feat: structural hardening, grid fast-paths, and state-aware adaptive snap recovery

tests/conftest.py

@@ -14,6 +14,10 @@ import sys
 import pytest
 
 
+def pytest_addoption(parser):
+    parser.addoption("--live", action="store_true", default=False, help="Run live tests")
+
+
 @pytest.fixture(autouse=True)
 def _isolate_config_from_argparse(monkeypatch):
     """Prevent Config() from reading sys.argv during tests.