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/r978_compound_deref_div_unsigned/case.ww

@@ -0,0 +1,10 @@
+//ww:run-exit 42
+package main;
+fn main() i32 = {
+	let arr: [1]u64;
+	arr[0] = 0x8000000000000001u64;
+	let p: *u64 = &arr[0];
+	*p /= 2u64;
+	if (arr[0] == 0x4000000000000000u64) { return 42; };
+	return 0;
+};