Artifacts-backed persistence for Agent “Self” tools (Notes / Todo) + streaming artifact_id support (#2267)

* (feat:memory) use fs/storage for files

* (feat:todo) artifact_id via sse

* (feat:notes) artifact id return

* (feat:artifact) add get endpoint, store todos with conv id

* (feat: artifacts) fe integration

* feat(artifacts): ui enhancements, notes as mkdwn

* chore(artifacts) updated artifact tests

* (feat:todo_tool) return all todo items

* (feat:tools) use specific tool names in bubble

* feat: add conversationId prop to artifact components in Conversation

* Revert "(feat:memory) use fs/storage for files"

This reverts commit d1ce3bea31.

* (fix:fe) build fail

tests/conftest.py

@@ -191,3 +191,11 @@ def mock_tool_manager(mock_tool, monkeypatch):
         "application.agents.base.ToolManager", Mock(return_value=manager)
     )
     return manager
+
+
+@pytest.fixture
+def flask_app():
+    from flask import Flask
+
+    app = Flask(__name__)
+    return app