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_lesson_kind.py

@@ -26,9 +26,9 @@ and goes red the day one is added without this value.
 """
 from types import SimpleNamespace
 
-from scribe.services import knowledge as knowledge_svc
-from scribe.services import lessons as lessons_svc
-from scribe.services.embeddings import trigger_title
+from grimoire.services import knowledge as knowledge_svc
+from grimoire.services import lessons as lessons_svc
+from grimoire.services.embeddings import trigger_title
 
 
 def _note(data=None, body=""):
@@ -76,7 +76,7 @@ def test_one_join_builds_every_trigger_title():
     assert trigger_title(subject, trigger) == expected
     # The two note kinds reach it through the EMBEDDED title,
     # from their own mirror key — never a hand-rolled join.
-    from scribe.services.embeddings import document_title
+    from grimoire.services.embeddings import document_title
     assert document_title(subject, "lesson", {"when_to_apply": trigger}) == expected
     assert document_title(subject, "snippet", {"when_to_use": trigger}) == expected
 
@@ -107,7 +107,7 @@ def test_the_global_kinds_list_names_the_lesson_and_nothing_else():
     here instead — the one thing a literal costs is that it can drift, and
     this is what stops it.
     """
-    from scribe.services.embeddings import GLOBAL_NOTE_TYPES
+    from grimoire.services.embeddings import GLOBAL_NOTE_TYPES
 
     assert GLOBAL_NOTE_TYPES == (lessons_svc.LESSON_NOTE_TYPE,)