[Feature request] Add open code and antigravity

[tuanlevi95]

these two free and cheap, please add this to make can be use. Thanks

[mrbeandev]

Update: this is now implemented and tested in PR #343.

PR link: #343

It includes Google Antigravity provider support plus follow-up fixes found during real-world Telegram/Coolify testing (tool-call normalization, history ordering sanitization, and thought_signature preservation).

[nikolasdehor]

PR #343 that implemented this was closed without merge. The Antigravity provider support (Google's code execution sandbox) would need a fresh implementation.

For the "open code" part (open-source model support), this is effectively addressed by the provider refactor PRs (#213, #492) which allow connecting to any OpenAI-compatible endpoint including local models via Ollama, LM Studio, vLLM, etc.

For Antigravity specifically, the main challenge is handling Google's native API format (including thought_signature fields, see #79). The OpenAI-compatible endpoint workaround bypasses this but may not support all Antigravity-specific features like code execution sandboxing.