Design for unifying /documents and /documents/files under a single hub
with stacked Signing/Files sections, owner-grouped aggregation across
the relationship graph, and three system-managed entity-folder roots
(Clients/Companies/Yachts) with lazy per-entity subfolders. Documents
hub stays anchored on document_folders; files gain folder_id; signed
PDFs auto-deposit on Documenso completion. Includes 14+ edge-case
decisions, schema deltas, backfill plan, and implementation surface.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>