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/r650_ptr_i8_negative/case.ww

@@ -0,0 +1,6 @@
+//ww:run-exit 42
+package main;
+type holder = struct { v: i8, pad: i8 };
+type box = struct { h: holder, tag: i32 };
+fn put(b: *box) void = { b.h.v = -7i8; };
+fn main() i32 = { let b: box; b.h.v = 0i8; b.h.pad = 0i8; b.tag = 0; put(&b); let r: i32 = b.h.v: i32; if (r == -7) { return 42; }; return 0; };