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/r704_dot_chain_ptr/case.ww

@@ -0,0 +1,4 @@
+//ww:run-exit 27
+package main;
+type inner = struct { a: i64, b: i64 }; type outer = struct { i: inner, t: i64 }; type holder = struct { f: outer }; type h2 = struct { mid: holder, pad: i64 };
+fn main() i32 = { let h: h2; let p: *h2 = &h; p.mid.f = outer { i = inner { a = 6i64, b = 7i64 }, t = 14i64 }; return (p.mid.f.i.a + p.mid.f.i.b + p.mid.f.t): i32; };