• Add xAI Grok 4.1 API support (--model grok-4.1 / alias grok), defaults to https://api.x.ai/v1, uses XAI_API_KEY, and maps search to web_search with docs + live smoke.
• Per-model search tool selection so Grok uses web_search while OpenAI models stay on web_search_preview; multi-model orchestrator now includes Grok coverage.
• PTY-driven CLI/TUI harness landed for end-to-end coverage; enable via ORACLE_ENABLE_PTY_TESTS=1 with stub tokenizers to keep runs lightweight.
• MCP (global installs): keep the stdio transport alive until the client closes it so oracle-mcp no longer exits immediately after connect().