topics/assemblies guide

Objects built from parts: named slots (sockets, mount points, hardpoints) that other parts fill, parts that declare which slots they fit, and an assembly that picks a part for every slot from Luau, swaps one at runtime while the rest keeps its state, explains why a part does not fit, and saves, syncs and undoes what fills each slot. A car with wheel, engine and seat slots, a mech's weapon hardpoints, a modular building, a character's equipment points.

Surfaced through guides { path: "topics/assemblies" } and man topics/assemblies. The content lives in guide.md.