✓ mid-collections :: SparseSet
SparseSet<I: SparseSetIndex, T>
swap-and-pop, u32::MAX sentinel, no paging — see docs/mid-collections.md
⚠ mid-collections :: rest
generational arena · ring buffer · bitset · std::hive · FFI wrapper
design-doc only — pulled in piece-by-piece as mid-ecs actually needs each one
⚠ mid-ecs :: World
entity allocator
planned next — the generational-arena piece defines what an Entity handle looks like
⚠ mid-ecs :: Archetype
SoA table storage — the "Archetype Core"
stub — see docs/mid-ecs.md's Hybrid ECS Architecture section
⚠ mid-ecs :: Query
parallel iteration via rayon
stub — needs Archetype/World first
⚠ mid-ecs :: sync
mid-net replication hooks
stub — the network-sync-from-day-one piece
⚠ mid-ecs :: ffi
C ABI
stub — same treatment mid-net's ffi.rs got once there's something real to expose