test: migrate 700_e2e rows to corpus fixtures; retire the carrier

136 rows migrated, 0 already owned, 3 wwstage-failing rows held out.

test/wcc/data/r806ap_call_src_gp16/case.ww

@@ -0,0 +1,14 @@
+//ww:run-exit 0
+// Graduated #34 reject pin: size+i64 16B GP call element (was the
+// reject fixture).
+package main;
+type box = struct { pc: size, a: i64 };
+fn mk() box = { return box { pc = 1, a = 2 }; };
+export fn main() i32 = {
+	let bs: []box = [];
+	append(bs, mk());
+	if (bs.len != 1) { return 1; };
+	if (bs[0].pc != 1) { return 2; };
+	if (bs[0].a != 2i64) { return 3; };
+	return 0;
+};