Ship WARDEN-WP-0030: delegation register for every catalog lane

Every execution position is now explicit. Catalog entries carry
delegation.mode (permanent / native / interim) with intended owner and
blocker. warden route gaps lists the interim set. Promotion requires
the ownership question. Doctrine lives in AccessRouting.md; the
register was published to the named owner repos.

src/warden/routing/__init__.py

@@ -12,12 +12,13 @@ from warden.routing.catalog import (
     find_catalog_path,
     load_catalog,
 )
-from warden.routing.models import RouteEntry
+from warden.routing.models import Delegation, RouteEntry
 
 __all__ = [
     "Catalog",
     "CatalogError",
     "CatalogFreshness",
+    "Delegation",
     "RouteEntry",
     "find_catalog_path",
     "load_catalog",