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/r811_annotated_pin/case.ww

@@ -0,0 +1,4 @@
+//ww:run-exit 3
+package main;
+type rep = struct { id: size, min: (void | size) };
+export fn main() i32 = { let r: rep = rep { id = 0: size, min = void }; r.id = 1; r.min = 2: size; let acc = 0: size; acc += r.id; if (r.min is size) { acc += r.min as size; }; return acc: i32; };