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/r940_str_forrange_expr/case.ww

@@ -0,0 +1,13 @@
+//ww:run
+// Lifted from test/wcc/940_str_forrange_loopvar_run.c
+// siteb_expr_readback: a str for-range binding is u8 in arithmetic.
+package main;
+export fn main() i32 = {
+	let s: str = "AB";
+	let sum: i32 = 0;
+	for (let b .. s) {
+		sum += b: i32;
+	};
+	if (sum != 131) { return 1; };
+	return 0;
+};