Merge https://github.com/google/adk-python/pull/3546 Co-authored-by: Xuan Yang <xygoogle@google.com> COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3546 from ryanaiagent:feat/stale-issue-agent bcf45098c1c6406b4a42228e4a8ef02f12840425 PiperOrigin-RevId: 835327931