Lift the context-menu builder out of the page shell. The hook
owns ctxMenu open/close state and exposes one builder per
surface (node / net / edge / canvas); the actual operations come
in via callbacks so the page keeps its optimistic-patch logic
unchanged.
- New MazeNET/useMazeContextMenu.tsx
- useMazeContextMenu.test.ts covers menu lifecycle (open/close),
node-menu items, observed-entity locking, internet-net
delete-disabled, canvas-menu Add subnet/DMZ items, and the
edge-menu Remove invocation.
- Wiring into MazeNET.tsx lands next.
anti
f33a011900