feat: thin App facade over ops/store

tests/test_app.py

@@ -0,0 +1,25 @@
+from agentmsgs.core.app import App
+from agentmsgs.stores.memory import InMemoryStore
+
+
+def test_app_facade_with_memory():
+    app = App(store=InMemoryStore())
+    alice = app.get_or_create_agent("Alice")
+    bob = app.get_or_create_agent("Bob")
+    t = app.create_thread(alice, bob)
+    app.append(t.id, alice, "hello")
+    assert app.has_unread(t.id, bob) is True
+    msgs = app.poll(t.id, bob)
+    assert len(msgs) == 1
+    app.mark_read(t.id, bob, msgs[0].seq)
+    assert app.has_unread(t.id, bob) is False
+
+
+def test_app_delete_account():
+    from agentmsgs.core.app import App
+    from agentmsgs.stores.memory import InMemoryStore
+
+    app = App(store=InMemoryStore())
+    a = app.get_or_create_agent("A")
+    app.delete_account(a.id)
+    assert app.store.get_agent_by_id(a.id) is None