Abri relay credentials and defaults hydrate from environment configuration 🟥

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/infrastructure/abri/test_abri_config.py

@@ -0,0 +1,22 @@
+from infrastructure.abri.config import AbriConfig
+
+
+def test_config_hydrates_relay_credentials_and_defaults_from_environment() -> None:
+    # Arrange
+    env = {
+        "ABRI_RELAY_URL": "https://relay.example.test/api/DomnaRelay?code=key",
+        "ABRI_RELAY_USERNAME": "DomnaWeb",
+        "ABRI_RELAY_PASSWORD": "secret",
+        "ABRI_RELAY_DEFAULT_RESOURCE": "CBRYAN",
+    }
+
+    # Act
+    config = AbriConfig.from_env(env)
+
+    # Assert
+    assert config == AbriConfig(
+        endpoint_url="https://relay.example.test/api/DomnaRelay?code=key",
+        username="DomnaWeb",
+        password="secret",
+        default_resource="CBRYAN",
+    )