docs: align consolidated solver workflow

docs/linear-static-mitc4-shell/io.md

@@ -3,10 +3,10 @@
 ## Metadata
 
 - feature_id: `linear-static-mitc4-shell`
-- source_requirement: `docs/requirements/linear-static-mitc4-shell.md`
-- source_research: `docs/research/linear-static-mitc4-shell-research.md`
-- source_formulation: `docs/formulations/mitc4-shell-formulation.md`
-- source_numerical_review: `docs/numerical-reviews/linear-static-mitc4-shell-review.md`
+- 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_commits: requirements/research/formulation policy revision `73df844`
 - status: `approved-for-implementation-planning`
 - owner_agent: `io-definition-agent`
@@ -629,7 +629,7 @@ administration and reference-portfolio expansion are removed scope.
 
 ### 11.2 Reference Model Agent
 
-- Write `docs/reference-models/linear-static-mitc4-shell-reference-models.md` using
+- Write `docs/linear-static-mitc4-shell/reference-model.md` using
   this exact keyword/HDF5/reference-row contract.
 - Record only the two exact existing input/displacement pairs, comparison components,
   HDF5 projection, source-row identity, fixed absolute MITC4 tolerance and immutability rule.