docs: align consolidated solver workflow

phases/linear-static-3d-euler-beam/step6.md

@@ -13,18 +13,18 @@
 - `/docs/implementation-plans/README.md`
 - `/docs/build-test-reports/README.md`
 - `/docs/corrections/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/reference-models/linear-static-3d-euler-beam-reference-models.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/linear-static-3d-euler-beam/reference-model.md`
 - `/docs/superpowers/specs/2026-08-08-linear-static-3d-euler-beam-design.md`
 - `/phases/linear-static-3d-euler-beam/step7.md`부터 `/step24.md`까지
 
 ## 작업
 
-`docs/implementation-plans/linear-static-3d-euler-beam.md`를 생성하라. 승인 설계가 이
+`docs/linear-static-3d-euler-beam/implementation-plan.md`를 생성하라. 승인 설계가 이
 경로를 명시하므로 README의 기본 suffix보다 이 경로를 우선한다.
 
 - Metadata와 Readiness Check를 작성하고 upstream status가 모두 준비된 경우
@@ -49,7 +49,7 @@
 ## Acceptance Criteria
 
 ```powershell
-$path = 'docs/implementation-plans/linear-static-3d-euler-beam.md'
+$path = 'docs/linear-static-3d-euler-beam/implementation-plan.md'
 if (-not (Test-Path $path)) { throw "Missing $path" }
 $required = @(
   'status: `ready-for-implementation`',