orion-ecs / keen-eye / 20011556492 / 1

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Refactor World class using facade pattern with internal managers

Extract specialized manager classes from the monolithic World class per ADR-001:

- HierarchyManager (469 lines): Parent-child entity relationships
- SystemManager (407 lines): System registration, ordering, execution
- PluginManager (176 lines): Plugin lifecycle management
- SingletonManager (95 lines): World-level data storage
- ExtensionManager (93 lines): Plugin-provided APIs

World now acts as a thin facade, delegating to focused managers while
maintaining the public API. This reduces World.cs from 3,073 to 2,338
lines (~24% reduction) and improves testability and maintainability.

Closes #82

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