hypercross 48f3319615 feat: add relationship components and reverse indexing ... Introduces a relationship system to allow entities to point to other entities. Includes a `Relationship<TSelf, TTarget>` component and a `RelationshipIndex` to enable efficient reverse lookups (finding all sources pointing to a specific target). The `World.DestroyEntity` method now performs cascading removals: - Relationships where the entity is the source are removed. - Relationships where the entity is the target are removed from their respective source entities. Also adds MessagePack support to `Entity` and `Relationship`.		2026-07-18 19:42:59 +08:00
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OECS.Tests	feat: add relationship components and reverse indexing	2026-07-18 19:42:59 +08:00