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/r829_local_str_ctrl/case.ww

@@ -0,0 +1,8 @@
+//ww:run-exit 2
+// Migrated from 829_slice_str_global_arg row ctrl_local_str.
+package main;
+fn take(x: str) int = { return x.len: int; };
+export fn main() i32 = {
+	let s: str = "ab";
+	return take(s): i32;
+};