fix: 使用 ResultMessage.result 获取最终响应

[BukeLy]

Summary

• 改用 ResultMessage.result 替代手动收集 AssistantMessage 的 TextBlock
• 符合 Claude Agent SDK 设计意图，ResultMessage.result 包含完整聚合响应
• 移除不再需要的 AssistantMessage 和 TextBlock 导入

Test plan

• 添加 tests/test_sdk_response.py 验证 SDK 消息结构
• 在 Telegram 测试 /hello-world 确认响应正常

[Copilot]

Pull request overview

This PR refactors the response handling in the Claude Agent SDK integration to use ResultMessage.result for the final aggregated response instead of manually collecting text from AssistantMessage content blocks. This aligns with the SDK's intended design pattern.

Key changes:

• Replaced manual text collection from AssistantMessage.content with direct use of ResultMessage.result
• Removed unnecessary imports of AssistantMessage and TextBlock from the main code
• Added a test file to verify SDK message structure and response handling

Reviewed changes

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

File	Description
agent-sdk-server/agent_session.py	Simplified response handling by using ResultMessage.result directly; removed handling of AssistantMessage and associated imports
tests/test_sdk_response.py	New test file to verify SDK message structure and validate the response format from both AssistantMessage and ResultMessage

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[BukeLy]

Code review

Found 1 issue:

1. Telegram standard commands bypassed to Agent - Removing the command interception logic means /start, /help, and other Telegram standard commands will be sent to the Agent for processing. This causes unnecessary Bedrock API calls and unpredictable Agent behavior for system commands that should be handled at the bot level.

https://github.com/BukeLy/OmniCloud-Ops-Agent/blob/60d074f31d516c3b7e71b78a53e0da64f80605cd/agent-sdk-client/handler.py#L38-L50

Suggestion: Consider filtering standard Telegram commands (/start, /help) while allowing custom skill commands to pass through to the Agent.

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