Enums whose variants hold values

enum Shape { Circle(float), Rect(float, float), Point }; Shape.Circle(2.0) makes one, match names the values
(Circle(r), _ to ignore), exhaustive like plain enums, printing shows Rect(2, 3.5). Underneath it is a struct (tag +
every variant's values), so copying, freeing, methods and valgrind-cleanliness come with it. Also: stray note files removed.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015f73FesGZGYPkmDvUcj6QX

tests/new/fail/payload_missing.fch

@@ -0,0 +1,12 @@
+// expect: this match doesn't handle Point
+enum Shape {
+    Circle(float)
+    Point
+}
+
+fn main() {
+    s := Shape.Circle(1.0)
+    match s {
+        Circle(r) -> print(r)
+    }
+}