WIP: Rename model-config.ts to models-json.ts

- loadCustomModels now takes file path instead of agentDir

packages/coding-agent/src/core/sdk.ts

@@ -45,7 +45,7 @@ import {
 	getApiKeyForModel,
 	getAvailableModels,
 	loadAndMergeModels,
-} from "./model-config.js";
+} from "./models-json.js";
 import { SessionManager } from "./session-manager.js";
 import { type Settings, SettingsManager, type SkillsSettings } from "./settings-manager.js";
 import { loadSkills as loadSkillsInternal, type Skill } from "./skills.js";