fix: Enable private field access in UpdateComponentTool

[CharlieHess]

Problem

The update_component tool fails when trying to modify:

1. Asset references - ScriptableObjects cannot be set by path or GUID
2. Nested fields - dot-notation paths like _eventReference._event are unsupported
3. Private serialized fields in base classes - we're not searching the inheritance hierarchy

Root cause: GetField() only searches the immediate type, and the existing UnityEngine.Object handler doesn't load assets.

Solution

Hybrid approach using SerializedObject API as primary, with enhanced reflection as fallback:

• SerializedObject.FindProperty() automatically handles base class fields and nested paths
• New GetFieldRecursive() / GetPropertyRecursive() helpers traverse the type hierarchy for non-serialized properties
• SetSerializedPropertyValue() handles all SerializedPropertyType cases including ObjectReference with asset path/GUID support
• ConvertJTokenToValue() updated to load assets by path (Assets/...), GUID ({guid: "..."}), or name search

Usage Examples

// Asset by path
{"_eventReference._event": "Assets/Events/MyEvent.asset"}

// Asset by GUID
{"_eventReference._event": {"guid": "95c910ab954254d98a9165e47e87ec9f"}}

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[CharlieHess]

This is admittedly a Cursor / Opus collaboration but for verification I'm able to wire up event listeners now, using my fork, and prior to that I was stuck on these!