Rebuild the multiplayer layer on stock MultiplayerSpawner/Synchronizer so
adding an object to the game needs no networking code.
MultiplayerSpawner only replicates node creation and deletion, so "sync
everything regardless of what it is" has to come from a SceneReplicationConfig
built by convention in code. NetReplication does that, giving every node two
generated synchronizers: NetSync for script state (always server-owned) and
NetXform for position (handed to whoever is holding the object).
test/spike/ establishes the four engine behaviours the design rests on. Two
are worth flagging: per-peer visibility CANNOT be used to stop the server
fighting a client's held object, because MultiplayerSpawner despawns and
respawns the node on every visibility flip; and set_visibility_for is only an
override on top of public_visibility, so calling it alone does nothing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
algodoogle
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