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_snippet_notes.py

@@ -22,7 +22,7 @@ import pytest_asyncio
 
 from tests.helpers import ensure_user
 
-from scribe.services import snippets as s
+from grimoire.services import snippets as s
 
 CODE = "def helper():\n    return 1"
 NOTES = "Shaped this way because the caller owns the session.\n\nSuperseded #12."
@@ -72,7 +72,7 @@ def test_notes_after_code_that_itself_contains_the_heading():
 def test_long_notes_are_chunked_apart_from_the_code():
     """The heading is the chunker's split point, so a long explanation gets
     vectors of its own instead of averaging into the code's."""
-    from scribe.services.embeddings import chunk_document
+    from grimoire.services.embeddings import chunk_document
 
     long_notes = "\n\n".join(["An explanatory paragraph about the history. " * 12] * 4)
     body = s.compose_body(code=CODE, language="python", when_to_use="a helper",
@@ -107,7 +107,7 @@ def test_a_headed_or_multi_paragraph_trigger_is_advised_even_when_short():
 
 @pytest_asyncio.fixture
 async def user_id(_dispose_engine):
-    from scribe.models import async_session
+    from grimoire.models import async_session
 
     async with async_session() as session:
         uid = (await ensure_user(session, "snippet_notes_itest")).id