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+# PLAN.md
+
+## Purpose
+
+이 파일은 여러 AI Agent가 같은 작업을 이어받을 때 현재 목표와 실행 계획을 빠르게 파악하기 위한 공유 계획서이다.
+
+## Current Objective
+
+3D Euler-Bernoulli beam Abaqus/Standard `UEL` 구현을 하네스 phase 흐름에 따라 진행한다.
+
+## Active Phase
+
+- Phase directory: `phases/uel-3d-euler-beam`
+- Current planned entry point: `python scripts/execute.py uel-3d-euler-beam`
+- First pending step: `step0` requirements
+
+## Planned Steps
+
+1. Requirements: `docs/requirements/uel-3d-euler-beam.md`
+2. Research: `docs/research/uel-3d-euler-beam-research.md`
+3. Formulation: `docs/formulations/uel-3d-euler-beam.md`
+4. Numerical review: `docs/numerical-reviews/uel-3d-euler-beam.md`
+5. Interface contract: `docs/io-definitions/uel-3d-euler-beam.md`
+6. Test/reference model plan: `docs/reference-models/uel-3d-euler-beam.md`
+7. RED no-Abaqus Fortran tests and manifest
+8. GREEN Fortran implementation
+9. Validation, physics sanity, and readiness audit
+
+## Success Criteria
+
+- Every must requirement has verification method, acceptance criteria, and tolerance or decision owner.
+- Fortran production changes follow RED -> GREEN -> VERIFY.
+- No-Abaqus tests pass through `python scripts/validate_fortran.py` when compiler and manifest are available.
+- Workspace validation passes through `python scripts/validate_workspace.py`.
+- Solver-result validation is marked complete only after externally generated ODB-extracted CSV artifacts are provided and validated.
+
+## Out Of Scope Until Explicitly Approved
+
+- Running Abaqus jobs from this repository.
+- Direct ODB parsing in this repository.
+- Fabricating reference CSV, `.msg`, `.dat`, `.log`, or `.sta` evidence.
+- Geometric nonlinearity, Timoshenko shear deformation, mass, damping, distributed loads, plasticity, damage, thermal strain, warping torsion, and section offsets for the first UEL implementation.
+
+## Open Decisions
+
+- Confirm exact first-scope beam assumptions in the requirements step.
+- Decide `PROPS`/`JPROPS` ordering and orientation-vector convention in the interface step.
+- Decide exact no-Abaqus Fortran source and test file layout in the reference model step.