search.c changes to restore (both trivial one-liners):

1. Near `iInitialAlpha = iAlpha;` (right after it), add:

    pi->fPvNode = (iBeta != iAlpha + 1);

2. OPTIONAL -- only if resuming "isolate LMR's effect alone" testing
   methodology (i.e. you want LMR-only numbers uncontaminated by
   futility pruning again). If instead you want to test LMR *combined*
   with futility (recommended next step per yesterday's session), skip
   this and leave futility on as it is in the clean baseline.

   Find the futility-pruning block:

       ASSERT(!uFutilityMargin);
       if ((iRoughEval + VALUE_ROOK <= iAlpha) &&
           (uDepth <= TWO_PLY) &&
           ...

   and disable it for isolation testing:

       ASSERT(!uFutilityMargin);
       if (FALSE && // temporarily disabled to isolate graded-LMR's
                    // effect in isolation during testing
           (iRoughEval + VALUE_ROOK <= iAlpha) &&
           (uDepth <= TWO_PLY) &&
           ...

Everything else in search.c (the GetLMRReduction call site, the
re-search-add-back using `uNextDepth -= iExtend`) is already generic
and needs NO changes -- it was written to work with any reduction
magnitude GetLMRReduction returns, so it already works correctly with
both the baseline's fixed -ONE_PLY and the graded version.