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/r56_strarg_local_chain/case.ww

@@ -0,0 +1,10 @@
+//ww:run-exit 42
+package main;
+type inner = struct { s: str, pad: i32 };
+type outer = struct { i: inner, tag: i32 };
+fn slen(s: str) i32 = { return s.len: i32; };
+fn main() i32 = {
+	let o: outer; o.i.s = "qrstuvw";
+	if (slen(o.i.s) != 7) { return 1; };
+	return 42;
+};