Prints a session summary and marks the session inactive. The store is
preserved in memory and remains queryable via lg_trace(),
lg_exclusions(), and lg_report() until
lg_start() is called again.
Examples
lg_start()
#> lineager: session started
lg_end()
#> lineager: session ended — 0 operation(s), 0 exclusion(s), 0 population(s), 0 var spec(s)
