# Linear Static MITC4 Shell Release Report

본 문서는 당시 revision의 검증·판정 기록이다. 본문에 남긴 원본 보고서 이름과 SHA-256은
통합 전 자료의 식별자이며 정리된 현재 파일의 byte hash를 뜻하지 않는다. 원문은 Git
`858e87b`의 해당 기능 폴더에서 확인할 수 있다. 현재 진입점과 대응 기록은 [README](README.md)를 따른다.

## Metadata

- feature_id: `linear-static-mitc4-shell`
- source_requirement: `docs/linear-static-mitc4-shell/requirements.md`
- source_research: `docs/linear-static-mitc4-shell/research.md`
- source_formulation: `docs/linear-static-mitc4-shell/formulation.md`
- source_numerical_review: `docs/linear-static-mitc4-shell/numerical-review.md`
- source_io_definition: `docs/linear-static-mitc4-shell/io.md`
- source_reference_model: `docs/linear-static-mitc4-shell/reference-model.md`
- source_implementation_plan: `docs/linear-static-mitc4-shell/README.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/linear-static-mitc4-shell/verification.md`
- source_reference_verification_report: `docs/linear-static-mitc4-shell/verification.md`
- source_physics_evaluation_report: `docs/linear-static-mitc4-shell/verification.md`
- audited_source_head: `820ba30c717b3d0e113775608e20dfd5fbc05d53`
- audited_branch: `feat-linear-static-mitc4-shell`
- historical_status: `ready-for-release`
- current_status: `superseded-pending-revalidation`
- superseded_on: `2026-08-18`
- date: `2026-08-13`
- release_boundary: internal FESA feature release readiness only; no publish, deploy, package, tag, commit, or external release was performed

The readiness evidence below is historical. The 2026-08-18 common-policy reference revalidation
passed, but fresh physics and release audits are still required before a current
`ready-for-release` verdict may be issued.

## 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 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 |

## 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.

현재 build·reference·물리 실행 기록은 [검증 보고서](verification.md)에 통합했다. 과거 readiness와 현재 재검증 필요를 구분하며 이 정리는 새로운 release 감사가 아니다.