FESADev/docs/linear-static-mitc4-shell/release.md

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

• One feature_id across all required gate documents.
• Requirements, research, formulation, numerical review, I/O, reference-model and implementation-plan gates are approved/passing for their intended downstream phase.
• Harness implementation is complete at the audited source HEAD with 14 successful Step outputs.
• Independent Build/Test status is pass-for-reference-verification.
• Reference Verification status is pass-for-physics-evaluation.
• Physics Evaluation status is pass-for-release-agent.
• All must requirements 001-072 trace to acceptance criteria, test/phase evidence, reference/physics evidence where applicable, and a released disposition.
• Sole required comparison files exist, match approved hashes, and were not modified.
• Fixed MITC4 tolerance and U-blocking/UR-warning-only policy are unchanged.
• No unresolved build, test, reference, physics, schema, identity, nonfinite or environment failure remains.
• Known limitations, unsupported Abaqus meanings and accepted risks are documented below and in the Release Notes Draft.
• 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.