OpenTelemetry Enhancements

• Configurable Timeout: New environment variable CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS allows customizing the OpenTelemetry shutdown timeout (default: 1000ms)
• Better Error Messages: When metrics flush times out, users receive helpful guidance:

  OpenTelemetry metrics flush timed out after [X]ms
  
  To resolve this issue, you can:
  1. Increase the timeout by setting CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS env var
  2. Check if your OpenTelemetry backend is experiencing scalability issues
  3. Disable OpenTelemetry by unsetting CLAUDE_CODE_ENABLE_TELEMETRY env var