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_platforms.py

@@ -8,11 +8,11 @@ from __future__ import annotations
 
 from types import SimpleNamespace
 
-from scribe.mcp.server import _READ_ONLY_TOOLS, _WRITE_TOOLS
-from scribe.mcp.tools.projects import _inception_choices
-from scribe.services.coverage import scan_archive
+from grimoire.mcp.server import _READ_ONLY_TOOLS, _WRITE_TOOLS
+from grimoire.mcp.tools.projects import _inception_choices
+from grimoire.services.coverage import scan_archive
 from tests.helpers import forge_tarball
-from scribe.services.platforms import (
+from grimoire.services.platforms import (
     MEMBER_STATES, SETTABLE_STATES, detect, marker_matches, members,
     validate_markers, validate_updates,
 )