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_version_pinning_prune.py

@@ -29,10 +29,10 @@ async def test_create_version_prune_sql_filters_to_unpinned():
     mock_session.execute = AsyncMock(side_effect=execute_capture)
 
     with patch(
-        "scribe.services.note_versions.async_session",
+        "grimoire.services.note_versions.async_session",
         return_value=mock_session,
     ):
-        from scribe.services.note_versions import create_version
+        from grimoire.services.note_versions import create_version
         await create_version(
             user_id=1, note_id=42, body="content", title="t", tags=["a"],
         )
@@ -62,10 +62,10 @@ async def test_prune_auto_pins_filters_to_auto_kind():
     mock_session.execute = AsyncMock(side_effect=execute_capture)
 
     with patch(
-        "scribe.services.version_pinning.async_session",
+        "grimoire.services.version_pinning.async_session",
         return_value=mock_session,
     ):
-        from scribe.services.version_pinning import (
+        from grimoire.services.version_pinning import (
             prune_auto_pins, MAX_AUTO_PINS,
         )
         await prune_auto_pins(user_id=1, note_id=42)