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_ampfncollide_silent/case.ww

@@ -0,0 +1,12 @@
+//ww:error "not assignable"
+// A foreign-signature slot must not capture the current module's fn by leaf.
+package beta;
+export type gfn = fn(s: str) str;
+export fn handler(x: i32) i32 = { return x + 41; };
+export fn usebeta() i32 = { let p: *gfn = &handler; if (p == p) { return 1; }; return 0; };
+package gamma;
+export fn handler(s: str) str = { return s; };
+package main;
+import beta;
+import gamma;
+fn main() int = { return beta.usebeta(): int; };