add AWS AgentCore zero code example

[mesutoezdil]

Closes #93

Adds a zero code example for AWS AgentCore.

AgentCore runs on Strands Agents with Amazon Bedrock models.

The setup follows the same pattern as the existing Strands example: StrandsTelemetry with an OTLPSpanExporter pointed at the agentevals receiver.

To run:
pip install -r examples/zero-code-examples/agentcore/requirements.txt
export AWS_DEFAULT_REGION=us-east-1
agentevals serve --dev
python examples/zero-code-examples/agentcore/run.py

[mesutoezdil]

Imports work. OTel setup follows the same pattern as the existing Strands example. roll_die and check_prime tool logic is correct.

[mesutoezdil]

Tested the OTel pipeline locally (agentevals serve --dev) using a separate script with Strands and a Nebius Cloud endpoint in place of BedrockModel. The actual run.py was not executed end to end.
I do not have an AWS account..

What was verified:

• StrandsTelemetry sets up the tracer provider correctly
• OTLPSpanExporter sends spans to agentevals on port 4318
• roll_die and check_prime are called and captured in traces
• Sessions showed up in agentevals

What still needs AWS to verify:

• BedrockModel connecting to Amazon Bedrock
• e2e tests in tests/integration/test_live_agents.py (skipped without AWS_DEFAULT_REGION)

I think, it will work.

[krisztianfekete]

Hi, thanks for the PR!

Apologies for not being clearer in #93, but this PR seems to be adding another Strands example via Bedrock models, but not really an AgentCore example. We are looking for an example running on/using AgentCore runtime/SDK, e.g. via https://github.com/aws/bedrock-agentcore-sdk-python.

If I understand correctly, you can use agentcore dev for local testing, so having an AWS account might not be a hard requirement to test traces.

[mesutoezdil]

@krisztianfekete thanks.

Rewrote the example to use BedrockAgentCoreApp from bedrock-agentcore-sdk-python.

The handler is now an async generator decorated with @app.entrypoint and the server starts with app.run(), which is the AgentCore runtime pattern.

You were right about AWS not being a hard requirement for tracing.

Strands still exports OTLP spans even when BedrockModel raises NoCredentialsError, so all three e2e tests pass without AWS credentials.