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/r800append_enum_alias_esz/case.ww

@@ -0,0 +1,8 @@
+//ww:run-exit 5
+package main;
+type ek = enum { A = 5, B = 9 };
+export fn main() i32 = {
+	let xs: []ek = [];
+	append(xs, ek.A);
+	return xs[0]: i32;
+};