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/r929_memarg_reject_variadic/case.ww

@@ -0,0 +1,12 @@
+//ww:error ">48B tagged variadic element unwired"
+package main;
+type t_lit = rune;
+type t_any = void;
+type t_rep = struct { id: size, origin: size, m0: size, m1: size, m2: size, m3: size };
+type t_u = (t_lit | t_any | t_rep);
+fn v(xs: t_u...) i32 = { return len(xs): i32; };
+export fn main() i32 = {
+	let a: t_u = ('x': t_lit);
+	if (v(a) != 1) { return 1; };
+	return 0;
+};