n8n MCP Server

# v0.3.0 - feat: end-to-end CLI smoke tests against real n8n - New script: `npm run smoke` - Auto-loads `.env` and enables source maps for readable stacks - Validates list/create/get/activate/webhook-urls/deactivate/delete (+ cleanup) - fix(cli): emit pure JSON on stdout for create/get/list/etc. to ease automation - fix(client): unwrap API responses with or without `{ data: ... }`; omit read-only `active` on create/update; ensure minimal `settings: {}` - docs: README and testing guide updated with smoke test instructions - CI: Tests and coverage green; ready for publish See CHANGELOG.md for details.