Fix agent loop to correctly handle non-OpenAI providers (e.g., Gemini)

Author: byteakp

codex-cli/src/utils/agent/agent-loop.ts

@@ -691,8 +691,8 @@ export class AgentLoop {
               .join("\n");
 
             const responseCall =
-              !this.config.provider ||
-              this.config.provider?.toLowerCase() === "openai"
+              (!this.provider || this.provider.toLowerCase() === "openai") &&
+              (!this.config.provider || this.config.provider?.toLowerCase() === "openai")
                 ? (params: ResponseCreateParams) =>
                     this.oai.responses.create(params)
                 : (params: ResponseCreateParams) =>