test: hard-fail the suite when the tenant resolves to production

Session-scoped autouse guard in tests/conftest.py refuses to run any
test (pytest.exit, returncode 1) when the effective tenant resolves
to the production tenant jpmschweitzer - the same guard library-desk
applies on its side. _initialize_app now depends on the guard so the
refusal happens before any initialization.

Suite-level assertions pin that the live session runs under the
llm_tester namespaces: Qdrant memories_llm_tester collection and
Redis session:llm_tester:* keys. The biographer/memory unit tests
already run fully mocked (no shared-service writes); the e2e
isolation tests already used llm_tester - their constants now derive
from the shared TEST_TENANT/PRODUCTION_TENANT config constants so a
drift fails loudly instead of silently splitting.

Verified: ENVIRONMENT=production pytest run exits 1 with the TENANT
GUARD message and zero tests executed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/e2e/test_orchestration_e2e.py

@@ -26,12 +26,18 @@ from typing import AsyncGenerator
 from dataclasses import dataclass
 
 
+from src.core.config import PRODUCTION_TENANT, TEST_TENANT
+
 # Test configuration
 BASE_URL = "http://localhost:8777"
 QDRANT_URL = "http://localhost:6333"
 API_TIMEOUT = 120.0  # LLM calls can be slow
-TEST_USER = "llm_tester"
+# All e2e writes to shared services go to the reserved test tenant's
+# namespaces (Qdrant memories_llm_tester, wiki llm_tester scope) - never
+# the production tenant's.
+TEST_USER = TEST_TENANT
 TEST_COLLECTION = f"memories_{TEST_USER}"
+assert TEST_USER != PRODUCTION_TENANT
 
 
 @dataclass
@@ -986,7 +992,7 @@ class TestUserContextIsolation:
         in_test_collection = any(unique_value in v for v in test_values)
 
         # Check production collection (should NOT be there)
-        prod_collection = "memories_jpmschweitzer"
+        prod_collection = f"memories_{PRODUCTION_TENANT}"
         if await qdrant.collection_exists(prod_collection):
             prod_points = await qdrant.scroll_points(prod_collection)
             prod_values = [str(p.get("payload", {})) for p in prod_points]