Add Memory Gateway agent plugin

plugins/memory-gateway-agent/tests/test_hermes_register_hooks.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from test_hermes_register_tools import FakeHermesContext, load_plugin_module
+
+
+def test_register_registers_expected_hooks():
+    module = load_plugin_module()
+    ctx = FakeHermesContext()
+
+    module.register(ctx)
+
+    assert [item[0] for item in ctx.registered_hooks] == [
+        "on_session_start",
+        "pre_llm_call",
+        "post_llm_call",
+        "on_session_end",
+    ]
+    assert all(callable(item[1]) for item in ctx.registered_hooks)
+
+
+def test_hook_callbacks_accept_kwargs():
+    module = load_plugin_module()
+
+    assert isinstance(module.on_session_start(session_id="s", extra="x"), dict)
+    assert isinstance(module.pre_llm_call(user_message="", session_id="s", extra="x"), dict)
+    assert module.post_llm_call(user_message="hi", assistant_response="hello", extra="x") is None
+    assert module.on_session_end(session_id="s", extra="x") is None
+