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/r806_tryprop_accept_void_success/case.ww

@@ -0,0 +1,12 @@
+//ww:run
+package main;
+fn f(k: i32) (void | nomem) = { return; };
+fn g() (i32 | nomem) = { f(1)?; return 5; };
+export fn main() i32 = {
+	let x: (i32 | nomem) = g();
+	match (x) {
+	case let v: i32 => return v - 5;
+	case nomem => return 2;
+	};
+	return 3;
+};