[WIP] Add summary method for BayesMallowsSMC2 objects

[Copilot]

Plan for Summary Method Implementation

• Create a summary.BayesMallowsSMC2 function in R/print.R
  • Include all information from print method (particles, timepoints, items, clusters, log marginal likelihood, ESS, resampling events)
  • Add posterior mean of alpha across particles
  • Add posterior standard deviation of alpha across particles
  • Return summary object (S3 class)
• Create print method for the summary object
• Update NAMESPACE to export summary method
• Add tests for the summary method in tests/testthat/test-print.R
• Build and test the package

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create summary method</issue_title>
<issue_description></issue_description>

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

@osorensen Create a summary method for objects of S3 class BayesMallowsSMC2. I think it could be very similar to the print method, but perhaps also contain some information about the posterior mean and standard deviation of alpha?

• Fixes Create summary method #22

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