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Rewrite psb_d_nest_cg_test to build the operator through the psb_d_nest_matrix utility (init/ins/asb + get_owned_rows) instead of the low-level path, so no per-field descriptor or l2g idiom appears in user-facing test code; x_exact=1 is set with x%set(done) rather than an l2g loop. With this change psb_d_nest_cg_test fully subsumes psb_d_nest_builder_test (same operator via the same builder, NONE plus DIAG/BJAC), so the latter is removed. The test suite is now glob (square matvec), rect (rectangular matvec) and cg (builder + preconditioned CG). Build hooks and README updated. Author: Simone Staccone (Stack-1)