Add smoke test script in Python (#11628)

I wanted to consolidate these anyway, and apparently it's a huge pain to
make a Windows task fail early via GitHub's PowerShell setup so I
implement this in Python instead.

scripts/smoke-test/__main__.py

@@ -0,0 +1,60 @@
+import os
+import pathlib
+import shlex
+import subprocess
+import sys
+
+SELF_FILE = pathlib.Path(__file__)
+COMMANDS_FILE = SELF_FILE.parent / "commands.sh"
+
+
+def read_commands() -> list[list[str]]:
+    return [
+        shlex.split(line)
+        for line in COMMANDS_FILE.read_text().splitlines()
+        # Skip empty lines and comments
+        if line.strip() and not line.strip().startswith("#")
+    ]
+
+
+def run_command(command: list[str]) -> subprocess.CompletedProcess:
+    env = os.environ.copy()
+    # Prepend either the parent uv path to the PATH or the current directory
+    env = {
+        **env,
+        "PATH": str(
+            pathlib.Path(env.get("UV")).parent if "UV" in env else pathlib.Path.cwd()
+        )
+        + os.pathsep
+        + env.get("PATH"),
+    }
+    return subprocess.run(command, capture_output=True, text=True, env=env)
+
+
+def report_result(result: subprocess.CompletedProcess):
+    print("=============================================")
+    print(f"command: {' '.join(result.args)}")
+    print(f"exit code: {result.returncode}")
+    print()
+    print("------- stdout -------")
+    print(result.stdout)
+    print()
+    print("------- stderr -------")
+    print(result.stderr)
+
+
+def main():
+    results = [run_command(command) for command in read_commands()]
+    failed = sum(result.returncode != 0 for result in results)
+    for result in results:
+        report_result(result)
+
+    print("=============================================")
+    if failed:
+        print(f"FAILURE - {failed}/{len(results)} commands failed")
+        sys.exit(1)
+    else:
+        print(f"SUCCESS - {len(results)}/{len(results)} commands succeeded")
+
+
+main()

scripts/smoke-test/commands.sh

@@ -0,0 +1,17 @@
+# NOTE this is not a real shell-script, it's parsed by `smoke-test/__main__.py` and executed
+# serially via Python for cross-platform support.
+
+# Use any Python 3.13 version
+uv python pin 3.13
+
+# Create a virtual environment and install a package with `uv pip`
+uv venv -v
+uv pip install ruff -v
+
+# Install a package with extension modules, e.g., `numpy` and make sure it's importable
+uv pip install numpy -v
+uv run python -c "import numpy; print(numpy.__version__)"
+
+# Run a package via `uvx`
+uvx -v ruff --version
+