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/r989_nullableglobal_inline/case.ww

@@ -0,0 +1,6 @@
+//ww:error "nullable-global storage unimplemented (task #15)"
+package main;
+let gv: i64 = 7;
+let g: (*i64 | void) = &gv;
+fn ck() int = { match (g) { case let p: *i64 => return (*p): int; case void => return 9; }; };
+export fn main() int = { return ck(); };