Trino out of the code; commit messages name bands and rules

The rename step in init.sh and the guard in deploy/lib.sh are gone. README's
procedure is now "Removing the old project"; it keeps the old names until it
has run on the server. Migrations stay here (open point 8), and their README
says so. AGENTS.md adds the commit-message rule. Not deployed: live still runs
Trino.

Bands: 4 (Superset), persistence (docs). Rules: 2.

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

petrolyst-insights/README.md

@@ -16,7 +16,7 @@ and where it runs lives in `stacks/`, `traefik/`, `deploy/` and `host/`.
 | `superset_config.py` | Keycloak sign-in, role mapping, proxy and cookie settings, Redis caches, theme and chart palettes | `/app/pythonpath/` |
 | `petrolyst_security.py` | `PetrolystSecurityManager`: user info and roles from the Keycloak ID token, `/login/` straight to Keycloak, `/logout/` through Keycloak | `/app/pythonpath/` |
 | `roles/` | `atoma_guest.py`: the role "ATOMA Guest" for the Petrolyst app's embedded dashboards, with exactly its permissions; run by hand (see "Embedding") | `/app/petrolyst-roles/` |
-| `assets/branding/` | logos (full colour and white): the wordmark alone for the navbar, and the stacked logo; favicons, app icons; ATOMA's logo, which the Petrolyst app shows in its map's corner (`PETROLYST_OPERATOR_LOGO`) | `/app/superset/static/assets/branding/`, served at `/static/assets/branding/…` |
+| `assets/branding/` | logos (full colour and white): the wordmark alone for the navbar, and the stacked logo; favicons, app icons; ATOMA's logo, which the Petrolyst app shows in its map's corner (the server reads this file itself: `PETROLYST_OPERATOR_LOGO_FILE`) | `/app/superset/static/assets/branding/`, served at `/static/assets/branding/…` |
 | `patches/` | runtime patches, `fix_*.py` with `--verify` (see its README); none at present | `/app/patches/petrolyst/`, applied during the build |
 | `dashboards/` | exported dashboards and import scripts (see its README) | not in the image |