docs: align consolidated solver workflow

phases/linear-static-3d-euler-beam/step5.md

@@ -11,11 +11,11 @@
 - `/AGENTS.md`
 - `/docs/SOLVER_AGENT_DESIGN.md`
 - `/docs/reference-models/README.md`
-- `/docs/requirements/linear-static-3d-euler-beam.md`
-- `/docs/research/linear-static-3d-euler-beam-research.md`
-- `/docs/formulations/3d-isoparametric-euler-beam-formulation.md`
-- `/docs/numerical-reviews/linear-static-3d-euler-beam-review.md`
-- `/docs/io-definitions/linear-static-3d-euler-beam-io.md`
+- `/docs/linear-static-3d-euler-beam/requirements.md`
+- `/docs/linear-static-3d-euler-beam/research.md`
+- `/docs/linear-static-3d-euler-beam/formulation.md`
+- `/docs/linear-static-3d-euler-beam/numerical-review.md`
+- `/docs/linear-static-3d-euler-beam/io.md`
 - `/docs/superpowers/specs/2026-08-08-linear-static-3d-euler-beam-design.md`
 - `/reference/cantilever beam/cantilever beam.inp`
 - `/reference/cantilever beam/cantilever beam displacements.csv`
@@ -24,7 +24,7 @@
 
 ## 작업
 
-`docs/reference-models/linear-static-3d-euler-beam-reference-models.md`를 생성하라.
+`docs/linear-static-3d-euler-beam/reference-model.md`를 생성하라.
 Metadata status는 `ready-for-implementation-planning`으로 둔다.
 
 - code verification, analytical solution verification, B33 reference comparison을 분리한다.
@@ -48,7 +48,7 @@ Metadata status는 `ready-for-implementation-planning`으로 둔다.
 ## Acceptance Criteria
 
 ```powershell
-$path = 'docs/reference-models/linear-static-3d-euler-beam-reference-models.md'
+$path = 'docs/linear-static-3d-euler-beam/reference-model.md'
 if (-not (Test-Path $path)) { throw "Missing $path" }
 $artifacts = @(
   'reference/cantilever beam/cantilever beam.inp',