Support multiple AI providers (OpenAI, Minimax, OpenAI-compatible APIs)

[aliciapaz]

Problem

The gem is hardcoded to OpenAI's SDK and Responses API, making it impossible to use with other AI providers like Minimax, Ollama, or any OpenAI-compatible API.

Specifically:

1. config.js — imports openai and creates a client with OPENAI_API_KEY only
2. ai.js — calls client.responses.create(), which is OpenAI's Responses API (not the standard Chat Completions API that compatible providers implement)
3. package.json — only includes the openai dependency
4. README.md and install_generator.rb — reference OpenAI exclusively

Desired Behavior

Users should be able to configure any OpenAI-compatible provider by setting environment variables:

Variable	Default	Description
AI_API_KEY	(required)	API key for the AI provider
AI_MODEL	gpt-4o	Model to use
AI_BASE_URL	https://api.openai.com/v1	Base URL for the API (change for Minimax, Ollama, etc.)

This way users can point the agent at any provider that implements the OpenAI Chat Completions API:

• OpenAI: default, no extra config needed
• Minimax: set AI_BASE_URL=https://api.minimax.chat/v1 and AI_API_KEY
• Ollama: set AI_BASE_URL=http://localhost:11434/v1 and any AI_API_KEY
• Azure OpenAI, Together AI, Groq, etc.

Required Changes

1. Switch from client.responses.create() (Responses API) to client.chat.completions.create() (Chat Completions API) — this is the universal standard
2. Make the API key env var provider-agnostic (AI_API_KEY, with OPENAI_API_KEY as fallback)
3. Add AI_BASE_URL config to point at any compatible endpoint
4. Update README and generator instructions