docs: use S4-only MITC4 reference gate

docs/requirements/linear-static-mitc4-shell.md

@@ -6,11 +6,11 @@
 - title: `Linear Static MITC4 Shell`
 - status: `approved`
 - owner_agent: `requirement-agent`
-- date: `2026-08-12`
+- date: `2026-08-13`
 - approval_basis: 사용자와 확정한 선형 정적 범위, `S4`/`S4R` 매핑, 6자유도 외부 계약, drilling 안정화, 자동 director 생성, 결과 및 검증 계약
 - current_product_state: `requirements-approved-not-implemented`
 - formulation_alignment: `docs/formulations/mitc4-shell-formulation.md`는 이 baseline의 6자유도 및 고정 drilling 안정화 계약과 정렬함
-- reference_inventory_state: `reference/shell/`의 S4와 `reference/shellR/`의 S4R input/displacement CSV를 기존 경로와 이름 그대로 사용함
+- reference_inventory_state: full-integration FESA-MITC4의 Abaqus acceptance comparison은 `reference/shell/`의 S4 input/displacement CSV만 기존 경로와 이름 그대로 사용함; S4R source support는 reference artifact 없이 mapping/kernel/HDF5 tests로 검증함
 
 ## Purpose
 
@@ -59,7 +59,7 @@ Formulation, Numerical Review, I/O, Reference Model, Implementation Planning 및
 - DOF 1~6의 nodal `*BOUNDARY`와 nodal `*CLOAD`
 - deterministic assembly와 기존 linear-static partition/factorization/substitution lifecycle
 - HDF5 nodal displacement/reaction, shell generalized strain/resultant, in-plane stress, residual 및 energy output
-- element invariant, patch, 현재 S4/S4R displacement reference 및 physics verification
+- element invariant, patch, 현재 S4 displacement reference 및 physics verification
 
 ## Out Of Scope
 
@@ -165,7 +165,7 @@ Formulation, Numerical Review, I/O, Reference Model, Implementation Planning 및
 - **FESA-REQ-LSMITC4-050** — Element invariant tests shall cover frame orthonormality/handedness, Jacobian sign, stiffness symmetry, coordinate-transformation energy invariance, six physical rigid modes, deformation-mode positivity and deterministic repeatability.
 - **FESA-REQ-LSMITC4-051** — Normalized algebraic acceptance shall use `1e-12` for symmetry, frame orthonormality and transformation-energy invariance and `1e-10` for rigid-mode action, linear-system residual and global equilibrium unless Numerical Review approves and documents an evidence-backed scale-aware replacement before Implementation Planning.
 - **FESA-REQ-LSMITC4-052** — Patch verification shall independently cover constant membrane strain/stress, pure bending, transverse shear and twist, including sign and component-order checks for generalized strain, resultant and recovered in-plane stress.
-- **FESA-REQ-LSMITC4-053** — The implementation shall pass the formulation-defined element invariants and patch/manufactured tests plus the two declared S4/S4R displacement reference cases; an expanded locking, distortion or curved-shell benchmark portfolio is not an implementation-completion gate for this feature.
+- **FESA-REQ-LSMITC4-053** — The implementation shall pass the formulation-defined element invariants and patch/manufactured tests plus the declared S4 displacement reference case; an expanded locking, distortion or curved-shell benchmark portfolio is not an implementation-completion gate for this feature.
 - **FESA-REQ-LSMITC4-054** — Geometry validation tests shall cover the exact accepted/rejected conditions defined by the formulation and I/O contract; `NR-O03` smooth-director calibration and `NR-O04` distortion/warp threshold sweeps are not required tests.
 - **FESA-REQ-LSMITC4-055** — Additional pinched-cylinder, hemispherical-shell, Scordelis-Lo or mesh-convergence studies may be added later as nonblocking research or release evidence, but are not required for Implementation Planning or feature completion.
 - **FESA-REQ-LSMITC4-056** — Drilling verification shall check the fixed formula in Requirement 034, symmetry, positivity, deterministic assembly, removal of the four nonphysical local drilling null modes, and exclusion from physical recovery; coefficient sweeps and drilling-energy checks are not required.
@@ -194,14 +194,15 @@ Formulation, Numerical Review, I/O, Reference Model, Implementation Planning 및
 
 ## Reference Artifact Requirements
 
-The approved lightweight inventory uses the existing S4 and S4R paths below. These files
-remain read-only; their names are identities, not canonical/legacy-policy decisions.
+The approved lightweight acceptance inventory uses only the existing S4 paths below.
+Every file under `reference/` remains read-only; its name is an identity, not a
+canonical/legacy-policy decision.
 
 - **FESA-REQ-LSMITC4-065** — The S4 case shall use `reference/shell/shell.inp` and `reference/shell/shell displacements.csv` without creating, renaming, rewriting or repairing either file.
-- **FESA-REQ-LSMITC4-066** — The S4R case shall use `reference/shellR/shellR.inp` and `reference/shellR/shellR displacements.csv` without creating, renaming, rewriting or repairing either file.
+- **FESA-REQ-LSMITC4-066** — No S4R Abaqus artifact shall be required or consumed by this feature's reference acceptance comparison. S4R source support shall instead be verified by parser, common-kernel, deterministic assembly and HDF5 source-metadata tests; any existing `reference/shellR/` files remain untouched optional evidence.
 - **FESA-REQ-LSMITC4-067** — Reference readiness requires only the declared input and required displacement CSV, FESA `results.h5`, deterministic source-node/component mapping, and Requirements 058-063 tolerance/precheck rules. README, `metadata.json`, canonical naming, provenance, Abaqus version, duplicated model semantics, and a schema version are not required gates; a present `metadata.json` is optional read-only context.
 - **FESA-REQ-LSMITC4-068** — Artifact validation shall require unique finite displacement rows and deterministic source-node/component identity before comparison; it shall not attempt to establish Abaqus internal formulation equivalence.
-- **FESA-REQ-LSMITC4-069** — The two declared cases satisfy the required source-label coverage: `reference/shell/` covers S4 and `reference/shellR/` covers S4R. No expanded reference portfolio is required for this feature.
+- **FESA-REQ-LSMITC4-069** — The sole declared Abaqus comparison case is `reference/shell/` S4 because FESA-MITC4 uses full `2 x 2 x 2` integration. S4R source-label coverage is satisfied by the non-reference tests in Requirement 066; no expanded reference portfolio is required for this feature.
 - **FESA-REQ-LSMITC4-070** — Reference verification shall compare FESA HDF5 global nodal displacement rows directly against Abaqus displacement CSV rows by model, step/frame, source node and component identity; a FESA-generated CSV view shall not become the authoritative comparison source.
 - **FESA-REQ-LSMITC4-071** — Abaqus reaction, stress, strain and shell force/moment output may be retained as review evidence if present but shall not change the approved `U1/U2/U3` pass/fail boundary or become an undeclared equality gate.
 - **FESA-REQ-LSMITC4-072** — FESA agents shall not execute Abaqus or another reference solver and shall not generate, modify, restore or normalize reference artifacts during requirements, research, formulation, implementation or verification unless a later phase explicitly authorizes that operation.
@@ -224,12 +225,12 @@ without gaps or overlap.
 | `024-030` | Ownership, deterministic assembly and linear-static execution | architecture/execution | PRD; ADR-004/007/008/009/016/017 | must | Unit, orchestration and repeated-thread-count tests | Ownership boundaries, event order, residual reaction and deterministic bytes/rows match | `1e-12` deterministic numeric target where applicable | Numerical Review; Implementation Planning | approved |
 | `031-038` | 5-DOF physics embedded in 6-DOF with fixed drilling stabilization | numerical boundary | User approval; MITC literature and thesis 6-DOF discussion | must | Formulation review, invariant and rank tests | Exact `10^-3` positive rotational-diagonal rule; physical outputs exclude drilling | Fixed by Requirements 033-036 | Formulation; Numerical Review; Implementation Planning | approved |
 | `039-048` | Mandatory HDF5 output and failure atomicity | output | User approval; ADR-005/016/018 | must | Recovery, schema, identity, nonfinite and atomicity tests | Every quantity/location/unit/identity exists; failure commits no partial success | Exact component/location inventory; I/O Definition owns schema | Formulation; I/O Definition; Implementation Planning | approved |
-| `049-057` | TDD, invariants, patch, declared references and physics | verification | User approval; shell formulation evidence; project process | must | CTest evidence, analytical/patch tests, two reference cases and physics review | Required tests pass; removed calibration/portfolio checks are not reintroduced | `1e-12` symmetry/frame; `1e-10` rigid/residual | Numerical Review; Implementation Planning | approved |
+| `049-057` | TDD, invariants, patch, declared reference and physics | verification | User approval; shell formulation evidence; project process | must | CTest evidence, analytical/patch tests, the S4 reference case and physics review | Required tests pass; removed calibration/portfolio checks are not reintroduced | `1e-12` symmetry/frame; `1e-10` rigid/residual | Numerical Review; Implementation Planning | approved |
 | `058-060` | Translational displacement pass/fail tolerance | tolerance | User approval; B33 baseline | must | Comparator unit/integration tests and report review | Every matched U row uses `1e-9 + 1e-6*reference_scale_c` without clamp/omission | Fixed by Requirements 058-060 | Reference Verification | approved |
 | `061-062` | Rotational warning-only comparison | tolerance/warning | User approval; B33 baseline | must | Comparator/diagnostic tests and report review | UR never changes pass/fail; same mixed-tolerance exceedance emits a deterministic warning | Fixed by Requirements 061-062 | Reference Verification | approved |
 | `063-064` | Row/schema failure and report completeness | reference verification | User approval; ADR-005/014/018 | must | Negative comparator and report-schema tests | Invalid inventory fails before numeric comparison; all U/UR metrics remain visible | No ignored invalid rows | I/O Definition; Reference Verification | approved |
-| `065-068` | Exact S4/S4R reference-case inventory and row validity | reference | User declaration; ADR-019 | must | Read-only inventory and source-row/component precheck | Four declared paths exist; required rows are unique, finite and deterministically mapped | Requirements `058-063` | Reference Model; Reference Verification | approved |
-| `069-071` | S4/S4R coverage and displacement-only comparison | reference | User approval | must | HDF5-to-CSV comparison | Declared S4/S4R cases; only U blocks and UR only warns | Requirements `058-064` | Reference Verification; Physics Evaluation | approved |
+| `065-068` | Exact S4 reference-case inventory, S4R exclusion and row validity | reference | User declaration; ADR-019 | must | Read-only S4 inventory, source-row/component precheck and S4R non-consumption test | Two declared S4 paths exist; required rows are unique, finite and deterministically mapped; S4R artifacts are not required or consumed | Requirements `058-063` | Reference Model; Reference Verification | approved |
+| `069-071` | S4 reference coverage and displacement-only comparison | reference | User approval | must | HDF5-to-CSV comparison | Declared S4 case only; U blocks and UR only warns; S4R mapping remains independently tested | Requirements `058-064` | Reference Verification; Physics Evaluation | approved |
 | `072` | Reference solver/artifact immutability | governance | User/project policy; ADR-010 | must | Process audit and Git diff | No unapproved execution or artifact mutation | Exact zero mutations | All downstream agents | approved |
 
 ## Open Questions and Required Downstream Decisions
@@ -267,7 +268,8 @@ and tangent derivation may remain in the formulation document.
 
 ### Reference Model Agent
 
-- Record the exact existing S4 and S4R input/displacement CSV paths from Requirements 065-066 and keep them read-only.
+- Record only the exact existing S4 input/displacement CSV paths from Requirement 065 as acceptance artifacts and keep every existing reference artifact read-only.
+- Do not consume the S4R bundle in reference verification; route S4R source support to parser/common-kernel/HDF5 tests from Requirement 066.
 - Define only the HDF5-to-CSV source-node/component projection and the already approved B33 mixed tolerance; do not add bundle administration or portfolio gates.
 
 ### Implementation Planning Agent
@@ -275,4 +277,4 @@ and tangent derivation may remain in the formulation document.
 - Do not start until Research, revised Formulation, Numerical Review, I/O and lightweight Reference Model inventory are mutually consistent.
 - Trace every `must` requirement to RED/GREEN/VERIFY tests and preserve current solver ownership, deterministic assembly and failure-atomic HDF5 boundaries.
 - Use the project Harness skill to propose self-contained implementation Steps for user approval, then write only the approved phase-planning files; do not execute Harness without a separate explicit request.
-- Include tests for source-type mapping, auto directors, fixed drilling rank/separation, required recovery quantities, row failures and U-versus-UR comparison behavior; exclude coefficient sweeps, drilling energy and `NR-O03`/`NR-O04`.
+- Include tests for source-type mapping, auto directors, fixed drilling rank/separation, required recovery quantities, row failures and S4-only U-versus-UR comparison behavior; retain non-reference S4R source mapping coverage and exclude coefficient sweeps, drilling energy and `NR-O03`/`NR-O04`.