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/r71_arrlit_str_repeat/case.ww

@@ -0,0 +1,12 @@
+//ww:run-exit 5
+package main;
+fn main() i32 = {
+	let a: [5]str = ["x"...];
+	let s: i32 = 0i32;
+	let i: i32 = 0;
+	for (i < 5) {
+		s += a[i].len: i32;
+		i += 1;
+	};
+	return s;
+};