Retire the Superset reader setup and the ATOMA dashboard (PD-13)

ATOMA's users use the Petrolyst app; Superset keeps admins, editors and the
app's embedded dashboards. Removed: the "ATOMA Reader" role and its rules
(petrolyst_reader.py, ReaderAccessMixin, reader.css, the head template, the
SQL-hiding patch), the atoma-reader mapping (it now maps to nothing in
Superset), the iframe allowance for the Map tab, and the "atoma" dashboard
with its Fleet/Map tab, D0 and dashboard.css. The bundle holds atoma-overview
and atoma-site only (byte-identical to before); the guest role keeps the
reader's 12 permissions in roles/atoma_guest.py. Brand files now name
petrolyst-web. SPEC marks the retired parts as history.

Checks (local): bundle checks pass; image rebuilt and healthy; import with
column drift 0 and unchanged embedding ids; the production config loads with
OAuth, embedding off, no reader hook; admin sees atoma-site with its tabs and
filter column; the app's browser tests pass 10/10. shellcheck not run (not
installed). Not deployed.

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

petrolyst-insights/patches/README.md

@@ -1,10 +1,7 @@
 # patches/
 
 Runtime patches applied while the Superset image is built
-(`stacks/fuel-monitoring/superset/Dockerfile`):
-
-- `fix_redact_query_for_readers.py`: chart-data responses carry no SQL for readers, as Superset
-  already does for embedded guests (`petrolyst_reader.py`).
+(`stacks/fuel-monitoring/superset/Dockerfile`). Empty until Petrolyst needs one.
 
 Same convention as media-insights: