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/r808_arrlit_exact_module/case.ww

@@ -0,0 +1,4 @@
+//ww:run
+package main;
+let g: [2]int = [4, 5];
+export fn main() i32 = { return g[1]: i32 - 5; };