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/r944_alias_emit_slcstr_2lvl/case.ww

@@ -0,0 +1,9 @@
+//ww:error "slice-of-{str,slice,tagged} literal static-init unsupported"
+package main;
+type ms0 = str;
+type ms = ms0;
+let G: []ms = ["aa", "bbb"];
+export fn main() i32 = {
+	if (len(G[0]) != 2) { return 1; };
+	return 0;
+};