fix modifications to PostActingEvent in Hook not taking effect as expected

[LearningGp]

fix modifications to PostActingEvent in Hook not taking effect as expected

AgentScope-Java Version

1.0.0

Description

Modified the ToolResult in the PostActingEvent hook, but changes aren't being reflected.

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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