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>

tests/test_routes_db_maintenance.py

@@ -2,7 +2,7 @@
 
 
 def test_admin_handlers_callable():
-    from scribe.routes import admin as admin_routes
+    from grimoire.routes import admin as admin_routes
     for name in (
         "get_db_maintenance",
         "update_db_maintenance",
@@ -13,7 +13,7 @@ def test_admin_handlers_callable():
 
 
 def test_db_maintenance_routes_registered():
-    from scribe.app import create_app
+    from grimoire.app import create_app
     app = create_app()
     rules = {r.rule for r in app.url_map.iter_rules()}
     assert "/api/admin/db-maintenance" in rules
@@ -22,7 +22,7 @@ def test_db_maintenance_routes_registered():
 
 
 def test_scheduler_surface():
-    from scribe.services import db_maintenance_scheduler as sched
+    from grimoire.services import db_maintenance_scheduler as sched
     for fn in (
         "start_db_maintenance_scheduler",
         "stop_db_maintenance_scheduler",
@@ -34,7 +34,7 @@ def test_scheduler_surface():
 
 
 def test_service_surface_and_allowlist():
-    from scribe.services.db_maintenance import (
+    from grimoire.services.db_maintenance import (
         MAINTENANCE_TABLES,
         get_last_run,
         get_table_health,
@@ -50,5 +50,5 @@ def test_service_surface_and_allowlist():
 
 
 def test_set_admin_setting_exists():
-    from scribe.services.settings import set_admin_setting
+    from grimoire.services.settings import set_admin_setting
     assert callable(set_admin_setting)