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/r835_union_subset_cast_reject/case.ww

@@ -0,0 +1,9 @@
+//ww:error "tagged cast source shape unwired"
+package main;
+type inner = (int | bool); type outer = (int | bool | str);
+fn mk() outer = { return true: inner; };
+export fn main() i32 = {
+	let v = mk();
+	match (v) { case let n: int => return 70; case let b: bool => return 11; case let s: str => return 22; };
+	return 99;
+};