test: add end-to-end integration tests for cognitive pipeline (NLU→KR→Inference→NLG)

Add 14 integration tests in tests/integration/test_cognitive_pipeline.py
covering:
- Single-query round-trip (NLU → KR write/read → NLG)
- Knowledge persistence within session (add/retract/query patterns)
- Context switching (discourse manager across multiple utterances)
- Inference chain (Socrates syllogism, two-hop reasoning via resolution)
- Full pipeline round-trip (NLU → KR → Inference → NLG)

All tests mock spaCy at the LexicalAnalyzerParser level so they run in CI
without optional native packages.  Add `standalone` marker to opt out of
the `requires_backend` auto-skip for in-process tests.

Co-authored-by: Steake <530040+Steake@users.noreply.github.com>

Author: Copilot

pytest.ini

@@ -33,6 +33,7 @@ markers =
     slow: Slow running tests
     requires_backend: Tests requiring running backend
     requires_frontend: Tests requiring running frontend
+    standalone: In-process tests that do not require external services
 
 # Asyncio configuration
 asyncio_mode = auto

tests/conftest.py

@@ -84,6 +84,9 @@ def pytest_configure(config):
     config.addinivalue_line(
         "markers", "requires_frontend: mark test as requiring running frontend"
     )
+    config.addinivalue_line(
+        "markers", "standalone: in-process tests that do not require external services"
+    )
 
 
 # Global fixtures for test environment
@@ -136,7 +139,9 @@ def test_config():
 def pytest_runtest_setup(item):
     """Set up individual test runs with conditional skipping."""
     # Skip backend tests if backend is not available
-    if "requires_backend" in [mark.name for mark in item.iter_markers()]:
+    # Tests marked ``standalone`` run in-process and never contact a server.
+    marker_names = [mark.name for mark in item.iter_markers()]
+    if "requires_backend" in marker_names and "standalone" not in marker_names:
         try:
             import requests
             response = requests.get("http://localhost:8000/health", timeout=2)

tests/integration/conftest.py

@@ -0,0 +1,8 @@
+"""
+Local conftest for ``tests/integration/``.
+
+The root conftest auto-tags every file under ``integration/`` with the
+``requires_backend`` marker.  The cognitive-pipeline integration tests
+exercise core subsystems **in-process** and never contact a running server,
+so they carry the ``standalone`` marker that suppresses the backend check.
+"""