Fix Windows test failures: backslash allowed, skip shell-dependent test

tests/test_cli.c

@@ -346,6 +346,9 @@ TEST(cli_find_cli_on_path) {
 }
 
 TEST(cli_find_cli_fallback_paths) {
+#ifdef _WIN32
+    SKIP("shell scripts + chmod not available on Windows");
+#endif
     /* Port of TestFindCLI_FallbackPaths */
     char tmpdir[256]; snprintf(tmpdir, sizeof(tmpdir), "/tmp/cli-find-XXXXXX");
     if (!cbm_mkdtemp(tmpdir))

tests/test_security.c

@@ -50,7 +50,12 @@ TEST(shell_rejects_ampersand) {
 }
 
 TEST(shell_rejects_backslash) {
+#ifdef _WIN32
+    /* Backslash is allowed on Windows (path separator) */
+    ASSERT_TRUE(cbm_validate_shell_arg("foo\\bar"));
+#else
     ASSERT_FALSE(cbm_validate_shell_arg("foo\\bar"));
+#endif
     PASS();
 }