SIENTIAPDE-1646

Update project configuration and dependencies

- Added .mypy_cache and .cursor to .gitignore.
- Changed asyncio_default_fixture_loop_scope and asyncio_default_test_loop_scope to "session" in pyproject.toml.
- Updated e2e testing dependencies in requirements-dev.txt, replacing fakeredis and mongomock with pytest-httpserver.
- Updated requirements.txt to use sientia_do instead of a specific git commit.
- Modified sonar-project.properties to remove a file from coverage exclusions.
- Enhanced E2E test fixtures in e2e/conftest.py for better container management.
- Cleaned up e2e test files related to CoreScouter and PIWebAPIScouter workflows.

e2e/README.md

@@ -0,0 +1,37 @@
+# Scouter end-to-end tests
+
+Production-faithful E2E tests for `Scouter`, `PIWebAPIScouter`, and `CoreScouter` against real backing services.
+
+## Requirements
+
+- Docker (for testcontainers: MongoDB, Redis, PostgreSQL)
+- Python 3.11+ with dev dependencies: `pip install -r requirements-dev.txt`
+
+## Run locally
+
+```bash
+pytest e2e/ --override-ini testpaths=e2e -m e2e -v
+```
+
+Stop on first failure:
+
+```bash
+pytest e2e/ --override-ini testpaths=e2e -m e2e -x
+```
+
+## Coverage (separate from unit tests)
+
+```bash
+COVERAGE_FILE=.coverage.e2e pytest e2e/ --override-ini testpaths=e2e -m e2e --cov=scouter --cov-branch
+coverage combine .coverage .coverage.e2e && coverage report
+```
+
+## Scenario catalog
+
+See [scenarios.md](scenarios.md) for numbered scenarios and how they map to `test_scenario_*` functions. Section `## 0` of that file lists the harness smoke tests in `test_harness_smoke.py` (infra liveness checks, not business scenarios).
+
+## Production code is not mocked
+
+E2E uses real testcontainers, an in-process PI Web API HTTP server, `WorkflowEnvironment.start_local()`, and production `Activities` wiring. The only stand-ins are `mock_logger` and the optional `notification_inserts` spy. If a scenario fails due to a production defect, it is marked `xfail(strict=True)` and tracked in `openspec/changes/standardize-and-complete-e2e-tests/notes.md` when applicable.
+
+Unit tests under `tests/` remain Docker-free and run with the default `pytest` invocation.