test: migrate 24 residual carriers into the fixture corpus

Audit-driven migrate-and-retire wave (one read-only auditor per
carrier batch, verdicts row-checked through the full corpus gate):
every retired carrier's assertions are now owned by declarative
fixtures or an existing owner. 238 new fixtures land (corpus 1,239 ->
1,477; cells 2,954), covering enum/str/slice/tagged array elements,
inferred-length arrays, global slice/str zero-init and literals,
global array/pointer field reads and stores, struct-literal slice
fields, struct returns, float arithmetic, size/int limits, sort and
log-vstream behavior, place-addressed stores, and append places.
Rejection rows STRENGTHEN the old nonzero-exit checks to required
diagnostic fragments; all byte-id claims fold into the blanket
test-data-byteid sweep (now 1,142 compared, 0 pinned-divergent).
Four carriers were fully redundant with existing fixtures/lang tests
(749, 722, 765, and 771's byteid rows) and retire without new rows.
Native carriers 171 -> 147 (residual 135 -> 111).

test/wcc/data/r806ap_deref_spine/case.ww

@@ -0,0 +1,19 @@
+//ww:run-exit 71
+package main;
+type holder = struct { tag: i64, xs: []i64 };
+fn addspine(q: *[]holder, i: i64, v: i64) void = {
+	append((*q)[i].xs, v);
+};
+export fn main() i32 = {
+	let hs: []holder = [];
+	let h0: holder = holder { tag = 1, xs = [] };
+	append(hs, h0);
+	addspine(&hs, 0, 41);
+	addspine(&hs, 0, 43);
+	let hp: *holder = &hs[0];
+	let g: []i64 = hp.xs;
+	if (len(g) != 2) { return 1; };
+	if (g[0] != 41 || g[1] != 43) { return 2; };
+	if (hp.tag != 1) { return 3; };
+	return 71;
+};