Clear the context after handoff to other agents

### Describe the feature or problem you'd like to solve

Agent A has `handoff:true` for the Agent B. After the Agent A completes the task, the context window is nearly full. It leads to the agent B won't have enough context window to properly do the task.

### Proposed solution

Should compact the conversation and give the next agent a clear context window

### Example prompts or workflows

_No response_

### Additional context

_No response_