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/r776_dynamic_write_grow/case.ww

@@ -0,0 +1,18 @@
+//ww:run-exit 43
+// Migrated from 776_memio_vstream_run row dynamic_write_grow.
+package main;
+import memio;
+import io;
+import os;
+export fn main() i32 = {
+    let st: memio.stream = memio.dynamic();
+    let s: io.stream = &st.vt;
+    let src: [3]u8;
+    src[0] = 88u8; src[1] = 89u8; src[2] = 90u8;
+    let wr = io.write(s, src[0:3]);
+    let n: size = 0;
+    if (wr is size) { n = wr as size; };
+    let cl = io.close(s);
+    if (cl is void && n == 3: size) { return 43; };
+    return 99;
+};