feat(search): add search tuning parameters

SearchParams.scala

@@ -0,0 +1,45 @@
+package gambit
+
+object SearchParams:
+  val reverseFutilityDepth = 6
+  val reverseFutilityMargin = 80
+
+  val razorDepth = 3
+  val razorMargin: Array[Int] = Array(0, 240, 300, 520)
+
+  val futilityDepth = 6
+  val futilityMargin = 90
+
+  val lmpDepth = 6
+  val lmpBase: Array[Array[Int]] =
+    val out = Array.ofDim[Int](2, lmpDepth + 1)
+    var d = 0
+    while d <= lmpDepth do
+      out(0)(d) = (3 + d * d) / 2
+      out(1)(d) = 3 + d * d
+      d += 1
+    out
+
+  val lmrMinIndex = 3
+  val lmrMinDepth = 3
+  val lmrTable: Array[Array[Int]] =
+    val maxDepth = 64
+    val maxMoves = 64
+    val out = Array.ofDim[Int](maxDepth + 1, maxMoves + 1)
+    var d = 1
+    while d <= maxDepth do
+      var m = 1
+      while m <= maxMoves do
+        val r = 0.75 + math.log(d) * math.log(m) / 2.25
+        out(d)(m) = math.max(0, r.toInt)
+        m += 1
+      d += 1
+    out
+
+  def lmrReduction(depth: Int, moveIndex: Int): Int =
+    val d = math.min(depth, 64)
+    val m = math.min(moveIndex, 64)
+    lmrTable(d)(m)
+
+  val seeQuietMargin = -20
+  val deltaMargin = 120