Save / replication wire version

Contract

This axis is independent of:

• abi_version_current
• world_api_version_current / host_api_version_current
• Scene descriptor version
• SDK VERSION / CONTENT_HASH

Field identity on the wire is net_id (stable u16 ordinals declared on replicated component properties). Component runtime ids are generation-local and never serialized.

What exists today

• Per-component single baseline column + precise dirty bit (one stream / save consumer, not per-connection ack points).
• changedSince(index, since) requires precise dirty and version tick strictly after since.
• Full/delta codecs over native POD field slices (host endian/layout).
• NetId → handle slot + generation (cleared on handle invalidate/release).
• Authority helpers for debug panics / release drop.

Explicit non-goals / not production-ready

• No multi-client independent baselines.
• No endian-neutral / padding-free schema compiler for pointers or slices.
• No transport, prediction, interpolation, or rollback.
• No production consumers outside tests and experimental hooks.

Treat this document as the version pin for the hook API, not as a claim that networked multiplayer is done.

Bump wire_version only when the binary layout or net_id assignment rules change incompatibly.