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_outer_inner/case.ww

@@ -0,0 +1,11 @@
+//ww:run-exit 7
+package main;
+fn main() i32 = {
+	let a: [64]u8 = [0u8...];
+	a[0] = 7u8;
+	{
+		let a: i64 = 0i64 - 1i64;
+		if (a == 0i64) { return 99i32; };
+	};
+	return a[0]: i32;
+};