convert
public static String convert(String modelName, String boneName, JsonObject javaModel, Map<String, SpriteInfo> spriteMap, int atlasWidth, int atlasHeight, File bedrockPackDir)
Converts a bone model and writes the .geo.json file. FMM-style wrapper: builds the FMM-prefixed geometry identifier and FMM-style output path, then delegates to convertWithIdentifier.
Return
geometry ID (e.g., "geometry.freeminecraftmodels.01_em_wolf.bodyback"), or null on failure