Squeamish about New()'s empty-domain-string sentinel for "dev mode, skip OIDC discovery" - split into New (always makes a real OIDC discovery call, all params required) and NewDev (no ctx/domain/credentials at all, since none are used). main.go now branches on cfg.DevAuthEnabled to pick the right constructor instead of main.go/config.go coordinating on when it's safe to pass empty strings. Also finishes out the dev-auth flow this enables: config.Load reads a DEV_AUTH_ENABLED-aware env file and only requires Auth0 vars when dev auth is off; a PORT config var replaces the hardcoded :8082; and the nav UI (layout/index templates, ui router) points login/logout links at /api/auth/dev-login and a new /api/auth/dev-logout route when dev auth is enabled, so the whole login/logout loop works locally without a real Auth0 app. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>