nonlinear Section 15 remains explicitly non-executable | pass |
 | numerical review | `docs/numerical-reviews/linear-static-mitc4-shell-review.md` | `pass-for-implementation-planning` | `pass-for-implementation-planning`; no current-scope blocker | pass |
 | I/O definition | `docs/io-definitions/linear-static-mitc4-shell-io.md` | approved input/HDF5/comparison contract | `approved-for-implementation-planning`; exact S4-only acceptance boundary and fixed tolerance are present | pass |
 | reference model | `docs/reference-models/linear-static-mitc4-shell-reference-models.md` | approved exact artifact inventory and row mapping | `approved-for-implementation-planning`; both declared files exist and match hashes | pass |
 | implementation plan | `docs/implementation-plans/linear-static-mitc4-shell-implementation-plan.md` | approved TDD plan tracing every `must` requirement | `ready-for-implementation`; ranges cover `001-072` exactly once | pass |
 | implementation | `phases/linear-static-mitc4-shell/index.json` at source HEAD | completed RED/GREEN/VERIFY execution | Steps `0-13` are `completed`; all 14 `stepN-output.json` records have `exitCode=0`; top-level phase is `completed` | pass |
 | correction | final downstream reports and commit/Harness history | no unresolved implementation-owned failure | `N/A`; final Build/Test and Reference Verification classify correction handoff as `N/A`; historical pre-gate Step 13 retries are closed | pass |
 | build/test | `docs/build-test-reports/linear-static-mitc4-shell-build-test.md` | `pass-for-reference-verification` | `pass-for-reference-verification`; clean MSVC x64 Debug build, focused `87/87`, `10/10`, `8/8`, full `144/144`, Harness Python `7/7`, zero warnings | pass |
 | reference verification | `docs/reference-verifications/linear-static-mitc4-shell-reference-verification.md` | `pass-for-physics-evaluation` | `pass-for-physics-evaluation`; exact `294/294` row identity, blocking U `147/147`, UR warnings `0`, invalid rows `0` | pass |
 | physics evaluation | `docs/physics-evaluations/linear-static-mitc4-shell-physics-evaluation.md` | `pass-for-release-agent` | `pass-for-release-agent`; equilibrium, reaction, direction, symmetry, recovery, stress signs, residual and physical energy pass | pass |
 ### Gate Consistency and Staleness Audit
 - Every gate uses `feature_id=linear-static-mitc4-shell`. Build/Test, Reference Verification, and Physics Evaluation all identify source HEAD `820ba30c717b3d0e113775608e20dfd5fbc05d53`, which is the audited current HEAD.
 - The requirements metadata value `current_product_state=requirements-approved-not-implemented` records the product state when the requirements gate was authored. It is not the requirements gate status and does not alter the later implementation evidence.
 - Numerical Review values `implementation_complete=false`, `build_test_complete=false`, `reference_comparison_complete=false`, `physics_evaluation_complete=false`, and `release_ready=false` are explicit pre-implementation review boundaries. Later same-feature reports at the audited HEAD supply those downstream decisions. They are phase-time markers, not contradictory live statuses.
 - No contract meaning, reference inventory, tolerance, or source identity in those earlier documents conflicts with the final reports. The phase-time markers are therefore nonblocking and are not silently treated as current completion claims.
 - A separate implementation report is nonblocking under the current workflow because the Build/Test report explicitly declares `source_implementation_report=N/A` and points to the Harness index. The index records each RED failure, GREEN behavior, focused/full verification summary and completion timestamp, while all 14 generated step-output records have `exitCode=0`.
 - A correction report is nonblocking `N/A`: Correction Agent reporting is required after a formal downstream failure handoff. The final formal Build/Test, Reference Verification, and Physics Evaluation gates report no such failure or unresolved defect. Historical implementation-phase retries and correction commits precede the clean independent gates and are closed by the final phase ledger and source HEAD.
 - The Numerical Review metadata contains two historical commit references (`reviewed_head=cf769aa` and a downstream note naming `a058ef7`). This is a document-history inconsistency, but its mathematical verdict was re-audited against the current tracked requirements/formulation/I/O/reference contracts and independently exercised at `820ba30...`; it does not create a scope, tolerance, or acceptance contradiction.
 ## Evidence Hash Inventory
 SHA-256 values are lowercase. The build-local HDF5 container is intentionally not a decision identity because valid regenerations can change raw container bytes; the deterministic projected ledger is the stable comparison evidence.
 | evidence | bytes | SHA-256 | audit role |
 | --- | ---: | --- | --- |
 | requirements | 35,124 | `c8966f667ee42c3d35d0bf2f1bc1662a93784a2037d5b191b59793fb5ad66c64` | approved must-requirement baseline |
 | research | 37,197 | `45f02291c8b2fdc7066cdb938cf6662a97dd3dceb9023fa743fe1c356a7970b4` | theory/benchmark/applicability evidence |
 | formulation | 57,593 | `117932a112b2ad7f1cb6a8084304733fcd529a675a93cca6364c2f6a16c57cd0` | mathematical implementation contract |
 | numerical review | 24,406 | `c82bd7b4f14f7664fb082d9a860dc443bf76571affa24caa8a7a9acfba04af1e` | independent formulation gate |
 | I/O definition | 41,327 | `6f362b16625e61c85949648e6bc1f215c92ff31e99654f6efd9787b428dd54c4` | input/HDF5/comparison contract |
 | reference model | 6,112 | `978e18485a627b6abf83373f74929cfe564952d29f68574e0cab75ef5e689c44` | exact S4 inventory and row mapping |
 | implementation plan | 56,316 | `8d269455d0d5fe9bb9dc32f140d1ea6f105bab60ebfe73d368ad8c5225af6482` | TDD task/test traceability |
 | Harness implementation index | 7,392 | `8c0a7369bc81fc7a12f9f3a49158a9534d4727b9a924c95b1ece7e915d16880d` | 14-step completion ledger |
 | Build/Test report | 11,970 | `d261e13eb1c6dc20cf24f85ee97a3fcb6b667420486ad12725030e3eebf8dcd1` | independent MSVC/CMake/CTest evidence |
 | Reference Verification report | 14,362 | `2c69814eeb265bd47672c46e17e2c63d55a0f8d834325c2b0d78e0500a83bade` | fixed-tolerance comparison evidence |
 | Physics Evaluation report | 19,596 | `d753521c73ac8509fe2d3e2896e2f6dd23a362c0f17f153fadbeb6227b8ed4c6` | physical plausibility evidence |
 | declared S4 input | 4,770 | `4005851e1ab22fd3a16ac17a8d5da3e051233f69f37419079f3553ad134ecfcf` | immutable reference input |
 | declared S4 displacement CSV | 5,592 | `c81d94e0b4a849f87aa0f79c83a79b94d5661ac79e44ed826919ab432c87746b` | immutable required reference quantity |
 | deterministic comparison ledger | 94,349 | `8e8dea51b6f7c663bacc41fda6103a4596db26e02f1ead6069d458f51e0102e6` | `294` row decisions, `passed=true`, zero warnings |
 ## Acceptance Traceability
 Evidence abbreviations: `PH` = Harness phase index; `BT` = Build/Test report; `RV` = Reference Verification report; `PE` = Physics Evaluation report. `shell-s4` means the sole declared read-only S4 comparison model. Every row below has priority `must` in the approved requirements baseline.
 | requirement_id | acceptance criterion | test/phase evidence | reference/physics evidence | release disposition |
 | --- | --- | --- | --- | --- |
 | `001` | Exactly one supported static step; unsupported procedure or second step fails deterministically. | `InpDomainMapping.*Procedure*`; `Mitc4ShellCli.*`; PH Steps 1/12; BT | N/A | released |
 | `002` | S4 and S4R map to one FESA MITC4 path without equivalence claim. | `InpDomainMapping.MapsS4AndS4rThroughOneMitc4Identity`; PH Steps 0/1/7; BT | S4R is intentionally non-reference | released |
 | `003` | Source element type and internal formulation remain separate metadata. | `DomainModel.Mitc4ShellRecordsPreserveSourceAndInternalIdentity`; `Hdf5ResultsWriter.WritesExactShellMetadataAndModelIdentity`; BT | RV HDF5 projection audit | released |
 | `004` | Four distinct ordered nodes and stable source element identity are enforced. | `InpDomainMapping.RejectsInvalidShellConnectivityOptionsAndMixedModels`; Domain/HDF5 tests; BT | RV observed 36 uniquely identified S4 elements | released |
 | `005` | Six global DOFs use the exact order and equation ownership remains in DofManager. | `DofManager.BuildsShellScatterInSourceNodeAndComponentOrder`; HDF5 schema tests; PH Steps 0/6/11; BT | RV `[UX,UY,UZ,URX,URY,URZ]` projection | released |
 | `006` | Valid homogeneous isotropic `E,nu` is accepted and invalid/unsupported material data fails. | `InpDomainMapping.RejectsInvalidShellAssignmentsAndProperties`; `Mitc4ShellConstitutive.*`; BT | PE material audit | released |
 | `007` | One finite positive constant thickness is accepted for a centered single-layer shell section. | Domain/model/mapping tests; `Mitc4ShellConstitutive.*`; BT | PE thickness/model audit | released |
 | `008` | Each element resolves to exactly one section and material; missing/conflicting/duplicate assignments fail. | `DomainModel.ShellOwnershipPreservesResolvedAssignmentsAndOptionalFrames`; `InpDomainMapping.RejectsInvalidShellAssignmentsAndProperties`; BT | N/A | released |
 | `009` | Multiple valid sets/sections/materials are allowed while each element remains homogeneous and single-layer. | Domain/model/mapping suites; PH Steps 0/1; BT | N/A | released |
 | `010` | Composite, offset, variable thickness, explicit normal and orientation meanings fail closed. | `InpDomainMapping.RejectsInvalidShellConnectivityOptionsAndMixedModels`; BT | N/A | released |
 | `011` | Nodal director is a unit vector separate from scalar thickness. | `Mitc4Geometry.BuildsDeterministicFramesForPlanarRotatedAndWarpedElements`; HDF5 director tests; BT | PE finite/model audit | released |
 | `012` | Element normal candidate follows deterministic source order and tangent cross product. | `Mitc4Geometry.*`; PH Step 2; BT | N/A | released |
 | `013` | Smooth shared-node directors use deterministic area-weighted averaging. | `Mitc4Geometry.AreaWeightsSharedDirectorsInStableSourceIdentityOrder`; BT | N/A | released |
 | `014` | Nonfinite/zero/opposed normals fail without an invented smooth-angle threshold. | `Mitc4Geometry.RejectsInvalidSurfaceJacobianAndIncidentOrientationCases`; BT | N/A | released |
 | `015` | Discontinuous shared-node director fields are not silently averaged; folds require duplicate nodes. | Geometry negative tests and mapper unsupported-scope tests; BT | Documented limitation | released |
 | `016` | Duplicate, bow-tie, nonfinite, zero-area and nonpositive-J geometry fails at every required point. | `Mitc4Geometry.RejectsInvalidSurfaceJacobianAndIncidentOrientationCases`; `.ExposesTheCompleteRequiredValidationPointInventory`; BT | PE finite-result audit | released |
 | `017` | Nodal label/set boundary targets support global DOFs 1-6 and zero/nonzero prescribed values. | `EssentialConstraints.PreservesShellSizedNoMixedAndAllConstraintRoundTrips`; `Mitc4ShellCli.AppliesKfcForNonzeroPrescribedDisplacement`; BT | PE constraint-mask audit | released |
 | `018` | Global nodal force/moment CLOAD components aggregate deterministically. | `LoadAssembly.AggregatesAllSixGlobalShellLoadComponentsInSourceOrder`; BT | PE load/reaction audit | released |
 | `019` | Aggregate director-parallel moment fails as `unsupported-drilling-load`. | `LoadAssembly.AcceptsExactlyZeroAggregateShellMoment`; `.EnforcesAggregateShellMomentDirectorProjectionThreshold`; PH Step 8; BT | N/A | released |
 | `020` | Distributed/follower/body/edge load inputs remain unsupported. | `InpDomainMapping.PreservesProcedureLoadAndOutputRequestBoundariesForShells`; BT | Documented limitation | released |
 | `021` | Only the approved identity-preserving keyword subset plus S4/S4R and shell section is accepted. | `InpDomainMapping.*`; full CTest regression; BT | `shell-s4` parsed end-to-end | released |
 | `022` | Identity wrappers/multiple instances preserve source identity; transforms/nesting remain unsupported. | `InpDomainMapping.*`; Domain identity tests; BT | RV exact instance/node identity | released |
 | `023` | Allowlisted output requests do not affect mandatory results; other model-affecting meanings fail. | `InpDomainMapping.PreservesProcedureLoadAndOutputRequestBoundariesForShells`; `Hdf5ResultsWriter.WritesShellInventoryDespiteRequestsAndOmitsForbiddenPaths`; BT | PE observed warning-only diagnostics | released |
 | `024` | Domain owns shell semantics and AnalysisModel remains a non-owning active view. | `DomainModel.*`; PH Step 0 and full lifecycle Step 12; BT | N/A | released |
 | `025` | DofManager solely owns six-DOF numbering, maps, scatter and sparse pattern. | `DofManager.*`; `EssentialConstraints.*`; PH Step 6; BT | N/A | released |
 | `026` | AnalysisState owns only required linear-static shell solution/recovery/evidence rows. | `AnalysisState.OwnsExactShellRowsInStableElementAndLocationOrder`; `.CommitsFiniteShellGlobalEvidence`; BT | PE required-result audit | released |
 | `027` | Element buffers and stable COO/fixed reduction are deterministic across thread paths. | `SparseAssembly.ShellSerialTbbReverseAndRepeatedRunsAreByteIdentical`; PH Step 7; BT | N/A | released |
 | `028` | Stiffness/partition/factorization precedes load/effective RHS/substitution/recovery/commit. | `Mitc4ShellCli.UsesExistingLifecycleAndExactlyOneFactorization`; `.AppliesKfcForNonzeroPrescribedDisplacement`; `.DoesNotWriteAnInvalidRecoveryCandidate`; BT | PE final-state evidence | released |
 | `029` | Reaction/free equilibrium derives from full residual `K*d-F`. | `ResultRecovery.KeepsFullResidualAndComputesGlobalShellEquilibrium`; BT | PE reaction and equilibrium reconstruction | released |
 | `030` | S4/S4R use the same numerical path and may differ only in source metadata. | Mapper identity test; `SparseAssembly.S4AndS4rSemanticFixturesAssembleIdenticalStiffness`; HDF5 metadata tests; BT | S4R reference intentionally N/A | released |
 | `031` | Physical kernel uses three translations plus two tangent rotations; drilling is not physical strain. | `Mitc4ShellKinematics.BuildsRightHandedFramesAndSeparatePhysicalDrillingMaps`; drill/recovery tests; BT | PE no drilling leakage | released |
 | `032` | Deterministic right-handed frames transform global rotations to tangent/drilling coordinates. | `Mitc4ShellKinematics.BuildsRightHandedFramesAndSeparatePhysicalDrillingMaps`; `Mitc4Geometry.*`; BT | PE symmetry/direction evidence | released |
 | `033` | Drilling is a symmetric positive numerical stabilization only. | `Mitc4ShellDrilling.*`; `Mitc4ShellKernel.*`; BT | PE physical-energy audit | released |
 | `034` | `R+`, `k_ref`, `k_d=1e-3*k_ref`, and `I4` use only eight positive physical rotational diagonals. | `Mitc4ShellDrilling.UsesOnlyEightPositivePhysicalRotationDiagonalsAndFixedFactor`; BT | N/A | released |
 | `035` | Drilling contributes to no physical generalized strain/resultant/stress/output. | `Mitc4ShellDrilling.ExcludesPureDrillFromPhysicalRecoveryAndEnergy`; HDF5 forbidden-path test; BT | PE physical-only recovery/energy | released |
 | `036` | Empty/nonfinite valid `R+` fails; no coefficient/energy calibration gate or output exists. | `Mitc4ShellDrilling.FailsNonfiniteReferenceAndStabilizesEachPureDrillCoordinate`; BT | Documented limitation/boundary | released |
 | `037` | S4 and S4R share the approved full `2x2x2` rule; no reduced integration/hourglass selection. | `Mitc4ShellKinematics.UsesOneFixedTwoByTwoByTwoQuadratureOrder`; S4/S4R assembly parity; BT | RV S4-only boundary | released |
 | `038` | Stabilized element keeps six physical rigid modes, symmetry, energy invariance and positive non-rigid modes. | `Mitc4ShellKernel.*`; `Mitc4ShellPatch.*`; BT | PE rigid/rank/energy evidence | released |
 | `039` | HDF5 is authoritative and invalid candidates cannot replace a valid final result. | `Hdf5ResultsWriter.InvalidShellInventoryPreservesExistingFinal`; CLI invalid-candidate test; BT | RV/PE read authoritative HDF5 | released |
 | `040` | Required metadata/model identities, frames, directors, section/material and source/internal types are written. | `Hdf5ResultsWriter.WritesExactShellMetadataAndModelIdentity`; BT | RV HDF5 schema audit | released |
 | `041` | Every node has global six-component displacement and full-residual reaction rows in stable order. | HDF5 mandatory inventory; `ResultRecovery.*`; BT | RV 49x6 displacement; PE reaction audit | released |
 | `042` | Four shell locations contain ordered eight-component generalized strain with correct dimensions. | `Mitc4ShellPhysicalRecovery.*`; `ResultRecovery.RecoversShellRowsInStableElementAndGpOrder`; HDF5 tests; BT | PE 144-GP reconstruction | released |
 | `043` | The same locations contain ordered `N/M/Q` section resultants with correct dimensions. | Physical recovery/result recovery/HDF5 suites; BT | PE 1,152-component resultant reconstruction | released |
 | `044` | Bottom/middle/top local `[S11,S22,S12]` is emitted; S33/S13/S23 is not. | `ResultRecovery.RecoversDirectBottomMiddleTopShellStress`; HDF5 inventory/forbidden paths; BT | PE stress/location/sign reconstruction | released |
 | `045` | Rows preserve source element, exact natural/section location, frame and component order without averaging. | AnalysisState, ResultRecovery stable-order and HDF5 schema tests; BT | PE location-specific audit | released |
 | `046` | Free residual, force/moment balance and deterministic physical shell energy are output without drilling datasets. | `ResultRecovery.*ShellEquilibrium`; `.SumsOnlyPhysicalShellEnergyInSourceOrder`; HDF5 global rows; BT | PE equilibrium and energy checks | released |
 | `047` | Abaqus output requests neither suppress nor expand mandatory HDF5; CSV remains auxiliary. | Mapper output-request test; `Hdf5ResultsWriter.WritesShellInventoryDespiteRequestsAndOmitsForbiddenPaths`; BT | RV compared HDF5 directly; no FESA CSV | released |
 | `048` | Nonfinite/incomplete recovery or HDF5 inventory fails without partial success. | `AnalysisState.InvalidShellCandidatesLeavePriorStateUnchanged`; `ResultRecovery.InvalidLaterShellLeavesEntirePriorStateUnchanged`; HDF5 invalid-inventory test; BT | N/A | released |
 | `049` | Each production behavior has RED/GREEN/VERIFY evidence, related C++ tests, clean MSVC Debug build and no new warning. | PH Steps 0-13 and outputs; BT clean build, zero warnings, `144/144` | N/A | released |
 | `050` | Frames, Jacobians, symmetry, transform energy, six modes, positivity and repeatability are tested. | Geometry, Kinematics, Kernel, Patch and SparseAssembly suites; BT | PE rigid/rank summary | released |
 | `051` | Approved normalized `1e-12` and `1e-10` algebraic/equilibrium criteria are applied. | Kernel/frame tests; `ResultRecovery.UsesScaleAwareShellMetricsAndRejectsExcess`; BT | PE verification metrics all below `1e-10` | released |
 | `052` | Independent membrane, bending, shear and twist patch/sign/component checks pass. | `Mitc4ShellPatch.ReproducesIndependentMembraneBendingShearAndTwistFields`; PhysicalRecovery tests; BT | PE recovery sign checks | released |
 | `053` | Formulation invariants/patches and declared S4 displacement reference case pass; expanded portfolio is not required. | Kernel/Patch/PhysicalRecovery suites; `Mitc4S4Reference.*`; BT | RV blocking U `147/147`; PE coverage audit | released |
 | `054` | Exact geometry acceptance/rejection tests pass without NR-O03/NR-O04 calibration. | `Mitc4Geometry.*`; BT | N/A | released |
 | `055` | Additional curved/locking/convergence benchmarks remain optional and nonblocking. | Implementation-plan scope audit; BT/PE coverage inventory | PE records limitation and approved coverage | released |
 | `056` | Exact drilling formula, symmetry/positivity/rank/determinism and recovery exclusion are verified. | `Mitc4ShellDrilling.*`; Kernel/Sparse/Recovery suites; BT | PE drilling separation evidence | released |
 | `057` | Physics verifies equilibrium, direction, symmetry, energy, signs and resultant consistency. | ResultRecovery/CLI suites; BT | PE all documented checks pass | released |
 | `058` | Every matched U row uses fixed absolute `1.0e-5` and blocks on exceedance. | `Mitc4ReferenceComparison.AppliesFixedAbsoluteToleranceWithoutScaleClampOrRowDenominator`; `Mitc4S4Reference.*`; BT | RV U `147/147` pass | released |
 | `059` | Reference scale, row denominator, component magnitude and zero clamp never alter MITC4 tolerance. | Fixed-tolerance comparator test; BT | RV all 294 tolerances exactly `1.0e-5` | released |
 | `060` | U tolerance is in user-consistent length units and independent of B33 policy. | Comparator contract test and scope audit; BT | RV reports independent fixed policy | released |
 | `061` | UR uses fixed absolute `1.0e-5`; exceedance warns deterministically and never blocks. | `Mitc4ReferenceComparison.RotationExceedanceWarnsWithoutBlockingTranslationVerdict`; BT | RV UR `147/147`, zero warnings | released |
 | `062` | UR tolerance is dimensionless and no extra UR/drilling threshold is required. | Comparator/report tests; BT | RV fixed-tolerance metrics | released |
 | `063` | Missing/extra/duplicate/nonfinite/schema/identity mismatch fails before tolerance. | `Mitc4ReferenceComparison.RejectsInvalidInventoryBeforeNumericComparison`; BT | RV all invalid counts zero | released |
 | `064` | Report contains every U/UR decision, maximum, normalized, RMS, vector and worst-row evidence. | `Mitc4ReferenceComparison.ReportsMetricsVectorsWorstRowAndJsonDeterministically`; BT | RV complete quantity/component/worst-row tables | released |
 | `065` | Exact S4 input and displacement CSV paths are used without mutation. | `Mitc4S4Reference.*`; comparator required-file test; BT hash audit | `shell-s4`; immutable hashes match | released |
 | `066` | S4R artifacts are not required/consumed; parser/common-kernel/assembly/HDF5 tests cover S4R. | Mapper identity, S4/S4R assembly parity, HDF5 source-type tests; BT | RV confirms `reference/shellR/` not consumed | released |
 | `067` | Only declared input/CSV, FESA HDF5, mapping and tolerance/precheck rules gate readiness. | `Mitc4ReferenceComparison.RequiresOnlyDeclaredInputCsvAndHdf5`; BT | RV no administrative artifact gate | released |
 | `068` | Reference rows are unique, finite and deterministically source-mapped without internal-equivalence inference. | Comparator mapping and invalid-inventory tests; BT | RV exact `294/294` key set | released |
 | `069` | Sole Abaqus case is full-integration S4; S4R coverage remains non-reference. | Common quadrature/S4R mapping tests and `Mitc4S4Reference.*`; BT | RV one declared case, S4R excluded | released |
 | `070` | Authoritative FESA HDF5 rows are compared directly by model/step/frame/source/component. | Comparator mapping/E2E tests; BT | RV direct HDF5 projection, no FESA CSV | released |
 | `071` | Reaction/stress/strain/resultants do not become undeclared equality gates. | Comparator only projects U/UR; BT | RV and PE keep optional CSVs out of pass/fail | released |
 | `072` | No Abaqus/reference-solver execution or reference artifact mutation occurs. | PH/BT Git and hash audits | RV and PE no-change assertions; immutable hashes match | released |
 No requirement is deferred or blocked. Out-of-scope behavior is documented as a limitation rather than silently accepted.
 ## Validation Evidence
 | command or report | expected | observed | verdict |
 | --- | --- | --- | --- |
 | config-resolved VS18/MSVC x64 Debug fresh configure and clean build | exit `0`, no new warning | exit `0`; warning/error scan `0/0` | pass |
 | focused model/kernel/assembly/recovery CTest | pass | `87/87` | pass |
 | focused linear-static lifecycle CTest | pass | `10/10` | pass |
 | focused MITC4 reference CTest | pass | `8/8` | pass |
 | CTest discovery and full regression | nonzero inventory and all pass | `144` discovered; `144/144` pass; current read-only discovery includes 57 test names containing `Mitc4` or `Shell` | pass |
 | Harness Python verification | pass because Harness runner changed on the feature branch | `7/7` pass | pass |
 | final release-stage confirmation | current HEAD build, full CTest and Harness self-test pass | fresh `cmake --build` exit `0`; CTest `144/144`; Harness pytest `7/7` | pass |
 | Harness implementation ledger | every Step completed successfully | Steps `0-13` completed; `14/14` output `exitCode=0` | pass |
 | reference verification | `pass-for-physics-evaluation` | exact 294 rows; U `147/147`; invalid rows/warnings `0` | pass |
 | physics evaluation | `pass-for-release-agent` | all equilibrium/direction/symmetry/recovery/energy checks pass | pass |
 | immutable reference audit | exact expected hashes, no Git reference diff/status | both hashes match; zero changed reference paths | pass |
 The Release Agent did not run Abaqus. It independently read the complete upstream evidence chain, enumerated current CTest discovery read-only, checked all Harness output exit codes, verified source HEAD/branch/status, and recomputed the declared artifact/report hashes. The primary audit then performed a fresh current-HEAD incremental full build, full CTest run and Harness self-test as the final completion check; all passed as recorded above.
 ## Release Checklist
 - [x] One `feature_id` across all required gate documents.
 - [x] Requirements, research, formulation, numerical review, I/O, reference-model and implementation-plan gates are approved/passing for their intended downstream phase.
 - [x] Harness implementation is complete at the audited source HEAD with 14 successful Step outputs.
 - [x] Independent Build/Test status is `pass-for-reference-verification`.
 - [x] Reference Verification status is `pass-for-physics-evaluation`.
 - [x] Physics Evaluation status is `pass-for-release-agent`.
 - [x] All `must` requirements `001-072` trace to acceptance criteria, test/phase evidence, reference/physics evidence where applicable, and a released disposition.
 - [x] Sole required comparison files exist, match approved hashes, and were not modified.
 - [x] Fixed MITC4 tolerance and U-blocking/UR-warning-only policy are unchanged.
 - [x] No unresolved build, test, reference, physics, schema, identity, nonfinite or environment failure remains.
 - [x] Known limitations, unsupported Abaqus meanings and accepted risks are documented below and in the Release Notes Draft.
 - [x] Release Agent changed only this report and performed no external release action.
 ## Known Limitations
 | limitation | category | user impact | disposition |
 | --- | --- | --- | --- |
 | One small-displacement/small-rotation linear-static step only | analysis | Nonlinear, buckling, modal, dynamic, contact and thermal models are rejected/not executed. | documented |
 | S4 and S4R are source labels for one full-integration FESA-MITC4 formulation | input/numerical | No Abaqus S4/S4R internal algorithm, reduced-integration or hourglass equivalence is claimed. | documented |
 | External acceptance uses one flat symmetric fully clamped S4 plate | verification | General curved/distorted/thin-thick convergence is not established by the source-solver comparison. | accepted risk; optional future evidence |
 | Original MITC4 membrane field is unmodified | numerical | Distorted curved meshes may exhibit membrane locking; MITC4+ performance is not claimed. | documented |
 | S4R has no blocking Abaqus reference comparison | verification | S4R support is proven by parser/common-kernel/deterministic-assembly/HDF5 metadata tests only. | approved boundary |
 | Homogeneous isotropic centered single layer with constant thickness | material/section | Composite, orthotropic, offset and variable-thickness models are unsupported. | documented |
 | Smooth geometry-derived director field only | geometry | Explicit normals and shared-node folds/hinges/intersections are unsupported; folds require duplicated nodes. | documented |
 | Nodal loads/constraints only | load | Pressure, gravity, DLOAD, body/edge/follower load are unsupported. Director-parallel moments fail as `unsupported-drilling-load`. | documented |
 | Fixed numerical drilling stabilization | numerical | It is not a physical strain/load/result channel; no calibration sweep or drilling-energy ratio is supplied. | accepted fixed policy |
 | In-plane stress only at bottom/middle/top | output | `S33` is a plane-stress assumption; `S13/S23` point stress and nodal averaging are not emitted. | documented |
 | Raw HDF5 container bytes are not a declared deterministic identity | output/evidence | Regeneration may change the raw file hash; ordered projected rows and the JSON comparison ledger are deterministic evidence. | documented, nonblocking |
 | Target-wide CTest label remains the legacy beam label | test infrastructure | MITC4 selection uses the approved exact suite regexes instead of a dedicated label. | documented, nonblocking |
 ## Release Notes Draft
 ### Feature Summary
 - Adds end-to-end single-step linear-static analysis for four-node shell inputs labeled `S4` or `S4R`, both mapped to the independent full-integration `FESA-MITC4` formulation.
 - Adds deterministic geometry-derived nodal directors, six global nodal DOFs, MITC4 transverse-shear tying, fixed nonphysical drilling stabilization, deterministic sparse assembly, full-residual reactions, physical shell recovery and failure-atomic HDF5 output.
 - Adds mandatory HDF5 nodal displacement/reaction, shell local frames, generalized strain/resultant, bottom/middle/top in-plane stress, physical energy, equilibrium and verification metrics.
 ### Verification Scope
 - Clean Visual Studio 18 2026/MSVC x64 Debug build and full `144/144` CTest regression passed with zero compiler/linker warnings.
 - All 14 Harness implementation Steps completed with recorded RED/GREEN/VERIFY evidence and successful output exit codes.
 - The sole declared S4 case matched all `147` blocking translational rows within fixed absolute `1.0e-5`; all `147` rotation rows were within the warning threshold and produced no warnings.
 - Physics checks passed for global force/moment equilibrium, full-residual reactions, displacement direction, double symmetry, generalized resultant/stress consistency, free residual, finite results and positive physical energy.
 ### Main Limitations
 - The released scope is linear static, small deformation, homogeneous isotropic single-layer MITC4 with nodal loads and constraints only.
 - Abaqus compatibility and Abaqus S4/S4R formulation equivalence are not claimed. S4R uses the same FESA full-integration kernel and is not an Abaqus reference gate.
 - Broader curved/distorted/thin-thick convergence, original-MITC4 membrane-locking characterization, nonlinear execution, distributed loads, composites, physical drilling behavior and expanded stress output remain outside this release.
 ### Artifacts
 - Release report: `docs/releases/linear-static-mitc4-shell-release.md`
 - Build/Test report: `docs/build-test-reports/linear-static-mitc4-shell-build-test.md`
 - Reference Verification report: `docs/reference-verifications/linear-static-mitc4-shell-reference-verification.md`
 - Physics Evaluation report: `docs/physics-evaluations/linear-static-mitc4-shell-physics-evaluation.md`
 - Declared reference pair: `reference/shell/shell.inp`, `reference/shell/shell displacements.csv`
 - Build-local deterministic ledger: `.harness/build/reference/mitc4-shell-s4-comparison/comparison.json`
 ## Release Verdict
 - verdict: `ready-for-release`
 - reason: all required upstream gates are present and passing; the final three mandatory handoff statuses are exactly `pass-for-reference-verification`, `pass-for-physics-evaluation`, and `pass-for-release-agent`; every `must` requirement `001-072` has a released disposition; required S4 artifacts and row mappings are present and valid; no unresolved defect, missing comparison file, tolerance conflict, nonfinite result, identity gap, or physics blocker remains.
 - approval_scope: internal feature release closure only
 - external_release_action: `none`
 ## Handoff Recommendation
 | target_agent | reason | required_input |
 | --- | --- | --- |
 | Coordinator Agent | Close the feature workflow with `ready-for-release`. | This report, source HEAD `820ba30c717b3d0e113775608e20dfd5fbc05d53`, and the three passing downstream gate reports. |
 | Correction Agent | N/A; no implementation-owned release blocker remains. | N/A |
 | Reference Verification Agent | N/A; the required S4 comparison is complete and passing. | N/A |
 | Physics Evaluation Agent | N/A; physics evaluation is complete and passing. | N/A |
 ## No-Change Assertion
 - source_files_modified: `false`
 - test_files_modified: `false`
 - cmake_files_modified: `false`
 - requirements_modified: `false`
 - research_modified: `false`
 - formulation_modified: `false`
 - numerical_review_modified: `false`
 - io_contract_modified: `false`
 - reference_model_contract_modified: `false`
 - implementation_plan_or_phase_files_modified: `false`
 - build_test_report_modified: `false`
 - reference_verification_report_modified: `false`
 - physics_evaluation_report_modified: `false`
 - reference_artifacts_modified: `false`
 - tolerance_policies_modified: `false`
 - Abaqus_or_other_reference_solver_executed: `false`
 - publish_deploy_package_tag_commit_performed: `false`
 - owned_report_created: `true`
 - pre_existing_untracked_reports_preserved: `true`
 - notes: before this report was created, the worktree had no tracked/staged diff and contained only the three upstream gate reports as untracked files. This audit adds only `docs/releases/linear-static-mitc4-shell-release.md`; generated build-local evidence remains ignored under `.harness/build/`.
 ## Open Issues
 - blocking: `none`
 - deferred requirements: `none`
 - unresolved defects: `none`
 - missing required comparison files or mappings: `none`
 - nonblocking administrative note: the Build/Test, Reference Verification, Physics Evaluation and this Release report are untracked workspace reports pending whatever repository-integration action the user or Coordinator Agent separately authorizes. Their untracked state does not invalidate their content or the current internal readiness verdict.
 - nonblocking evidence note: raw `results.h5` hashes can differ across valid regenerations; no byte-identical HDF5 container claim is made.