Builds the $method_data slot of an fb4_result object.
Dispatches on method and delegates large uncertainty list
construction to dedicated helpers:
build_tmb_uncertainty,
build_individual_uncertainty,
build_population_uncertainty.
create_method_specific_data(raw_results, execution_plan, method)Named list that becomes result$method_data
Raw output list returned by the strategy
Execution plan from create_execution_plan()
Normalised method string (e.g. "mle", "bootstrap")