feat: add Math library with abs, ceil, floor, trig, and xorshift RNG

Implement a new optional Math module for the Wren standard library, gated behind the WREN_USE_LIB_MATH flag (default on). The module provides double-precision math functions (abs, ceil, floor, int, frac, sin, cos, tan, deg, rad) and a xorshift-based pseudo-random number generator with srand/rand methods. Includes comprehensive test files for each function and an all_tests runner.

test/math/abs.wren

@@ -0,0 +1,8 @@
+IO.print(Math.abs(123))   // expect: 123
+IO.print(Math.abs(-123))  // expect: 123
+IO.print(Math.abs(0))     // expect: 0
+IO.print(Math.abs(-0))    // expect: 0
+IO.print(Math.abs(-0.12)) // expect: 0.12
+IO.print(Math.abs(12.34)) // expect: 12.34
+IO.print(Math.abs(1.0))   // expect: 1
+IO.print(Math.abs(-1.0))  // expect: 1

test/math/all_tests.wren

@@ -0,0 +1,40 @@
+IO.print("abs")
+IO.print(Math.abs(123))      // expect: 123
+IO.print(Math.abs(-123))   // expect: 123
+IO.print(Math.abs(0))        // expect: 0
+IO.print(Math.abs(-0))     // expect: 0
+IO.print(Math.abs(-0.12))  // expect: 0.12
+IO.print(Math.abs(12.34))    // expect: 12.34
+
+IO.print(Math.abs(1.0)) // expect: 1
+IO.print(Math.abs(-1.0)) // expect: 1
+
+IO.print("ceil")
+IO.print(Math.ceil(2.3)) // expect: 3
+IO.print(Math.ceil(3.8)) // expect: 4
+IO.print(Math.ceil(-2.3)) // expect: -2
+IO.print(Math.ceil(-3.8)) // expect: -3
+
+IO.print("floor")
+IO.print(Math.floor(2.3)) // expect: 2
+IO.print(Math.floor(3.8)) // expect: 3
+IO.print(Math.floor(-2.3)) // expect: -3
+IO.print(Math.floor(-3.8)) // expect: -4
+
+IO.print("int")
+IO.print(Math.int(8)) // expect: 8
+IO.print(Math.int(12.34)) // expect: 12
+IO.print(Math.int(-8)) // expect: -8
+IO.print(Math.int(-12.34)) // expect: -12
+
+IO.print("frac")
+IO.print(Math.frac(8)) // expect: 0
+IO.print(Math.frac(12.34)) // expect: 0.34
+IO.print(Math.frac(-8)) // expect: -0
+IO.print(Math.frac(-12.34)) // expect: -0.34
+
+IO.print("srand/rand")
+Math.srand
+for (i in 1..10) {
+  IO.print(Math.floor(Math.rand * 100))
+}

test/math/ceil.wren

@@ -0,0 +1,4 @@
+IO.print(Math.ceil(2.3))  // expect: 3
+IO.print(Math.ceil(3.8))  // expect: 4
+IO.print(Math.ceil(-2.3)) // expect: -2
+IO.print(Math.ceil(-3.8)) // expect: -3

test/math/floor.wren

@@ -0,0 +1,4 @@
+IO.print(Math.floor(2.3))  // expect: 2
+IO.print(Math.floor(3.8))  // expect: 3
+IO.print(Math.floor(-2.3)) // expect: -3
+IO.print(Math.floor(-3.8)) // expect: -4

test/math/frac.wren

@@ -0,0 +1,4 @@
+IO.print(Math.frac(8))      // expect: 0
+IO.print(Math.frac(12.34))  // expect: 0.34
+IO.print(Math.frac(-8))     // expect: -0
+IO.print(Math.frac(-12.34)) // expect: -0.34

test/math/int.wren

@@ -0,0 +1,4 @@
+IO.print(Math.int(8))      // expect: 8
+IO.print(Math.int(12.34))  // expect: 12
+IO.print(Math.int(-8))     // expect: -8
+IO.print(Math.int(-12.34)) // expect: -12

test/math/rand.wren

@@ -0,0 +1,4 @@
+Math.srand
+for (i in 1..10) {
+  IO.print(Math.floor(Math.rand * 100))
+}