fix: use sys.executable instead of hardcoded python

[Krivoblotsky]

Summary

• run.py called subprocess with "python" hardcoded in three places (launch_app, get_tree, get_tree_screenshot)
• This breaks in virtualenvs where only the venv Python is activated, and on systems where python isn't in PATH (only python3)
• Replaced all three with sys.executable, which always refers to the interpreter that is actually running the process

Test plan

• get_tree("com.apple.TextEdit") works from inside a virtualenv
• get_tree_screenshot("com.apple.TextEdit") works from inside a virtualenv
• No regression when called from a plain system Python install

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates macapptree/run.py to invoke the current Python interpreter (via sys.executable) instead of hardcoding "python", improving compatibility with virtualenvs and systems where python is not on PATH.

Changes:

• Import sys and replace "python" with sys.executable in subprocess invocations.
• Update subprocess command construction in launch_app, get_tree, and get_tree_screenshot.

Comments suppressed due to low confidence (1)

macapptree/run.py:36

• subprocess.check_call() does not capture stderr/stdout, so e.stderr in this handler will always be None. If you want to print the failing command’s stderr, switch to subprocess.run(..., capture_output=True, text=True, check=True) (or pass stderr=subprocess.PIPE) and log e.stderr/e.stdout; otherwise log e / return code instead.

    command = [sys.executable, "-m", "macapptree.main", "-a", app_bundle, "--oa", tmp_file.name]
    if max_depth:
        command.extend(["--max-depth", str(max_depth)])
    try:
        subprocess.check_call(command)
        return json.load(tmp_file)
    except subprocess.CalledProcessError as e:
        print(f"Failed to extract app accessibility for {app_bundle}. Error: {e.stderr}")
        raise e

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