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_ledger_references_not_silence.py

@@ -67,7 +67,7 @@ def _snippet_item(nid, title, user_id=1):
 # ── auto-inject ────────────────────────────────────────────────────────────
 
 async def _autoinject(hits, exclude_ids, *, rec=None, surf=None):
-    from scribe.services import plugin_context as pc
+    from grimoire.services import plugin_context as pc
     search = AsyncMock(return_value=hits)
     with patch.object(pc, "get_autoinject_config", AsyncMock(
             return_value={"enabled": True, "threshold": 0.55, "top_k": 3})), \
@@ -167,7 +167,7 @@ async def test_the_header_explains_the_seen_marker():
 # ── the write path ─────────────────────────────────────────────────────────
 
 async def _write_path(hits, exclude_ids, *, here=(), rec=None, sync_exclude=()):
-    from scribe.services import plugin_context as pc
+    from grimoire.services import plugin_context as pc
     search = AsyncMock(return_value=hits)
     listing = AsyncMock(side_effect=[(list(here), len(here)), ([], 0)])
     with patch.object(pc, "get_writepath_config", AsyncMock(return_value=_wp_cfg())), \