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/r845_tuple_one_comma/case.ww

@@ -0,0 +1,7 @@
+//ww:error c "unexpected token in expression" ww "expected expression"
+package main;
+
+fn main() i32 = {
+	let t = (5,);
+	return 0;
+};