feat: add setup_tls_status() and --status flag to setup-tls subcommand

- Added setup_tls_status() function to display current TLS configuration status
- Shows cert path, key path, hostnames, expiry, and status when configured
- Shows 'not configured' prompt when TLS is not set up
- Shows 'configured but cert not readable' when cert exists in settings but file isn't accessible
- Added --status flag to setup-tls argparse subparser
- Updated main() dispatch to call setup_tls_status() when --status flag is passed
- Added 4 new tests covering all scenarios

All 95 tests pass.

muxplex/cli.py

@@ -816,6 +816,41 @@ def setup_tls(method: str = "auto") -> None:
     print("  Restart service to apply: muxplex service restart")
 
 
+def setup_tls_status() -> None:
+    """Display the current TLS configuration status."""
+    from muxplex.settings import load_settings  # noqa: PLC0415
+    from muxplex.tls import get_cert_info  # noqa: PLC0415
+
+    settings = load_settings()
+    tls_cert = settings.get("tls_cert", "")
+    tls_key = settings.get("tls_key", "")
+
+    print("muxplex TLS status")
+    print()
+
+    if not tls_cert or not tls_key:
+        print("  TLS: not configured")
+        print("  Run: muxplex setup-tls")
+        return
+
+    print(f"  Certificate: {tls_cert}")
+    print(f"  Key:         {tls_key}")
+
+    cert_info = get_cert_info(tls_cert)
+    if cert_info is None:
+        print("  Status: configured but cert not readable")
+        return
+
+    hostnames_str = ", ".join(cert_info["hostnames"])
+    expires = cert_info["expires"]
+    expiry_str = (
+        expires.strftime("%Y-%m-%d") if hasattr(expires, "strftime") else str(expires)
+    )
+    print(f"  Hostnames:   {hostnames_str}")
+    print(f"  Expires:     {expiry_str}")
+    print("  Status: enabled")
+
+
 def _add_serve_flags(parser: argparse.ArgumentParser) -> None:
     """Add --host, --port, --auth, --session-ttl, --tls-cert, --tls-key flags to a parser.
 
@@ -918,6 +953,11 @@ def main() -> None:
         default="auto",
         help="Certificate generation method (default: auto)",
     )
+    setup_tls_parser.add_argument(
+        "--status",
+        action="store_true",
+        help="Show current TLS configuration status",
+    )
 
     config_parser = sub.add_parser("config", help="View and manage settings")
     config_sub = config_parser.add_subparsers(dest="config_command")
@@ -956,6 +996,9 @@ def main() -> None:
             # Default: list (no subcommand or explicit "list")
             config_list()
     elif args.command == "setup-tls":
+        if args.status:
+            setup_tls_status()
+        else:
             setup_tls(method=args.method)
     elif args.command == "service":
         from muxplex.service import (  # noqa: PLC0415

muxplex/tests/test_cli.py

@@ -1785,6 +1785,101 @@ def test_setup_tls_auto_falls_to_selfsigned_when_nothing_available(
     )
 
 
+# ---------------------------------------------------------------------------
+# task-5-status-display: setup-tls --status tests
+# ---------------------------------------------------------------------------
+
+
+def test_setup_tls_status_shows_disabled(tmp_path, monkeypatch, capsys):
+    """setup_tls_status() shows 'not configured' when no TLS certs are configured."""
+    import muxplex.settings as settings_mod
+
+    # Empty settings — no tls_cert or tls_key
+    settings_file = tmp_path / "settings.json"
+    settings_file.write_text("{}")
+    monkeypatch.setattr(settings_mod, "SETTINGS_PATH", settings_file)
+
+    from muxplex.cli import setup_tls_status
+
+    setup_tls_status()
+
+    out = capsys.readouterr().out
+    out_lower = out.lower()
+    assert "not configured" in out_lower or "disabled" in out_lower, (
+        f"Expected 'not configured' or 'disabled' in output, got: {out!r}"
+    )
+
+
+def test_setup_tls_status_shows_enabled(tmp_path, monkeypatch, capsys):
+    """setup_tls_status() shows 'enabled' and 'expires' when valid certs are configured."""
+    import json
+
+    import muxplex.settings as settings_mod
+    from muxplex.tls import generate_self_signed
+
+    # Generate real self-signed certs in tmp_path
+    cert_path = tmp_path / "muxplex.crt"
+    key_path = tmp_path / "muxplex.key"
+    generate_self_signed(cert_path, key_path)
+
+    settings_file = tmp_path / "settings.json"
+    settings_file.write_text(
+        json.dumps({"tls_cert": str(cert_path), "tls_key": str(key_path)})
+    )
+    monkeypatch.setattr(settings_mod, "SETTINGS_PATH", settings_file)
+
+    from muxplex.cli import setup_tls_status
+
+    setup_tls_status()
+
+    out = capsys.readouterr().out
+    out_lower = out.lower()
+    assert "enabled" in out_lower or "certificate" in out_lower, (
+        f"Expected 'enabled' or 'certificate' in output, got: {out!r}"
+    )
+    assert "expires" in out_lower, f"Expected 'expires' in output, got: {out!r}"
+
+
+def test_setup_tls_status_flag_registered():
+    """setup-tls --status must be accepted by argparse."""
+    import io
+
+    from muxplex.cli import main
+
+    buf = io.StringIO()
+    with patch("sys.argv", ["muxplex", "setup-tls", "--help"]):
+        try:
+            with patch("sys.stdout", buf):
+                main()
+        except SystemExit:
+            pass
+
+    help_text = buf.getvalue()
+    assert "--status" in help_text, (
+        f"Expected '--status' in setup-tls --help output, got:\n{help_text}"
+    )
+
+
+def test_main_dispatches_status_flag_to_setup_tls_status(monkeypatch):
+    """main() with 'setup-tls --status' must invoke setup_tls_status(), not setup_tls()."""
+    import muxplex.cli as cli_mod
+
+    status_calls = []
+    setup_calls = []
+    monkeypatch.setattr(cli_mod, "setup_tls_status", lambda: status_calls.append(True))
+    monkeypatch.setattr(
+        cli_mod, "setup_tls", lambda method="auto": setup_calls.append(method)
+    )
+
+    with patch("sys.argv", ["muxplex", "setup-tls", "--status"]):
+        cli_mod.main()
+
+    assert len(status_calls) == 1, (
+        "setup_tls_status() must be called once for 'setup-tls --status'"
+    )
+    assert len(setup_calls) == 0, "setup_tls() must NOT be called when --status is used"
+
+
 def test_setup_tls_method_choices_expanded():
     """setup-tls --help must show 'tailscale' and 'mkcert' as method choices."""
     import io