feat(host-agent): add workspace application entrypoint

apps/device-host-agent/host_agent/__init__.py

@@ -0,0 +1,3 @@
+from host_agent.app import HostAgentApplication, create_application
+
+__all__ = ["HostAgentApplication", "create_application"]

apps/device-host-agent/host_agent/app.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass
+class HostAgentApplication:
+    """Process shell expanded by the Host Agent implementation tasks."""
+
+    def run(self) -> None:
+        return None
+
+
+def create_application() -> HostAgentApplication:
+    return HostAgentApplication()

apps/device-host-agent/host_agent/cli.py

@@ -0,0 +1,12 @@
+from __future__ import annotations
+
+import argparse
+from collections.abc import Sequence
+
+from host_agent.app import create_application
+
+
+def main(argv: Sequence[str] | None = None) -> None:
+    parser = argparse.ArgumentParser(description="Run the Device Host Agent")
+    parser.parse_args(argv)
+    create_application().run()