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_write_path_design_arm.py

@@ -20,7 +20,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from scribe.services import plugin_context as pc
+from grimoire.services import plugin_context as pc
 from tests.helpers import writepath_cfg
 
 HOUSE = (
@@ -55,7 +55,7 @@ def _project(ds_id=9):
     ("frontend/src/styles/components.css", True),
     ("web/App.TSX", True),
     ("templates/index.html", True),
-    ("src/scribe/services/dedup.py", False),
+    ("src/grimoire/services/dedup.py", False),
     ("frontend/src/utils/deadWeight.ts", False),
     ("README.md", False),
     ("", False),