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_calibration_stamp.py

@@ -28,9 +28,9 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from scribe.services import embeddings as emb
-from scribe.services import retrieval_tuning as rt
-from scribe.services.retrieval_surfaces import SURFACES, get_surface
+from grimoire.services import embeddings as emb
+from grimoire.services import retrieval_tuning as rt
+from grimoire.services.retrieval_surfaces import SURFACES, get_surface
 from tests.helpers import make_mock_session, tool_doc
 
 # Names for the thing that talks, as opposed to the thing that embeds. Any of
@@ -72,7 +72,7 @@ def test_no_chat_model_identifier_reaches_the_calibration_path():
     """
     import inspect
 
-    from scribe.services import retrieval_migration as rm
+    from grimoire.services import retrieval_migration as rm
 
     for label, obj in (
         ("calibration_stamp", emb.calibration_stamp),
@@ -183,7 +183,7 @@ def test_the_tool_says_nothing_auto_retunes():
     Without this, the obvious next move on seeing `stale: true` is to move the
     dial — which is tuning from a statistic, which can point the wrong way.
     """
-    doc = tool_doc("scribe.mcp.tools.retrieval_tuning", "retrieval_surfaces")
+    doc = tool_doc("grimoire.mcp.tools.retrieval_tuning", "retrieval_surfaces")
     assert "calibration" in doc
     assert "NOTHING IS RETUNED AUTOMATICALLY" in doc
     assert "unstamped" in doc