test/wcc/data: grow the declarative compiler corpus to 1,224 fixtures

The r-prefixed waves absorb the runtime, reject, and byte-compare rows
of the migrated native carriers; each fixture is one directory with one
case.ww and a //ww:error, //ww:compile, //ww:run, or //ww:run-exit
directive covering both frontends.

test/wcc/data/r951_defdim_twoafter/case.ww

@@ -0,0 +1,10 @@
+//ww:run-exit 33
+package main;
+def M: i32 = 4;
+type t = struct { b: [M]u8, a: i32, c: i32 };
+export fn main() i32 = {
+	let s: t;
+	s.a = 11;
+	s.c = 22;
+	return s.a + s.c;
+};