Trial state of 29 Oct 2026: ATOMA reader setup, app dashboards, embedding notes

Baseline before the clean-up (PD-13): the PD-11 reader setup and the PD-12 app
dashboards as they ran on the local stack, uncommitted until now. Not deployed,
not independently reviewed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

keycloak/petrolyst-partial-import.json

@@ -49,6 +49,7 @@
         { "name": "superset-admin", "description": "Superset Admin at atoma.petrolyst.com" },
         { "name": "superset-editor", "description": "Superset Alpha: build charts and dashboards" },
         { "name": "superset-viewer", "description": "Superset Gamma: view dashboards shared with the role" },
+        { "name": "atoma-reader", "description": "Superset ATOMA Reader: read the ATOMA dashboard only" },
         { "name": "traefik-admin", "description": "Traefik dashboard at traefik.petrolyst.com" }
       ]
     }