fix(sdk/watchdog): 236 收尾 — sigusr1_guard 无日志目录时落 stderr 可观测; test_wd_fw 补 fw-app/裸沉浸/裸非沉浸三用例; hello/files/ncm 随 meow_ui.a(4020227c) 重链 (已热更到卡, watchdog 6373d8e5 待入 M2.89)

patch_v2/meow_launcherd/test_host_icon.c

@@ -92,6 +92,7 @@ int main(void)
     setbuf(stdout, NULL);   /* 立即冲刷，abort 前也能看到 printf */
     setenv("MEOW_UI_DUMP", "/tmp/icon.ppm", 1);
     meow_ui_opts o = { FB_W, FB_H };
+    (void)o;
     assert(meow_ui_init(&o) == 0);
     assert(meow_ui_width() == FB_W && meow_ui_height() == FB_H);