Add teaching Python agent CLI with Poetry and CI

tests/test_cli.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+from subprocess import run
+import sys
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_cli_lists_skills(tmp_path) -> None:
+    skill_dir = tmp_path / "skills" / "analysis"
+    skill_dir.mkdir(parents=True)
+    (skill_dir / "SKILL.md").write_text("# analysis", encoding="utf-8")
+
+    result = run(
+        [
+            sys.executable,
+            "-m",
+            "agt.cli",
+            "--skills-dir",
+            str(tmp_path / "skills"),
+            "--list-skills",
+        ],
+        cwd=ROOT,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+
+    assert result.returncode == 0
+    assert "analysis" in result.stdout