Amazon Bedrock AgentCore Memory now supports cross-account access

Summary

• Introduced cross‑account access for Amazon Bedrock AgentCore Memory, allowing memory resources and agents to span multiple AWS accounts.
• Access is granted via resource‑based policies, enabling principals to create events, write/read records, and perform semantic search across accounts using full memory ARN.
• Memory delivery destinations (S3, SNS, Kinesis Data Streams) can now reside in a different account, supporting cross‑account event streaming.