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/r701_field_local_lit/case.ww

@@ -0,0 +1,9 @@
+//ww:run-exit 38
+package main;
+type inner = struct { a: i64, b: i64 };
+type outer = struct { i: inner, t: i64 };
+fn main() i32 = {
+	let o: outer = outer { i = inner { a = 0i64, b = 0i64 }, t = 5i64 };
+	o.i = inner { a = 11i64, b = 22i64 };
+	return (o.i.a + o.i.b + o.t): i32;
+};