Start the local v2 stack: 
backend-v2/scripts/local-compose.sh up -d --build
Open the docs UI at: 
http://localhost:8090
The local Compose service bind-mounts docs.json, docs-ui/ and openapi/ read-only into the Mintlify container. OpenAPI changes are therefore visible to the docs preview without copying the spec into a second source location. Validate the docs image and OpenAPI references: 
backend-v2/scripts/validate-docs-ui.sh
Change WATCHATIC_V2_DOCS_UI_PORT in backend-v2/.env.local when port 8090 is already in use.