docs: add comprehensive xdebug documentation - Home: Overview and table of contents - Understanding-Xdebug: Architecture and installation - DBGp-Protocol: Complete protocol documentation - Debugging-Guide: Step-by-step debugging workflow - MCP-Server-Architecture: System design and data flows - Connection-Modes: TCP vs Unix sockets comparison - Tools-Commands: Complete tool reference Total: 2,325 lines of detailed documentation

kpanuragh committed Mar 23, 2026