Discovered that Xcode's claudeai-mcp feature gate blocks custom MCP
servers from the global .claude config. Project-level .mcp.json files
bypass this gate entirely — this is now the documented method.
- Add scripts/xcode-setup.sh: auto-installs vestige-mcp and configures
.mcp.json for any Xcode project with checksum verification
- Rewrite docs/integrations/xcode.md with .mcp.json method, gate bypass
docs, and new troubleshooting for "Agent has been closed" error
- Add docs/blog/xcode-memory.md: launch blog post for Vestige on Xcode
