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Add hot reload infrastructure for editor (#590)

Implement hot reload support for the KeenEyes editor using collectible AssemblyLoadContext:

- Add GameAssemblyContext: collectible AssemblyLoadContext for loading game assemblies that can be unloaded and replaced
- Add HotReloadManager: manages file watching, project building, assembly loading/unloading, and system registration
- Add World.RemoveSystem(ISystem) and World.RemoveSystem<T>() APIs for hot reload to unregister systems
- Add comprehensive unit tests for HotReloadManager (17 tests)
- Add unit tests for World.RemoveSystem APIs (9 tests)

Hot reload workflow:
1. FileSystemWatcher detects .cs file changes
2. Debounce multiple rapid changes (configurable delay)
3. Unregister all game systems from the world
4. Unload previous AssemblyLoadContext
5. Rebuild project via dotnet build
6. Load new assembly into fresh collectible context
7. Re-register systems from new assembly

Component data survives reload since it's stored as bytes in archetypes - only system logic is replaced.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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