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_rule_soft_links.py

@@ -12,7 +12,7 @@ from __future__ import annotations
 import inspect
 from datetime import datetime, timedelta, timezone
 
-from scribe.services import lesson_rules as links_svc
+from grimoire.services import lesson_rules as links_svc
 
 NOW = datetime(2026, 10, 1, 12, 0, tzinfo=timezone.utc)
 
@@ -26,7 +26,7 @@ def test_the_same_ask_reworded_trivially_is_one_situation():
 def test_a_file_is_one_situation_however_its_code_differs():
     """The write arm keys on the path, so a run of edits to one file — each
     with different code — is one situation, not one per edit."""
-    path = "src/scribe/services/lesson_rules.py"
+    path = "src/grimoire/services/lesson_rules.py"
     assert links_svc.situation_key("w", path) == links_svc.situation_key("w", path)
     assert links_svc.situation_key("w", path) != links_svc.situation_key("w", "src/other.py")
 
@@ -94,8 +94,8 @@ def test_both_hook_doors_count_the_pair_on_their_own_arm():
     """The two responses that carry lessons and rules together. A door that
     renders both and does not record the pair is the miss this step exists
     to close, and it would produce no error anywhere — only an empty table."""
-    from scribe.routes import plugin as plugin_routes
-    from scribe.services import plugin_context
+    from grimoire.routes import plugin as plugin_routes
+    from grimoire.services import plugin_context
 
     prompt_door = inspect.getsource(plugin_routes.autoinject_retrieve)
     assert "co_surfaced(" in prompt_door and 'arm="p"' in prompt_door