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/r84_qualstruct_nested/case.ww

@@ -0,0 +1,15 @@
+//ww:run-exit 18
+package pkg;
+export type point = struct { x: i64, y: i64 };
+export type rect = struct { lo: point, hi: point };
+package main;
+import pkg;
+export fn main() i32 = {
+	let r: pkg.rect = pkg.rect {
+		lo = pkg.point { x = 1i64, y = 2i64 },
+		hi = pkg.point { x = 7i64, y = 5i64 }
+	};
+	if (r.lo.x != 1i64) { return 1; };
+	if (r.hi.y != 5i64) { return 2; };
+	return ((r.hi.x - r.lo.x) * (r.hi.y - r.lo.y)): i32;
+};