Claude Code v2.1.206 adds /cd suggestions, /doctor checks, and fixes login and MCP bugs

Claude Code v2.1.206 introduces new slash commands and improves session management while fixing several critical bugs related to authentication and model configuration.

• Added directory path suggestions to /cd, matching /add-dir behavior.
• Added a /doctor check that proposes trimming checked-in CLAUDE.md files by cutting content Claude could derive from the codebase.
• Gateway: /login now supports Anthropic-operated public gateway endpoints.
• Fixed an expired login failing every model with a misleading error instead of prompting to run /login.
• Fixed MCP servers configured via --mcp-config ignoring per-server request_timeout_ms, causing long-running tool calls to time out.
• Improved /code-review findings quality on claude-opus-4-8 across all effort levels.

These updates enhance workflow efficiency through better directory navigation and codebase analysis tools, while ensuring more reliable authentication and model selection processes.