feat(subagent): enhance event forwarding with rich metadata

[AlbumenJ]

Change-Id: Iae897d08d190ef1fdf65e8e16a8d6cb29da818f1

AgentScope-Java Version

[The version of AgentScope-Java you are working on, e.g. 1.0.6, check your pom.xml dependency version or run mvn dependency:tree | grep agentscope-parent:pom(only mac/linux)]

Description

[Please describe the background, purpose, changes made, and how to test this PR]

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[Copilot]

Pull request overview

This PR enhances the SubAgentTool's event forwarding mechanism by adding rich metadata to forwarded events. The changes enable parent agents to identify which sub-agent generated an event and track the session context, improving observability and debugging capabilities.

Changes:

• Modified forwardEvent method to include metadata map with sub-agent information (name, ID, session ID, and original event)
• Added Jackson annotations to Event class for proper JSON serialization/deserialization support
• Replaced unused StreamOptions parameter with relevant Agent and sessionId parameters

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
agentscope-core/src/main/java/io/agentscope/core/tool/subagent/SubAgentTool.java	Enhanced forwardEvent method to create ToolResultBlock with metadata map containing sub-agent context
agentscope-core/src/main/java/io/agentscope/core/agent/Event.java	Added @JsonCreator, @JsonProperty, and @JsonIgnoreProperties annotations to support JSON serialization

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...io/agentscope/core/tool/subagent/SubAgentTool.java	50.00%	0 Missing and 4 partials ⚠️
...agentscope/core/agui/adapter/AguiAgentAdapter.java	0.00%	0 Missing and 1 partial ⚠️

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