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/r709_localoff_inner_outer/case.ww

@@ -0,0 +1,9 @@
+//ww:run-exit 99
+package main;
+fn main() i32 = {
+	let i: i32 = 0;
+	for (i < 3) { let a: i64 = 5i64; i += 1; };
+	let a: [128]u8 = [0u8...];
+	a[127] = 99u8;
+	return a[127]: i32;
+};