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_retrieval_registry.py

@@ -27,10 +27,10 @@ from __future__ import annotations
 import ast
 from pathlib import Path
 
-from scribe.services.retrieval_registry import (
+from grimoire.services.retrieval_registry import (
     ASKED, FAN_OUT_SITES, POINTS, UNBIDDEN,
 )
-from scribe.services.retrieval_surfaces import SURFACES
+from grimoire.services.retrieval_surfaces import SURFACES
 
 SRC = Path(__file__).resolve().parents[1] / "src"
 
@@ -169,7 +169,7 @@ def test_a_quiet_point_says_why() -> None:
 
 
 def test_every_point_declares_a_known_kind() -> None:
-    from scribe.services.retrieval_registry import AMBIENT, PULL
+    from grimoire.services.retrieval_registry import AMBIENT, PULL
 
     for s, p in POINTS.items():
         assert p.kind in {UNBIDDEN, ASKED, AMBIENT, PULL}, (s, p.kind)