rename(547): the server is grimoire — package, image, DB defaults, backups

Step 2 of the Scribe -> Grimoire rename.

- src/scribe -> src/grimoire, and every import, patch target, module path,
  hypercorn entry point and `python -m grimoire.restore` with it; pyproject,
  uv.lock and the frontend package are named grimoire.
- Image git.fabledsword.com/bvandeusen/fabledgrimoire; CI's Postgres service
  runs as grimoire / grimoire_test.
- Compose files default the DB user, database and (prod) volume to grimoire,
  each overridable from .env, so an install created as Scribe keeps its data
  by setting POSTGRES_USER, POSTGRES_DB and PGDATA_VOLUME.
- Backups are written as grimoire-<ts>.tar with format grimoire-backup-tar.
  Archives named scribe-* with the scribe-backup-tar manifest still restore
  and are still counted at the destination (folder and S3), with tests.
- Exports, the MCP auth realm, the ASGI scope key and the persistent logger
  carry the new name.

Kept on purpose: the secret-sealing key label stays "scribe.secrets.v1",
because every stored secret was derived under it.

Plugin identity (plugin name, hooks, env vars, .scribe marker, skills) is
step 3.

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

docker-compose.quickstart.yml

@@ -5,11 +5,11 @@
 
 services:
   app:
-    image: git.fabledsword.com/bvandeusen/fabledscribe:latest
+    image: git.fabledsword.com/bvandeusen/fabledgrimoire:latest
     ports:
       - "5000:5000"
     environment:
-      DATABASE_URL: "postgresql+asyncpg://scribe:scribe@db:5432/scribe"
+      DATABASE_URL: "postgresql+asyncpg://${POSTGRES_USER:-grimoire}:${POSTGRES_PASSWORD:-grimoire}@db:5432/${POSTGRES_DB:-grimoire}"
       # Set SECRET_KEY in the environment or a .env file beside this one.
       SECRET_KEY: "${SECRET_KEY:-change-me-in-production}"
       LOG_LEVEL: "${LOG_LEVEL:-INFO}"
@@ -26,9 +26,9 @@ services:
     volumes:
       - pgdata:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: scribe
-      POSTGRES_PASSWORD: scribe
-      POSTGRES_DB: scribe
+      POSTGRES_USER: ${POSTGRES_USER:-grimoire}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-grimoire}
+      POSTGRES_DB: ${POSTGRES_DB:-grimoire}
     restart: unless-stopped
 
 volumes: