Confirm docs-only changes no longer trigger a production deploy

.github/workflows/deploy.yml

@@ -3,6 +3,17 @@ name: Deploy to production
 on:
   push:
     branches: [master]
+    paths:
+      # Everything the two Dockerfiles actually COPY into their images.
+      - apps/ai-service/**
+      - apps/web/**
+      - packages/**
+      - ingestion/data/verified/drug_entities.json
+      # docker-compose.prod.yml, docker-compose.observability.yml,
+      # Caddyfile, and the grafana/otel/prometheus/tempo configs it mounts.
+      - infra/docker/**
+      # Changes to the deploy logic itself should still be exercised.
+      - .github/workflows/deploy.yml
   workflow_dispatch:
 
 jobs: