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/atoma/SPEC.md

@@ -1,6 +1,7 @@
 # ATOMA dashboards: Overview and Site, for the Petrolyst app
 
-**Status (29 Oct 2026, PD-13): two dashboards, `atoma-overview` and `atoma-site` (§10), built and
+**Status (30 Oct 2026, PD-21: every customer sees these two, limited by row; slugs `overview` and `site`, formerly
+`atoma-overview` and `atoma-site`, which the rest of this file still uses). Two dashboards (§10), built and
 tested on a local Superset; not imported live.** The Petrolyst app embeds them, and admins open
 them in Superset with the filter column.
 - `build_bundle.py` generates the dashboards, every dataset and every chart from this