Sign-in by customer: realm petrolyst, row rules, guest role (PD-21)

Keycloak import for realm petrolyst: two clients, petrolyst with MFA for
Superset and Traefik, petrolyst-app password only. It lists only
app.petrolyst.com and traefik.petrolyst.com, and no customer names, as this
repository is public. public.v_operator shows each customer's group. Dashboards
overview and site, role Petrolyst Guest, filtered by row. Superset refuses a
user with no mapped role. The realm travels with the release: each release's
compose files name their realm and secret file, and a rollback needs only its
target's secret. Not deployed.

Checks earlier on this content: tests/run.sh 109 of 109 and read-only, dashboards
import twice, column drift 0, compose config on old and new trees, the secret
check on a scratch folder, a rehearsal on a throwaway Keycloak 26.4. Never a real
deploy or rollback; shellcheck not installed today, clean when last run. Codex
inspected once; its fixes are not re-inspected, on the owner's word.

Bands: persistence, Superset. Rules: 1, 2, 3, 6, 14.

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

petrolyst-insights/dashboards/README.md

@@ -4,7 +4,7 @@ Superset dashboards as code and the operator scripts that import them. Not baked
 image, so changes here do not rebuild or restart Superset.
 
 - `atoma/`: ATOMA's two dashboards for the Petrolyst app (PD-12, PD-13; SPEC.md §10):
-  `atoma-overview` (fleet totals) and `atoma-site` (one site, its four sections as tabs). The
+  `overview` (fleet totals) and `site` (one site, its four sections as tabs), named `atoma-overview` and `atoma-site` until 30 Oct. The
   app embeds them; admins open them in Superset, with the filter column. `SPEC.md` is the
   design; `build_bundle.py` generates the import bundle and `import_bundle.py` imports it
   (overwriting the objects the bundle defines).