adventure_node_edges table (from/to/label). AdventureNodeEdge model + policy + controller. adventure-graph Stimulus controller (auto grid layout, SVG bezier edges with arrowheads). Graph tab on adventure show with Add/Remove connection form. 3 MCP tools (add/remove/list_adventure_node_edges), get_adventure returns edges. 5 new tests, 637 total green. ADR-0072.
BL-081
Shipped