Add Python smoke tests

tests/test_agents_smoke.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from pathlib import Path
+import py_compile
+
+import pytest
+
+
+ROOT = Path(__file__).resolve().parents[1]
+AGENTS_DIR = ROOT / "agents"
+AGENT_FILES = sorted(
+    path for path in AGENTS_DIR.glob("*.py") if path.name != "__init__.py"
+)
+AGENT_IDS = [path.name for path in AGENT_FILES]
+
+
+@pytest.mark.parametrize("agent_path", AGENT_FILES, ids=AGENT_IDS)
+def test_agent_scripts_compile(agent_path: Path) -> None:
+    _ = py_compile.compile(str(agent_path), doraise=True)
+
+
+def test_agent_scripts_exist() -> None:
+    assert AGENT_FILES, "expected at least one agent script"