scaffold: kind+Tilt cluster, api/ui/docs stubs, green at nvi.local.ar

.env.example

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+# Copy to .env and fill in. Used by docker-compose; k8s pulls from the
+# nvi-config ConfigMap (ctrl/k8s/base/configmap.yaml).
+
+# Warehouse
+DATABASE_URL=postgresql://nvi:nvi@postgres:5432/nvi
+
+# LLM
+ANTHROPIC_API_KEY=
+ANTHROPIC_MODEL=claude-sonnet-4-6
+
+# Langfuse — set LANGFUSE_HOST to your lng WireGuard endpoint; create an
+# "nvi" project in the lng UI and paste its keys here.
+LANGFUSE_HOST=http://lng.local.ar:3000
+LANGFUSE_PUBLIC_KEY=
+LANGFUSE_SECRET_KEY=