fix: skip compressed assistant tool calls

[guslegend0510]

背景

在 AutoContext 压缩场景下，assistant 消息会带有 _compress_meta 标记。原有逻辑在提取最近工具调用时，可能把这些压缩后的消息当成新的工具调用上下文，导致后续轮次恢复出的工具调用不正确，甚至出现重复执行风险。

修改内容

• 在 MessageUtils.extractRecentToolCalls() 中跳过带 _compress_meta 的 assistant 消息。
• 避免压缩消息污染“最近工具调用”的提取结果。
• 保持普通 assistant 消息和原有工具调用处理逻辑不变。

验证

• mvn -pl agentscope-core -am -Dtest=MessageUtilsTest test

Fixes #1482

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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