feat(HITL): Emit UserConfirmResultEvent when resuming permission HITL

[jujn]

Summary

• Emit UserConfirmResultEvent when ReActAgent accepts ConfirmResult payloads while resuming permission HITL.
• Persist the pending confirmation request replyId on the live assistant message so the result event can correlate with the earlier RequireUserConfirmEvent.
• Validate that resume ConfirmResults fully cover all current ASKING tool calls before emitting the event or mutating context.
• Update HITL tests and event docs for the new resume-event behavior.

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

[gemini-code-assist]

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[codecov]

Codecov Report

❌ Patch coverage is 69.69697% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...e/src/main/java/io/agentscope/core/ReActAgent.java	69.23%	9 Missing and 11 partials ⚠️

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