* Improve ag-ui tests and coverage
* fix tests paths
* Fixes
* Improve AG-UI test robustness and correctness
- Map toolName → tool_call_name in SSE helpers for TOOL_CALL_START events
- Fail loudly on malformed SSE JSON in parse_sse_response() instead of silently dropping
- Detect duplicate TOOL_CALL_START/TOOL_CALL_END in assert_tool_calls_balanced()
- Remove fragile source line reference from test docstring
- Add found guard in test_client_tool_sets_additional_properties to prevent vacuous pass
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---------
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Evan Mattson