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_convergence.py

@@ -13,10 +13,10 @@ from unittest.mock import AsyncMock, patch
 
 import pytest
 
-from scribe.mcp._context import _user_id_ctx
-from scribe.mcp.tools import lessons as lesson_tools
-from scribe.services import lesson_rules as links_svc
-from scribe.services import lessons as lessons_svc
+from grimoire.mcp._context import _user_id_ctx
+from grimoire.mcp.tools import lessons as lesson_tools
+from grimoire.services import lesson_rules as links_svc
+from grimoire.services import lessons as lessons_svc
 
 # Bound before conftest's autouse stub replaces the module attribute.
 _REAL = links_svc.convergence_for
@@ -122,7 +122,7 @@ def _search_over(sim=_sim):
 def _run(no_rule, sim=_sim):
     return (
         patch.object(lessons_svc, "get_lesson", AsyncMock(return_value=_NOTES[1])),
-        patch("scribe.services.embeddings.semantic_search_notes", _search_over(sim)),
+        patch("grimoire.services.embeddings.semantic_search_notes", _search_over(sim)),
         patch.object(links_svc, "_no_rule_ids",
                      AsyncMock(side_effect=lambda ids: {i for i in ids if i in no_rule})),
     )