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/r779_branched_lprintln/case.ww

@@ -0,0 +1,27 @@
+//ww:run-exit 45
+package main;
+import os;
+import log;
+import memio;
+import io;
+export fn main() i32 = {
+    let bufA: [16]u8;
+    let bufB: [16]u8;
+    let stA: memio.stream = memio.fixed(bufA[0:16]);
+    let vsA: io.stream = &stA.vt;
+    let stB: memio.stream = memio.fixed(bufB[0:16]);
+    let vsB: io.stream = &stB.vt;
+    let slA: log.stdlogger = log.new(vsA);
+    let slB: log.stdlogger = log.new(vsB);
+    let sel: i32 = 1;
+    let chosen: *log.logger = &slA.logger;
+    if (sel == 0) { chosen = &slB.logger; };
+    log.lprintln(chosen, "pick");
+    if (bufA[0] != 112u8) { return 91; };
+    if (bufA[1] != 105u8) { return 92; };
+    if (bufA[2] != 99u8)  { return 93; };
+    if (bufA[3] != 107u8) { return 94; };
+    if (bufA[4] != 10u8)  { return 95; };
+    if (bufB[0] != 0u8)   { return 96; };
+    return 45;
+};