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_verification_guidance_survives.py

@@ -33,8 +33,8 @@ from tests.helpers import tool_doc as _doc
 # explain what a RESULT means, which is a different job — they are deliberately
 # not held to this.
 _WRITE_SURFACES = [
-    ("scribe.mcp.tools.notes", "create_note"),
-    ("scribe.mcp.tools.notes", "update_note"),
+    ("grimoire.mcp.tools.notes", "create_note"),
+    ("grimoire.mcp.tools.notes", "update_note"),
 ]
 
 
@@ -79,7 +79,7 @@ def test_expires_when_is_described_as_a_state_not_a_date():
     """The one field whose obvious reading is wrong. A date invents a staleness
     schedule nobody can justify; a constraint expires when the ground moves,
     which is a condition and not a time."""
-    doc = _doc("scribe.mcp.tools.notes", "create_note")
+    doc = _doc("grimoire.mcp.tools.notes", "create_note")
     assert "STATE" in doc, (
         "create_note no longer says expires_when is a STATE. Left to itself, "
         '"expires" reads as a date, and every check would get an arbitrary one.'