Removing mxpic_forge from the dependncy

backend/router_dependency.py

@@ -60,18 +60,18 @@ def require_router_stack(require_gdstk: bool = False) -> RouterStackStatus:
 
     try:
         router_builder = importlib.import_module("mxpic_router.builder")
-        route_factory = getattr(router_builder, "_import_mxpic_forge_route")
-        route_factory()
-        checked.append("mxpic_forge Route")
+        route_factory = getattr(router_builder, "_import_route_backend")
+        route_backend = route_factory()
+        checked.append(getattr(route_backend, "backend_name", "route backend"))
     except Exception as exc:
-        missing.append(f"mxpic_forge Route: {exc}")
+        missing.append(f"route backend: {exc}")
 
     if missing:
         details = "; ".join(missing)
         raise RouterStackUnavailable(
             "Required mxpic_router runtime stack is unavailable. "
-            "Build actions require the matched mxpic_router and mxpic_forge checkouts, "
-            f"Nazca, and gdstk for SVG preview generation. Details: {details}"
+            "Build actions require mxpic_router, Nazca, and either mxpic_forge Route "
+            f"or the Nazca Interconnect fallback. gdstk is also required for SVG preview generation. Details: {details}"
         )
 
     return RouterStackStatus(ok=True, router_root=router_root, checked=checked)