v0.2.0

Added

• ChatGPT Plus/Pro OAuth authentication: Use your ChatGPT subscription to access GPT-5.x models via the Codex backend — no API credits required
• /login command: Authenticate with providers (OpenAI, Anthropic) directly from the TUI without restarting
• In-TUI login wizard: Native multi-step login flow with OAuth and API key support, replacing the old TUI-suspend approach
• CodexBridge: Dedicated HTTP client for the ChatGPT Codex Responses API with SSE streaming, stateless conversation history, tool calls, and automatic token refresh
• Codex model catalog: Local catalog of ChatGPT-available models (gpt-5.4, gpt-5.2, gpt-5.2-codex, etc.) integrated with the /model selector
• Status bar indicator: Shows (ChatGPT) or (API) next to the model name to distinguish authentication mode
• JWT decoder: Extracts chatgpt_account_id from OAuth tokens for Codex API authentication

Changed

• OpenAI OAuth now authenticates via ChatGPT Codex backend instead of the OpenAI Platform API
• OAuth scopes expanded to openid profile email offline_access with Codex-specific auth params
• AuthManager skips OpenAI OAuth credentials for RubyLLM configuration (handled by CodexBridge)
• Default OpenAI model updated to gpt-5.4