WEST PALM BEACH, Fla. — Tom Seaver, the Hall of Fame pitcher and greatest Met of all time, has been diagnosed with dementia and retired from public life, his family announced Thursday. The news comes as the Mets approach the 50th anniversary of the 1969 championship team that Seaver, nicknamed “Tom Terrific,” pitched to a World Series win. Seaver’s family said in a statement released by the Hall of Fame that the 74-year-old will continue to work in his beloved vineyard in California, but will no longer make public appearances. Seaver has been dealing with cognitive issues for years, but...