AI-assisted debugging in Studio's AI Assistant

Add AI-assisted debugging to Studio's built-in AI Assistant so developers can investigate runtime problems using the actual state of a running Objo project.

The assistant should be able to explain a paused breakpoint or exception, inspect the call stack and relevant variables, follow execution with debugger controls, and use that evidence to identify the cause of a problem. Developers should also be able to ask the assistant to investigate while they reproduce an issue in the application.

Example requests:

• "Explain why the debugger stopped here."
• "When I click Save, the wrong customer gets updated. Help me debug it; I will reproduce the problem."
• "Find where this value changes and explain why."

When code editing is enabled, the assistant can use its existing editing tools to propose or apply an undoable fix and check compilation. Runtime verification must distinguish a successful compile from a reproduced and verified fix.

This feature is available only within Studio's AI Assistant. Debugging through MCP or other external agents is outside this request.