orion-ecs / keen-eye / 20631471507

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Add editor infrastructure with undo/redo, selection, and asset management

Implements Phase 2 editor infrastructure components:

- Command pattern for undo/redo (IEditorCommand, UndoRedoManager)
  - Entity commands: Create, Delete, Reparent, Rename
  - Component commands: Add, Remove, Set with merge support
  - Batching for compound operations

- SelectionManager with multi-select support
  - Primary selection tracking
  - Add/remove/toggle selection methods
  - SelectionChanged events

- AssetDatabase for project file management
  - File scanning by extension
  - FileSystemWatcher for hot reload
  - Asset type detection (Scene, Prefab, Texture, etc.)

- SceneSerializer for .kescene file format
  - JSON-based entity/hierarchy serialization
  - Save/load scene data

- Editor shell using KeenEyes.UI
  - Menu bar, toolbar, dock layout
  - Hierarchy and Inspector panels
  - EditorWorldManager for scene/editor world separation

Also adds InternalsVisibleTo for KeenEyes.Editor to access
internal APIs like World.SetName.

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

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

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