orion-ecs / keen-eye / 20587004827 / 1

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Add entity hierarchy replication

Server side:
- Add SendHierarchyChange() to broadcast parent changes to all clients
- Add SendHierarchySnapshot() to send all parent-child relationships
- Include hierarchy in full snapshot flow for late joiners
- Use HierarchyChange (0x18) message type

Client side:
- Handle HierarchyChange message to apply SetParent()
- Look up child and parent by network ID
- Support parentNetworkId=0 for orphaning (no parent)

Protocol:
- Add HierarchyChange message type (0x18)
- Add WriteHierarchyChange/ReadHierarchyChange helpers

Game code calls SendHierarchyChange() when parent changes on server.
Late joiners receive all current hierarchy relationships after snapshot.

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