统一PC前端布局密度（05-28-pc-frontend-layout-unification）

.trellis/tasks/05-28-pc-frontend-layout-unification/implement.jsonl

@@ -0,0 +1,4 @@
+{"file": ".trellis/spec/hyb-oa/project-governance.md", "reason": "Trellis task, approval and commit boundaries for implementation"}
+{"file": ".trellis/spec/hyb-oa/frontend-react-vite-design.md", "reason": "Primary frontend design and verification rules for PC OA pages"}
+{"file": ".trellis/tasks/archive/2026-05/05-27-oa-product-flow-test-policy-audit/research/overall-audit-matrices.md", "reason": "Governance review conclusions and execution roadmap"}
+{"file": ".trellis/tasks/archive/2026-05/05-27-oa-frontend-layout-page-fit-review/research/page-layout-and-fit-review.md", "reason": "Page taxonomy, fit matrix and frontend design direction"}