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_mcp_endpoint.py

@@ -15,7 +15,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from scribe.app import create_app
+from grimoire.app import create_app
 
 
 async def _send_request(
@@ -73,7 +73,7 @@ async def test_mcp_endpoint_unauthenticated_returns_401():
 async def test_mcp_endpoint_invalid_token_returns_401():
     app = create_app()
     with patch(
-        "scribe.mcp.auth.lookup_key",
+        "grimoire.mcp.auth.lookup_key",
         AsyncMock(return_value=None),
     ):
         status, _ = await _send_request(
@@ -107,7 +107,7 @@ async def test_mcp_endpoint_valid_token_passes_auth():
     }).encode()
     async with app.mcp_instance.session_manager.run():
         with patch(
-            "scribe.mcp.auth.lookup_key",
+            "grimoire.mcp.auth.lookup_key",
             AsyncMock(return_value=fake_key),
         ):
             status, _ = await _send_request(