fix: isolate immutable session context tests (#714)

tests/test_operation_scoped_roles.py

@@ -16,7 +16,6 @@ sys.path.insert(0, str(__import__("pathlib").Path(__file__).resolve().parent.par
 import gitea_config
 import gitea_auth
 import mcp_server
-import session_context_binding as session_ctx
 from reviewer_worktree import assess_author_worktree_continuity
 
 CONFIG_TEST = {
@@ -68,7 +67,6 @@ class TestOperationScopedRoles(unittest.TestCase):
         mcp_server._IDENTITY_CACHE.clear()
         gitea_config._active_profile_override = None
         mcp_server._MUTATION_AUTHORITY = None
-        session_ctx.clear_session_context()
         self._dir = tempfile.TemporaryDirectory()
         self.config_path = os.path.join(self._dir.name, "profiles.json")
         self._write_config(CONFIG_TEST)
@@ -78,7 +76,6 @@ class TestOperationScopedRoles(unittest.TestCase):
         mcp_server._IDENTITY_CACHE.clear()
         gitea_config._active_profile_override = None
         mcp_server._MUTATION_AUTHORITY = None
-        session_ctx.clear_session_context()
         self._dir.cleanup()
 
     def _write_config(self, obj):