build: finish cross-platform release tooling

tests/test_model_registry.c

@@ -8,6 +8,7 @@
 #include "cst_test_util.h"
 #include "os_compat.h"
 
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -49,7 +50,9 @@ static void test_builtin(void) {
   cst_model_info("deepseek", "deepseek-chat", &mi);
   EXPECT(mi.vision == 1, "deepseek-chat is deepseek-flash");
   cst_model_info(NULL, "gpt-4o-mini-2024", &mi);
-  EXPECT(mi.price.miss == 0.15 && mi.context == 128000 && mi.vision == 1,
+  /* x87 (i686) compares the literal at long double precision: no == here */
+  EXPECT(fabs(mi.price.miss - 0.15) < 1e-12 && mi.context == 128000 &&
+             mi.vision == 1,
          "gpt-4o-mini over gpt-4o");
   cst_model_info(NULL, "Qwen/Qwen2.5-VL-72B-Instruct", &mi);
   EXPECT(mi.vision == 1 && mi.context == 131072, "glob *-vl* + qwen prefix");