Summary

Adds x.ai (Grok) as a new LLM provider for Archestra.

Fixes #1850

/claim #1850

Changes

Backend

• Config: Added llm.xai and chat.xai configuration entries with default base URL https://api.x.ai/v1
• Types: Created types/llm-providers/xai/ with OpenAI-compatible type definitions (x.ai uses OpenAI-compatible API)
• Adapter: Implemented xaiAdapterFactory wrapping OpenAI adapter with x.ai-specific configuration
• Routes: Added V2 route handlers for x.ai chat completions (default and agent-specific)

Shared

• Added xai to SupportedProvidersSchema
• Added xai:chatCompletions to SupportedProvidersDiscriminatorSchema
• Added RouteIds: XaiChatCompletionsWithDefaultAgent, XaiChatCompletionsWithAgent
• Added display name: x.ai (Grok)

Frontend

• Implemented XaiChatCompletionInteraction handler (mirrors OpenAI since x.ai is OpenAI-compatible)
• Registered in interaction.utils.ts

API Key Instructions

1. Create an account at x.ai Console
2. Navigate to API Keys section
3. Generate a new API key
4. Set ARCHESTRA_CHAT_XAI_API_KEY environment variable

Supported Models

• grok-4
• grok-4-1-fast-reasoning
• grok-4-1-fast-non-reasoning
• grok-code-fast-1

Verification

• Non-streaming responses work correctly
• Streaming responses work correctly