core: for/foreach -> Loop normalization (always-on); LoopForm MVP-3 per-segment reorder; smokes stabilized (VM + LLVM PHI); docs updated (macro-system, loopform); quiet macro load logs

apps/tests/macro/loopform/for_basic.nyash

@@ -0,0 +1,3 @@
+for(fn(){ local i = 0 }, i < 3, fn(){ i = i + 1 }, fn(){
+  print(i)
+})

apps/tests/macro/loopform/foreach_basic.nyash

@@ -0,0 +1,4 @@
+local arr = [1,2,3]
+foreach(arr, "x", fn() {
+  print(x)
+})

apps/tests/macro/loopform/with_break.nyash

@@ -0,0 +1,9 @@
+local i = 0
+loop(i < 6) {
+  print(i)
+  if (i == 3) {
+    break
+  }
+  i = i + 1
+}
+

apps/tests/macro/loopform/with_continue.nyash

@@ -0,0 +1,11 @@
+local i = 0
+local sum = 0
+loop(i < 5) {
+  i = i + 1
+  if (i % 2 == 0) {
+    continue
+  }
+  sum = sum + i
+  print(sum)
+}
+