feat: Enable AWS X-Ray Active Tracing for Lambda and API Gateway

[Copilot]

Enables distributed tracing across the Lambda function and API Gateway to capture request flows, latency breakdowns, and error contexts in X-Ray.

Changes

CloudFormation Template (.aws/cfn-service.yml)

• Added TracingConfig: Mode: Active to Lambda function resource
• Added AWSXRayDaemonWriteAccess managed policy to Lambda execution role
• Enabled TracingEnabled: true on API Gateway stage

Result

End-to-end tracing from API Gateway through Lambda with service maps and per-request trace details available in X-Ray console. Application code already logs x-amzn-trace-id headers, no further instrumentation needed.

# Lambda function
TracingConfig:
  Mode: Active

# IAM role
ManagedPolicyArns:
  - arn:aws:iam::aws:policy/AWSXRayDaemonWriteAccess

# API Gateway stage
TracingEnabled: true

Original prompt

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This section details on the original issue you should resolve

<issue_title>X-Rayの有効化 (cfn-service.yml)</issue_title>
<issue_description>- Active traceを有効化したい。
</issue_description>

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

• Fixes X-Rayの有効化 (cfn-service.yml) #18

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