phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

examples/jit_copy_const_cast.hako

@@ -0,0 +1,19 @@
+// Copy/Const/Cast coverage demo
+// Use with: NYASH_JIT_THRESHOLD=1 NYASH_JIT_DUMP=1
+
+static box Main {
+  main() {
+    local a, b, f
+    a = 42
+    b = a // Copy
+    f = 100.0
+    // Mixed compare (int vs float) to exercise promote/cast path in optimizer
+    if (b < f) {
+      // Return boolean directly
+      return b < f
+    } else {
+      return false
+    }
+  }
+}
+