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_services_access_visibility.py

@@ -15,7 +15,7 @@ Assertions compile each clause to SQL and inspect its shape.
 """
 import pytest
 
-from scribe.services.access import (
+from grimoire.services.access import (
     browsable_notes_clause,
     notes_visibility_clause,
     readable_notes_clause,
@@ -157,13 +157,13 @@ async def test_reaching_a_design_system_via_a_project_reads_but_never_writes(
 ):
     from unittest.mock import AsyncMock, patch
 
-    from scribe.services.access import (
+    from grimoire.services.access import (
         can_read_design_system,
         can_write_design_system,
     )
 
     with patch(
-        "scribe.services.access.get_design_system_permission",
+        "grimoire.services.access.get_design_system_permission",
         AsyncMock(return_value=permission),
     ):
         assert await can_read_design_system(1, 3) is readable