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/r72_empty_alloc_annotated_u8/case.ww

@@ -0,0 +1,9 @@
+//ww:run-exit 16
+package main;
+import rt;
+fn main() i32 = {
+	let b: []u8 = alloc([], 8u64)!;
+	b[0] = 7u8;
+	b[3] = 9u8;
+	return (b[0]: i32) + (b[3]: i32);
+};