docs: align consolidated solver workflow

phases/linear-static-3d-euler-beam/step1.md

@@ -11,16 +11,16 @@
 - `/AGENTS.md`
 - `/docs/SOLVER_AGENT_DESIGN.md`
 - `/docs/research/README.md`
-- `/docs/requirements/linear-static-3d-euler-beam.md`
+- `/docs/linear-static-3d-euler-beam/requirements.md`
 - `/docs/superpowers/specs/2026-08-08-linear-static-3d-euler-beam-design.md`
-- `/docs/formulations/3d-isoparametric-euler-beam-formulation.md`
+- `/docs/linear-static-3d-euler-beam/formulation.md`
 
 Step 0 산출물과 phase index의 완료 summary를 확인한 뒤 작업하라.
 
 ## 작업
 
 FEM wiki에서 다음 연구 질문을 query하고
-`docs/research/linear-static-3d-euler-beam-research.md`를 생성하라.
+`docs/linear-static-3d-euler-beam/research.md`를 생성하라.
 
 - Abaqus B31과 B33의 formulation 차이 및 B33을 Euler–Bernoulli 의미로 사용하는 근거
 - 2절점 spatial Euler beam의 cubic Hermite interpolation, 6 rigid modes, rank 6,
@@ -41,7 +41,7 @@ wiki page identity, 원 출처/매뉴얼 identity, reliability tier와 적용
 ## Acceptance Criteria
 
 ```powershell
-$path = 'docs/research/linear-static-3d-euler-beam-research.md'
+$path = 'docs/linear-static-3d-euler-beam/research.md'
 if (-not (Test-Path $path)) { throw "Missing $path" }
 $required = @(
   'status: `ready-for-formulation`',