- Add get-test-instance-id.sh for branch-based container isolation
- Add run-integration-tests.sh for full test lifecycle management
- Update integration tests to read service URLs from environment
variables (GRIST_MCP_URL, MOCK_GRIST_URL) with fallback defaults
- 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)
