feat: add CLI with build and run commands

tests/test_cli.py

@@ -0,0 +1,42 @@
+"""Test CLI functionality."""
+
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+
+def test_build_command():
+    """Test build command."""
+    result = subprocess.run(
+        [sys.executable, "-m", "tampy", "build", "test.tampy"],
+        capture_output=True,
+        text=True,
+        env={**dict(os.environ), "PYTHONPATH": "src"}
+    )
+    assert result.returncode == 0
+    assert "Generated:" in result.stdout
+
+
+def test_run_command():
+    """Test run command."""
+    result = subprocess.run(
+        [sys.executable, "-m", "tampy", "run", "test.tampy"],
+        capture_output=True,
+        text=True,
+        env={**dict(os.environ), "PYTHONPATH": "src"}
+    )
+    assert result.returncode == 0
+    assert "y is greater" in result.stdout
+
+
+def test_file_extension_replacement():
+    """Test that .tampy is replaced with .py."""
+    result = subprocess.run(
+        [sys.executable, "-m", "tampy", "build", "test.tampy"],
+        capture_output=True,
+        text=True,
+        env={**dict(os.environ), "PYTHONPATH": "src"}
+    )
+    assert result.returncode == 0
+    assert Path("test.py").exists()