Two-table connector diagrams (Style A) for relationships, resolving
ADR-0016 OOS-1 and the open half of requirements.md V1. Reach is
'relationship-relevant' (show relationship / show table / relationship
DDL echoes; incidental echoes keep prose). App-side rendering, width-
adaptive side-by-side vs vertical, compound-FK pair routing, bold box
title rows. Revised after a /runda DA pass corrected three inverted-
architecture claims (App-side rendering, untracked output width,
prose-in-worker show-relationship).
Index updated per ADR-0000.