fix: have user run bridge in separate terminal for QR code scanning

chore: swap lharries/whatsapp-mcp for verygoodplugins/whatsapp-mcp

fix: use direct DB registration instead of IPC, simplify bridge setup

feat: add group registration flow to SKILL.md

feat: use community lharries/whatsapp-mcp instead of custom Baileys code

feat: convert to MCP-native skill architecture

feat: initial WhatsApp skill extraction from NanoClaw