Update check_green.py

Author: BryceWDesign

check_green.py

@@ -120,13 +120,23 @@ def _build_and_validate_wheel() -> None:
                 "from pathlib import Path",
                 "import os",
                 "import cyphersyntax",
-                "from cyphersyntax.handshake import HandshakeConfirmation, HandshakeOffer, HandshakeResponse",
-                "from cyphersyntax.identity import Identity",
-                "from cyphersyntax.session import AeadSuite, SessionFactory",
+                "from cyphersyntax import (",
+                "    AeadSuite,",
+                "    HandshakeConfirmation,",
+                "    HandshakeOffer,",
+                "    HandshakeResponse,",
+                "    Identity,",
+                "    SessionFactory,",
+                ")",
                 "install_root = Path(os.environ['CYPHERSYNTAX_INSTALL_ROOT']).resolve()",
                 "module_path = Path(cyphersyntax.__file__).resolve()",
                 "if install_root not in module_path.parents:",
                 "    raise RuntimeError(f'package imported outside isolated target: {module_path}')",
+                "marker_path = module_path.with_name('py.typed')",
+                "if not marker_path.is_file():",
+                "    raise RuntimeError('installed wheel is missing the PEP 561 marker')",
+                "if cyphersyntax.__version__ != '0.1.0':",
+                "    raise RuntimeError('installed wheel reports an unexpected version')",
                 "alice = Identity.generate('alice')",
                 "bob = Identity.generate('bob')",
                 "pending_alice = SessionFactory.initiator(",