refactor(agent/relay): fold relay_llm attempt scaffolding into _ManagedAttempt; dedupe runtime session/scope paths; drop dead relay_runtime module-level shims

agent/relay_tools.py

@@ -72,11 +72,7 @@ def execute(
             and relay_runtime._is_relay_wrapped_callback_error(exc, callback_error)
         ):
             raise callback_error
-        if (
-            isinstance(exc, Exception)
-            and callback_error is None
-            and "value" in raw_result
-        ):
+        if isinstance(exc, Exception) and callback_error is None and "value" in raw_result:
             logger.warning(
                 "NeMo Relay tool post-processing failed after dispatch success; "
                 "returning the Hermes tool result",

tests/hermes_cli/test_relay_shared_metrics_runtime.py

@@ -939,7 +939,7 @@ def test_execution_adapters_do_not_create_relay_host_without_a_consumer(
 
     assert result is tool_result
     assert observed_args is tool_args
-    assert relay_runtime.get_host(create=False) is None
+    assert relay_runtime.HOST_REGISTRY.for_profile(create=False) is None
     assert imports == []
 
 
@@ -958,7 +958,7 @@ def test_core_runtime_is_fail_open_without_a_published_binding(monkeypatch, capl
     monkeypatch.setattr(relay_runtime.importlib, "import_module", missing_relay)
 
     assert relay_runtime.get_runtime() is None
-    host = relay_runtime.get_host()
+    host = relay_runtime.HOST_REGISTRY.for_profile()
     assert isinstance(host, relay_runtime.NoopRelayRuntime)
     assert host.profile_key == relay_runtime.current_profile_key()
     assert "nemo_relay" in host.reason