Move unit tests from tests/ to tests/unit/ for clearer separation
from integration tests. Update pyproject.toml testpaths and Makefile
test target to reflect the new structure.
- Replace Starlette routing with direct ASGI dispatcher to avoid
double-response issues with SSE transport
- Simplify integration test fixtures by removing async client fixture
- Consolidate integration tests into single test functions per file
to prevent SSE connection cleanup issues between tests
- Fix add_records assertion to expect 'inserted_ids' (actual API response)
- Server now authenticates from GRIST_MCP_TOKEN env var or token parameter
- Removed unused code (_set_agent, nonlocal check)
- Added AuthError handling in main.py
- Updated test to pass token explicitly
