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/r709_localoff_defer_shadow/case.ww

@@ -0,0 +1,12 @@
+//ww:run-exit 42
+package main;
+fn touch(p: *i32) i32 = { *p = 42i32; return 0i32; };
+fn main() i32 = {
+	let a: i32 = 7;
+	defer touch(&a);
+	{
+		let a: i32 = 99;
+		if (a == 0i32) { return 1i32; };
+	};
+	return a;
+};