Adds client-side support for the new WOQL set operations implemented in TerminusDB.

New WOQL Methods

• set_difference(list_a, list_b, result) - Compute elements in A but not in B
• set_intersection(list_a, list_b, result) - Compute common elements
• set_union(list_a, list_b, result) - Compute combined elements (deduplicated)
• set_member(element, set) - Check membership in a set
• list_to_set(list, set) - Convert list to sorted set with duplicates removed

Files Changed

• terminusdb_client/woqlquery/woql_query.py - Added 5 new WOQL builder methods
• terminusdb_client/tests/integration_tests/test_woql_set_operations.py - Integration tests
• terminusdb_client/tests/integration_tests/conftest.py - Fixed local server detection
• CONTRIBUTING.md - Added venv setup instructions for contributors
• .gitignore - Added .venv/ directory

Usage Example

query = WOQLQuery().woql_and(
    WOQLQuery().eq("v:ListA", [1, 2, 3, 4]),
    WOQLQuery().eq("v:ListB", [2, 4]),
    WOQLQuery().set_difference("v:ListA", "v:ListB", "v:Diff")
)
# Result: Diff = [1, 3]

Testing

All 11 integration tests pass against the TerminusDB server with the corresponding set operations implementation.