Clear unavailable gravity measurements before each attempt

libmeanfield/interface/solver/newton_numerics.cppm

@@ -81,9 +81,17 @@ export namespace mean_field::solver::nonlinear {
         std::uint64_t gravityPreparedFailures{0};
         bool compactGravityOperator{false};
         bool compactGravityInverse{false};
+        // Coordinates of the evaluation's lastLinearSolve report. A later
+        // feasibility relift or trial solve has its own auxiliary diagnostics
+        // and does not replace that report or relabel its stored norms.
         LinearReportSpace lastLinearReportSpace{LinearReportSpace::full_system};
         double gravitySolveSeconds{0.0};
+        // Last completed auxiliary solve; a later failure before Solve leaves
+        // this value and the cumulative counters unchanged.
         double lastGravityTrueResidual{0.0};
+        // Current gravity attempt: NaN until that attempt measures the value.
+        // Candidates rejected before invoking gravity leave its prior attempt
+        // untouched because no auxiliary work was attempted.
         double lastGravityCorrectionNorm{0.0};
         double lastGravityPreparedDefect{0.0};
         double lastGravityAffineDisagreement{0.0};