fix: retry transient AI agent overload errors

[ModerRAS]

Summary

• retry AI agent executions when providers return transient overload signals like HTTP 529 and overloaded_error
• use exponential backoff in AgentLoopService and reuse recovery suppression so retried runs do not replay duplicate snapshots
• add integration tests covering successful retry, retry exhaustion, and non-transient failures

Validation

• dotnet build TelegramSearchBot.sln -c Release
• dotnet test TelegramSearchBot.sln -c Release --no-build

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5048f3b3-c62c-4491-a640-ea1f4e17a275

📥 Commits

Reviewing files that changed from the base of the PR and between 75286a9 and 0e6a077.

📒 Files selected for processing (2)

• TelegramSearchBot.LLMAgent/Service/AgentLoopService.cs
• TelegramSearchBot.Test/Service/AI/LLM/AgentIntegrationTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/agent-overload-retries

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[github-actions]

🔍 PR检查报告

📋 检查概览

• PR: fix: retry transient AI agent overload errors #276
• 分支: fix/agent-overload-retries → master
• 触发事件: pull_request
• 提交: 8051783

🧪 测试结果

平台	状态	详情
Ubuntu	🔴 失败	测试结果不可用
Windows	🔴 失败	测试结果不可用

📊 代码质量

• ✅ 代码格式化检查
• ✅ 安全漏洞扫描
• ✅ 依赖包分析
• ✅ 代码覆盖率收集

📁 测试产物

• 测试结果文件已上传为artifacts
• 代码覆盖率已上传到Codecov

🔗 相关链接

• PR页面
• Actions日志

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此报告由GitHub Actions自动生成