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>

stacks/fuel-monitoring/superset/Dockerfile

@@ -11,8 +11,7 @@ USER root
 RUN uv pip install --no-cache --python /app/.venv/bin/python \
       authlib==1.9.1 psycopg2-binary==2.9.13 "trino[sqlalchemy]==0.340.0"
 
-COPY --from=insights --chown=superset:superset superset_config.py petrolyst_security.py petrolyst_reader.py /app/pythonpath/
-COPY --from=insights --chown=superset:superset templates/ /app/pythonpath/templates/
+COPY --from=insights --chown=superset:superset superset_config.py petrolyst_security.py /app/pythonpath/
 COPY --from=insights --chown=superset:superset roles/ /app/petrolyst-roles/
 COPY --from=insights --chown=superset:superset assets/branding/ /app/superset/static/assets/branding/
 COPY --from=insights patches/ /app/patches/petrolyst/