refactor: split flat core into capability packages, layer the conversations service, English defaults for every model-facing text

tests/test_redact.py

@@ -5,8 +5,8 @@ import logging
 
 import pytest
 
-from beaver_gateway.core import redact as redact_mod
-from beaver_gateway.core.redact import (
+from beaver_gateway.security import redact as redact_mod
+from beaver_gateway.security.redact import (
     RedactFilter,
     RedactingFormatter,
     env_secrets,