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_chain_call/case.ww

@@ -0,0 +1,13 @@
+//ww:run-exit 41
+package main;
+type inner = struct { a: i64, b: i64 };
+type middle = struct { in: inner, t: i64 };
+type outer = struct { m: middle, x: i64 };
+fn mki() inner = { return inner { a = 5i64, b = 6i64 }; };
+fn main() i32 = {
+	let o: outer;
+	o.m.t = 10i64;
+	o.x = 20i64;
+	o.m.in = mki();
+	return (o.m.in.a + o.m.in.b + o.m.t + o.x): i32;
+};