feat(tenancy): implement workspace isolation

tests/unit_tests/provider/test_mcp_remote_transport.py

@@ -12,7 +12,15 @@ import pytest
 from aiohttp import web
 from mcp import types as mcp_types
 
-from langbot.pkg.provider.tools.loaders.mcp import MCPToolCallTimeoutError, RuntimeMCPSession
+from langbot.pkg.api.http.context import ExecutionContext
+from langbot.pkg.provider.tools.loaders.mcp import RuntimeMCPSession
+
+
+TEST_EXECUTION_CONTEXT = ExecutionContext(
+    instance_uuid='instance-a',
+    workspace_uuid='workspace-a',
+    placement_generation=1,
+)
 
 
 class _TransportProbe:
@@ -163,6 +171,7 @@ def _session(
         },
         True,
         app,
+        TEST_EXECUTION_CONTEXT,
     )