IAM tech spec: Auth and access management current state and proposed

changes.

Workspace support:
- Support for separate workspaces
- Addition of workspace CLI support for test purposes
- Massive test update
- Remove many 'user' references in services - workspace now provides
  the same separation
- Update API

tests/unit/test_retrieval/test_structured_query.py

@@ -44,7 +44,6 @@ class TestStructuredQueryProcessor:
         # Arrange
         request = StructuredQueryRequest(
             question="Show me all customers from New York",
-            user="trustgraph", 
             collection="default"
         )
         
@@ -110,7 +109,6 @@ class TestStructuredQueryProcessor:
         assert isinstance(objects_call_args, RowsQueryRequest)
         assert objects_call_args.query == 'query { customers(where: {state: {eq: "NY"}}) { id name email } }'
         assert objects_call_args.variables == {"state": "NY"}
-        assert objects_call_args.user == "trustgraph"
         assert objects_call_args.collection == "default"
         
         # Verify response