refactor: add ModelRegistry.getApiKeyForProvider() for cleaner abstraction

packages/coding-agent/src/core/model-registry.ts

@@ -375,6 +375,13 @@ export class ModelRegistry {
 		return this.authStorage.getApiKey(model.provider);
 	}
 
+	/**
+	 * Get API key for a provider.
+	 */
+	async getApiKeyForProvider(provider: string): Promise<string | undefined> {
+		return this.authStorage.getApiKey(provider);
+	}
+
 	/**
 	 * Check if a model is using OAuth credentials (subscription).
 	 */

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

@@ -635,7 +635,7 @@ export async function createAgentSession(options: CreateAgentSessionOptions = {}
 			if (!resolvedProvider) {
 				throw new Error("No model selected");
 			}
-			const key = await modelRegistry.authStorage.getApiKey(resolvedProvider);
+			const key = await modelRegistry.getApiKeyForProvider(resolvedProvider);
 			if (!key) {
 				throw new Error(`No API key found for provider "${resolvedProvider}"`);
 			}