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>

AGENTS.md

@@ -15,6 +15,8 @@ keep the rules there; a change against a rule or an open conflict goes to the ow
 - `keycloak/`: the `petrolyst` client import.
 
 ## Rules
+- **Commit messages** end their body with the bands and rules touched, for example
+  `Bands: 4 (server). Rules: 2, 3.`, or `Bands: none (docs).` for text only (architecture rule 1).
 - **Deploys:** only by README "Manual deploy", only when the owner asks. There is no CI. Commit on
   `main` first; never push or deploy unprompted.
 - **No secrets** in the repository; `deploy/deploy.sh` refuses if one appears.