chore: import upstream snapshot with attribution

python/packages/bedrock/README.md

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+# Get Started with Microsoft Agent Framework Bedrock
+
+Install the provider package:
+
+```bash
+pip install agent-framework-bedrock --pre
+```
+
+## Bedrock Integration
+
+The Bedrock integration enables Microsoft Agent Framework applications to call Amazon Bedrock models with familiar chat abstractions, including tool/function calling when you attach tools through `ChatOptions`.
+
+### Basic Usage Example
+
+See the [Bedrock sample](../../samples/02-agents/providers/amazon/bedrock_chat_client.py) for a runnable end-to-end script that:
+
+- Loads credentials from the `BEDROCK_*` environment variables
+- Instantiates `BedrockChatClient`
+- Sends a simple conversation turn and prints the response