remove gemini cli and antigravity support

packages/coding-agent/docs/custom-provider.md

@@ -199,7 +199,6 @@ The `api` field determines which streaming implementation is used:
 | `openai-codex-responses` | OpenAI Codex Responses API |
 | `mistral-conversations` | Mistral SDK Conversations/Chat streaming |
 | `google-generative-ai` | Google Generative AI API |
-| `google-gemini-cli` | Google Cloud Code Assist API |
 | `google-vertex` | Google Vertex AI API |
 | `bedrock-converse-stream` | Amazon Bedrock Converse API |
 

packages/coding-agent/docs/providers.md

@@ -18,8 +18,6 @@ Use `/login` in interactive mode, then select a provider:
 - Claude Pro/Max
 - ChatGPT Plus/Pro (Codex)
 - GitHub Copilot
-- Google Gemini CLI
-- Google Antigravity
 
 Use `/logout` to clear credentials. Tokens are stored in `~/.pi/agent/auth.json` and auto-refresh when expired.
 
@@ -30,8 +28,6 @@ Use `/logout` to clear credentials. Tokens are stored in `~/.pi/agent/auth.json`
 
 ### Google Providers
 
-- **Gemini CLI**: Standard Gemini models via Cloud Code Assist
-- **Antigravity**: Sandbox with Gemini 3, Claude, and GPT-OSS models
 - Both free with any Google account, subject to rate limits
 - For paid Cloud Code Assist: set `GOOGLE_CLOUD_PROJECT` env var
 

packages/coding-agent/docs/quickstart.md

@@ -29,7 +29,7 @@ Start pi and run:
 /login
 ```
 
-Then select a provider. Built-in subscription logins include Claude Pro/Max, ChatGPT Plus/Pro (Codex), GitHub Copilot, Google Gemini CLI, and Google Antigravity.
+Then select a provider. Built-in subscription logins include Claude Pro/Max, ChatGPT Plus/Pro (Codex), and GitHub Copilot.
 
 ### Option 2: API key