fix: use residual stopping for FEAST eigenanalysis

src/fesa/io/hdf5/eigen_hdf5_results_writer.cpp

@@ -137,7 +137,7 @@ Status Validate(const Domain& domain, const EigenAnalysisState& state,
                                                              {2U, 12},
                                                              {3U, 20},
                                                              {4U, 1},
-                                                             {5U, 1},
+                                                             {5U, 0},
                                                              {13U, 0},
                                                              {26U, 1},
                                                              {27U, 1},

src/fesa/solvers/eigen/mkl_feast_eigen_solver.cpp

@@ -174,7 +174,7 @@ void SetControls(std::array<MKL_INT, 128>& fpm, const bool count) {
   fpm[2] = 12;
   fpm[3] = 20;
   fpm[4] = 1;
-  fpm[5] = 1;
+  fpm[5] = 0;  // Trace convergence alone can leave individual pairs inaccurate.
   fpm[13] = 0;
   fpm[26] = 1;
   fpm[27] = 1;