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_shape_form_gate.py

@@ -24,7 +24,7 @@ from __future__ import annotations
 
 import pytest
 
-from scribe.services.shape_ledger import (
+from grimoire.services.shape_ledger import (
     FORM_UNKNOWN, canon_form, comparable_siblings, dominant_canon,
     families_conflict, forms_agree, shape_family, shape_form, signature_in,
 )
@@ -281,7 +281,7 @@ def test_a_near_name_is_not_matched() -> None:
 # in the file, which is precisely how a class, an async method and a private
 # helper were all recorded as instances of one snippet.
 
-from scribe.services.shape_ledger import _stamp_allowed, forms_conflict  # noqa: E402
+from grimoire.services.shape_ledger import _stamp_allowed, forms_conflict  # noqa: E402
 
 
 @pytest.mark.parametrize("a,b,want", [
@@ -326,7 +326,7 @@ def test_one_canon_is_not_stamped_onto_a_whole_file() -> None:
 def test_the_resemblance_floor_is_above_the_retrieval_floors() -> None:
     """An unattended WRITE about the codebase should need more evidence than
     a suggestion shown to a reader — the retrieval bars sit near 0.70."""
-    from scribe.services.shape_ledger import _RESEMBLE_MIN
+    from grimoire.services.shape_ledger import _RESEMBLE_MIN
 
     assert _RESEMBLE_MIN >= 0.80