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>

src/grimoire/utils/tags.py

@@ -0,0 +1,11 @@
+import re
+
+_CODE_FENCE_RE = re.compile(r"```[\s\S]*?```|`[^`\n]+`")
+_TAG_RE = re.compile(r"(?<!\w)#([\w][\w-]*(?:/[\w][\w-]*)*)")
+
+
+def extract_tags(body: str) -> list[str]:
+    """Extract #tags from body text, ignoring code blocks."""
+    cleaned = _CODE_FENCE_RE.sub("", body)
+    tags = _TAG_RE.findall(cleaned)
+    return sorted(set(tags))