fix(extensions-agui): convert SUMMARY events to AG-UI messages (#1029)

[lynx009]

Description

Fixes #1029.

When a ReAct agent reaches maxIters, AgentScope emits a SUMMARY event as a fallback response.
Before this change, extensions-agui only converted REASONING events into AG-UI text events, so the client only received RUN_FINISHED and could not see the summary content.

This PR updates the AG-UI adapter to also convert EventType.SUMMARY using the existing text-message mapping path.
As a result, when the agent stops because it exceeds maxIters, the frontend can still receive the final summary content through AG-UI events.

Changes included:

• Handle EventType.SUMMARY in the AG-UI adapter
• Reuse the existing text/reasoning event conversion flow
• Add regression tests for normal summary and streaming summary cases

How to verify:

• Configure an agent with maxIters=1
• Send a request that requires at least one tool call before producing the final answer
• Before the fix:
  • the AG-UI stream ends after TOOL_CALL_RESULT with RUN_FINISHED
  • no assistant summary text is delivered
• After the fix:
  • the AG-UI stream includes TEXT_MESSAGE_START / TEXT_MESSAGE_CONTENT / TEXT_MESSAGE_END
  • the summary content is visible to the client

Checklist

• Code has been formatted
• All tests are passing
• Javadoc comments are complete and follow project conventions
• Code is ready for review

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull request overview

This PR fixes extensions-agui event conversion so that AgentScope EventType.SUMMARY events (emitted as a fallback when a ReAct agent hits maxIters) are converted into AG-UI text-message events, ensuring the client receives the summary content instead of only RUN_FINISHED.

Changes:

• Extend AguiAgentAdapter conversion logic to treat EventType.SUMMARY like EventType.REASONING for text/reasoning block mapping.
• Update adapter Javadoc to reflect SUMMARY event mapping.
• Add regression tests covering both single-chunk and multi-chunk streaming summary scenarios.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
agentscope-extensions/agentscope-extensions-agui/src/main/java/io/agentscope/core/agui/adapter/AguiAgentAdapter.java	Adds EventType.SUMMARY handling to the existing REASONING conversion path and updates the documented event mapping.
agentscope-extensions/agentscope-extensions-agui/src/test/java/io/agentscope/core/agui/adapter/AguiAgentAdapterTest.java	Adds tests verifying SUMMARY events are converted into AG-UI TEXT_MESSAGE_* events for both non-streaming-like and streaming-like summary emissions.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...agentscope/core/agui/adapter/AguiAgentAdapter.java	66.66%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[lynx009]

Setting maxIters to 1, the single round ReAct test samples are as follows, and the same results are obtained for multiple rounds of ReAct test samples.

Before the fix:

When reaching maxIters, it is necessary to inquire about the results again:

After the fix: