Implement Phase 0: Stabilize CLI build with feature separation

Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>

local_tests/basic_math.nyash

@@ -0,0 +1,13 @@
+// Basic arithmetic test
+local a, b, c, d, flag
+a = 10
+b = 20
+c = a + b
+print("10 + 20 = " + c)
+
+d = c * 2
+print("30 * 2 = " + d)
+
+// Boolean test
+flag = true
+print("Flag is: " + flag)