only verify integer type for parent index

src/config_loader.cpp

@@ -55,9 +55,8 @@ static bool parse_toml_body(toml_datum_t body_table, CelestialBody* body) {
     toml_datum_t eccentricity = toml_get(body_table, "eccentricity");
     toml_datum_t semi_major = toml_get(body_table, "semi_major_axis");
 
-    // Accept both INT64 and FP64 for parent_index (TOML may parse integers as floats)
     if (mass.type != TOML_FP64 || radius.type != TOML_FP64 ||
-        (parent_idx.type != TOML_INT64 && parent_idx.type != TOML_FP64) ||
+        parent_idx.type != TOML_INT64 ||
         eccentricity.type != TOML_FP64 ||
         semi_major.type != TOML_FP64) {
         return false;