fix(core): use @JsonProperty on Event.isLast() to preserve JSON key

[LearningGp]

AgentScope-Java Version

1.0.10

Description

fix(core): use @JsonProperty on Event.isLast() to preserve JSON key

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

Fixes Jackson JSON serialization of Event.isLast so the emitted JSON key remains isLast (instead of being normalized to last via JavaBeans boolean getter conventions), keeping serialization consistent with existing constructor-based deserialization.

Changes:

• Annotate Event.isLast() with @JsonProperty("isLast") to force the JSON property name during serialization.
• Add a regression test verifying JSON output contains "isLast" (and not "last") and that round-trip deserialization preserves the value.

Reviewed changes

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

File	Description
agentscope-core/src/main/java/io/agentscope/core/agent/Event.java	Adds @JsonProperty("isLast") to the boolean getter to preserve the intended JSON key on serialization.
agentscope-core/src/test/java/io/agentscope/core/agent/EventTest.java	Adds a regression test covering the JSON key name and round-trip behavior for isLast.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[chickenlj]

LGTM.