Add 0.6.0 Release Notes

[Copilot]

Release notes for 0.6.0 covering merged PRs from October 22nd to November 18th, 2025.

Major Features

• FastAPI Integration Package (Fastapi integration package #176) - New microsoft-agents-hosting-fastapi hosting option
• Integration Testing Framework (Integration Testing Framework #228) - microsoft-agents-testing package with agent client classes, data-driven testing, benchmarking
• Distributed Error Resources (Distribute error resources across packages with error codes and help URLs #223, Replace help_url_anchor with error_code in error message URLs #237, Move ErrorMessage to microsoft-agents-activity to resolve circular dependency #240) - Standardized error codes (-60000 to -66999 ranges) with help URLs across all packages
• TypingIndicator Simplification (TypingIndicator simplification #212) - Explicit start()/stop() API, removed async locking complexity

Bug Fixes

• ChannelServiceAdapter.create_conversation flow (Fix ChannelServiceAdapter.create_conversation implementation #233)
• Streaming disabled for agentic requests on Teams (Disable Streaming Response when channel = teams and request type is agentic. #243)
• HTTP client error handling with precise status code checks (Improved UserTokenClient and ConnectorClient status code error handling #202)
• M365Copilot channel detection (channel check changes needed for M365Copilot #208, Users/axsuarez/cheerypick 0.5 fixes #210)
• Copilot Studio client conversation ID persistence (Update conversation ID in copilot studio client when start_conversation is called #195)
• Default max conversation ID length reduced to 150 (Adjusting default max conversation id length #196)

Documentation

• Contributing guidelines for internal/external developers (Update contributing guidelines in README.md #234)
• Type hints and docstring improvements (Update parameter type hints and documentation across multiple files for clarity and consistency. #207, Users/axsuarez/cherrypick proactive and docs #214)
• CODEOWNERS unified to agents-sdk team (Update CODEOWNERS for unified team ownership #199)

Format follows existing 0.5.0 release notes structure in changelog.md.

Original prompt

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This section details on the original issue you should resolve

<issue_title>0.6.0 Release Notes</issue_title>
<issue_description>Based on the 0.5.0 release notes found here: https://github.com/microsoft/Agents-for-python/releases

Create release notes for 0.6.0

This should include check-ins between October 22nd and November 18th. This format should be Markdown. Just respond to this issue.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 0.6.0 Release Notes #269

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