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feat(editor): Add dynamic plugin loading infrastructure

Implement a tiered plugin loading system for editor plugins:

- Tier 1 (Static): Plugins loaded at startup, require editor restart
- Tier 2 (Enable/Disable): Plugins can be toggled at runtime
- Tier 3 (Hot Reload): Full assembly unload/reload for development

Key components:
- PluginManifest: JSON schema for keeneyes-plugin.json
- PluginLoadContext: Isolated AssemblyLoadContext per plugin
- PluginLoader: Handles assembly load/unload lifecycle
- PluginRepository: Discovers plugins from NuGet cache and search paths
- LoadedPlugin: Tracks plugin state through lifecycle

The EditorPluginManager is extended with:
- DiscoverPlugins(): Scan for available plugins
- LoadDynamicPlugin(): Load and enable from manifest
- EnableDynamicPlugin/DisableDynamicPlugin: Runtime toggle
- UnloadDynamicPlugin/ReloadDynamicPlugin: Hot reload support

See ADR-013 for detailed architecture decisions.

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