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_snippet_provenance.py

@@ -26,7 +26,7 @@ import pytest_asyncio
 
 from tests.helpers import ensure_user
 
-from scribe.services.snippets import (
+from grimoire.services.snippets import (
     VERIFY_CHANGED,
     VERIFY_OK,
     compose_data,
@@ -84,7 +84,7 @@ def test_verification_records_and_reads_back_the_checked_commit():
 
 @pytest_asyncio.fixture
 async def user_id(_dispose_engine):
-    from scribe.models import async_session
+    from grimoire.models import async_session
 
     async with async_session() as s:
         uid = (await ensure_user(s, "snippet_prov_itest")).id
@@ -93,14 +93,14 @@ async def user_id(_dispose_engine):
 
 
 async def _fresh(uid, note_id):
-    from scribe.services import snippets as svc
+    from grimoire.services import snippets as svc
     note = await svc.get_snippet(uid, note_id)
     return snippet_fields(note), svc.snippet_to_dict(note)
 
 
 @pytest.mark.integration
 async def test_provenance_lives_and_dies_with_the_code_end_to_end(user_id):
-    from scribe.services import snippets as svc
+    from grimoire.services import snippets as svc
 
     note = await svc.create_snippet(
         user_id, name="prov_helper", code="def prov_helper():\n    return 1\n",
@@ -136,7 +136,7 @@ async def test_provenance_lives_and_dies_with_the_code_end_to_end(user_id):
 
 @pytest.mark.integration
 async def test_verification_stamps_the_commit_and_ok_refreshes_provenance(user_id):
-    from scribe.services import snippets as svc
+    from grimoire.services import snippets as svc
 
     note = await svc.create_snippet(
         user_id, name="prov_verify", code="def prov_verify():\n    return 1\n",